Merge tag 'stream_open-5.2' of https://lab.nexedi.com/kirr/linux

Pull stream_open conversion from Kirill Smelkov:

 - remove unnecessary double nonseekable_open from drivers/char/dtlk.c
   as noticed by Pavel Machek while reviewing nonseekable_open ->
   stream_open mass conversion.

 - the mass conversion patch promised in commit 10dce8af3422 ("fs:
   stream_open - opener for stream-like files so that read and write can
   run simultaneously without deadlock") and is automatically generated
   by running

        $ make coccicheck MODE=patch COCCI=scripts/coccinelle/api/stream_open.cocci

   I've verified each generated change manually - that it is correct to
   convert - and each other nonseekable_open instance left - that it is
   either not correct to convert there, or that it is not converted due
   to current stream_open.cocci limitations. More details on this in the
   patch.

 - finally, change VFS to pass ppos=NULL into .read/.write for files
   that declare themselves streams. It was suggested by Rasmus Villemoes
   and makes sure that if ppos starts to be erroneously used in a stream
   file, such bug won't go unnoticed and will produce an oops instead of
   creating illusion of position change being taken into account.

   Note: this patch does not conflict with "fuse: Add FOPEN_STREAM to
   use stream_open()" that will be hopefully coming via FUSE tree,
   because fs/fuse/ uses new-style .read_iter/.write_iter, and for these
   accessors position is still passed as non-pointer kiocb.ki_pos .

* tag 'stream_open-5.2' of https://lab.nexedi.com/kirr/linux:
  vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files
  *: convert stream-like files from nonseekable_open -> stream_open
  dtlk: remove double call to nonseekable_open

105 files changed, 179 insertions, 158 deletions

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
index 17cf249b18ee..3cb2f07ce8eb 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
@@ -628,7 +628,7 @@ static int mpc52xx_wdt_open(struct inode *inode, struct file *file)
         }
 
         file->private_data = mpc52xx_gpt_wdt;
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int mpc52xx_wdt_release(struct inode *inode, struct file *file)
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 48c2477e7e2a..bfb9ca99ac05 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -588,7 +588,7 @@ static int spufs_pipe_open(struct inode *inode, struct file *file)
         struct spufs_inode_info *i = SPUFS_I(inode);
         file->private_data = i->i_ctx;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /*
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
index 6d381279b362..000cb69ba0bc 100644
--- a/arch/um/drivers/harddog_kern.c
+++ b/arch/um/drivers/harddog_kern.c
@@ -85,7 +85,7 @@ static int harddog_open(struct inode *inode, struct file *file)
         timer_alive = 1;
         spin_unlock(&lock);
         mutex_unlock(&harddog_mutex);
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 err:
         spin_unlock(&lock);
         mutex_unlock(&harddog_mutex);
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 8a4a7823451a..c321f4f513f9 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -428,7 +428,7 @@ static int do_microcode_update(const void __user *buf, size_t size)
 
 static int microcode_open(struct inode *inode, struct file *file)
 {
-        return capable(CAP_SYS_RAWIO) ? nonseekable_open(inode, file) : -EPERM;
+        return capable(CAP_SYS_RAWIO) ? stream_open(inode, file) : -EPERM;
 }
 
 static ssize_t microcode_write(struct file *file, const char __user *buf,
diff --git a/drivers/char/ds1620.c b/drivers/char/ds1620.c
index a5ecf6dae02e..373f549525fe 100644
--- a/drivers/char/ds1620.c
+++ b/drivers/char/ds1620.c
@@ -212,7 +212,7 @@ static void ds1620_read_state(struct therm *therm)
 
 static int ds1620_open(struct inode *inode, struct file *file)
 {
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static ssize_t
diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
index f882460b5a44..4fed8fafa0f0 100644
--- a/drivers/char/dtlk.c
+++ b/drivers/char/dtlk.c
@@ -298,12 +298,11 @@ static int dtlk_open(struct inode *inode, struct file *file)
 {
         TRACE_TEXT("(dtlk_open");
 
-        nonseekable_open(inode, file);
         switch (iminor(inode)) {
         case DTLK_MINOR:
                 if (dtlk_busy)
                         return -EBUSY;
-                return nonseekable_open(inode, file);
+                return stream_open(inode, file);
 
         default:
                 return -ENXIO;
diff --git a/drivers/char/ipmi/ipmi_watchdog.c b/drivers/char/ipmi/ipmi_watchdog.c
index 2924a4bc4a32..74c6d1f34132 100644
--- a/drivers/char/ipmi/ipmi_watchdog.c
+++ b/drivers/char/ipmi/ipmi_watchdog.c
@@ -837,7 +837,7 @@ static int ipmi_open(struct inode *ino, struct file *filep)
                  * first heartbeat.
                  */
                 ipmi_start_timer_on_heartbeat = 1;
-                return nonseekable_open(ino, filep);
+                return stream_open(ino, filep);
 
         default:
                 return (-ENODEV);
diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c
index 7a4eb86aedac..15bf585af5d3 100644
--- a/drivers/char/pcmcia/cm4000_cs.c
+++ b/drivers/char/pcmcia/cm4000_cs.c
@@ -1682,7 +1682,7 @@ static int cmm_open(struct inode *inode, struct file *filp)
         link->open = 1;         /* only one open per device */
 
         DEBUGP(2, dev, "<- cmm_open\n");
-        ret = nonseekable_open(inode, filp);
+        ret = stream_open(inode, filp);
 out:
         mutex_unlock(&cmm_mutex);
         return ret;
diff --git a/drivers/char/pcmcia/scr24x_cs.c b/drivers/char/pcmcia/scr24x_cs.c
index f6b43d9350f0..04b39c3596cc 100644
--- a/drivers/char/pcmcia/scr24x_cs.c
+++ b/drivers/char/pcmcia/scr24x_cs.c
@@ -92,7 +92,7 @@ static int scr24x_open(struct inode *inode, struct file *filp)
         kref_get(&dev->refcnt);
         filp->private_data = dev;
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int scr24x_release(struct inode *inode, struct file *filp)
diff --git a/drivers/char/tb0219.c b/drivers/char/tb0219.c
index 7c19d9b22785..e8614ea843e2 100644
--- a/drivers/char/tb0219.c
+++ b/drivers/char/tb0219.c
@@ -243,7 +243,7 @@ static int tanbac_tb0219_open(struct inode *inode, struct file *file)
         case 16 ... 23:
         case 32 ... 39:
         case 48 ... 55:
-                return nonseekable_open(inode, file);
+                return stream_open(inode, file);
         default:
                 break;
         }
diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
index a128dd1126ae..515e96db4391 100644
--- a/drivers/firewire/nosy.c
+++ b/drivers/firewire/nosy.c
@@ -303,7 +303,7 @@ nosy_open(struct inode *inode, struct file *file)
 
         file->private_data = client;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 fail:
         kfree(client);
         lynx_put(lynx);
diff --git a/drivers/gnss/core.c b/drivers/gnss/core.c
index 320cfca80d5f..e6f94501cb28 100644
--- a/drivers/gnss/core.c
+++ b/drivers/gnss/core.c
@@ -42,7 +42,7 @@ static int gnss_open(struct inode *inode, struct file *file)
 
         get_device(&gdev->dev);
 
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
         file->private_data = gdev;
 
         down_write(&gdev->rwsem);
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 840634e0f1e3..dbaead0a5371 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -632,7 +632,7 @@ static int uhid_char_open(struct inode *inode, struct file *file)
         INIT_WORK(&uhid->worker, uhid_device_add_worker);
 
         file->private_data = uhid;
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         return 0;
 }
diff --git a/drivers/hwmon/fschmd.c b/drivers/hwmon/fschmd.c
index 042a166e1858..8fb54079fac8 100644
--- a/drivers/hwmon/fschmd.c
+++ b/drivers/hwmon/fschmd.c
@@ -837,7 +837,7 @@ static int watchdog_open(struct inode *inode, struct file *filp)
         watchdog_trigger(data);
         filp->private_data = data;
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int watchdog_release(struct inode *inode, struct file *filp)
diff --git a/drivers/hwmon/w83793.c b/drivers/hwmon/w83793.c
index 0af0f6283b35..e94ae1bb3cf0 100644
--- a/drivers/hwmon/w83793.c
+++ b/drivers/hwmon/w83793.c
@@ -1341,7 +1341,7 @@ static int watchdog_open(struct inode *inode, struct file *filp)
         /* Store pointer to data into filp's private data */
         filp->private_data = data;
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int watchdog_close(struct inode *inode, struct file *filp)
diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index 7541fbaf58a3..65c3230f5663 100644
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -1175,7 +1175,7 @@ static int ib_ucm_open(struct inode *inode, struct file *filp)
         file->filp = filp;
         file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int ib_ucm_close(struct inode *inode, struct file *filp)
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 7468b26b8a01..140a338a135f 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1744,7 +1744,7 @@ static int ucma_open(struct inode *inode, struct file *filp)
         filp->private_data = file;
         file->filp = filp;
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int ucma_close(struct inode *inode, struct file *filp)
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index 02b7947ab215..b58b07c03cfb 100644
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -985,7 +985,7 @@ static int ib_umad_open(struct inode *inode, struct file *filp)
 
         list_add_tail(&file->port_list, &port->file_list);
 
-        nonseekable_open(inode, filp);
+        stream_open(inode, filp);
 out:
         mutex_unlock(&port->file_mutex);
         return ret;
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index c489f545baae..8b43dd96d3b2 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -1132,7 +1132,7 @@ static int ib_uverbs_open(struct inode *inode, struct file *filp)
 
         setup_ufile_idr_uobject(file);
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 
 err_module:
         module_put(ib_dev->owner);
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index f48369d6f3a0..f040d8881ff2 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -524,7 +524,7 @@ static int evdev_open(struct inode *inode, struct file *file)
                 goto err_free_client;
 
         file->private_data = client;
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         return 0;
 
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
index 4c1e427dfabb..d806f6be4788 100644
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -279,7 +279,7 @@ static int joydev_open(struct inode *inode, struct file *file)
                 goto err_free_client;
 
         file->private_data = client;
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         return 0;
 
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index 26ec603fe220..1a6762fc38f9 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -398,7 +398,7 @@ static int uinput_open(struct inode *inode, struct file *file)
         newdev->state = UIST_NEW_DEVICE;
 
         file->private_data = newdev;
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         return 0;
 }
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index e1da70a9530c..3c3ad42f22bf 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -960,7 +960,7 @@ static int capi_open(struct inode *inode, struct file *file)
         list_add_tail(&cdev->list, &capidev_list);
         mutex_unlock(&capidev_list_lock);
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int capi_release(struct inode *inode, struct file *file)
diff --git a/drivers/leds/uleds.c b/drivers/leds/uleds.c
index 0c43bfac9598..08b6a769ff8f 100644
--- a/drivers/leds/uleds.c
+++ b/drivers/leds/uleds.c
@@ -74,7 +74,7 @@ static int uleds_open(struct inode *inode, struct file *file)
         udev->state = ULEDS_STATE_UNKNOWN;
 
         file->private_data = udev;
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         return 0;
 }
diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index f862f1b7f996..92db1e83c192 100644
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -195,7 +195,7 @@ static int ir_lirc_open(struct inode *inode, struct file *file)
         list_add(&fh->list, &dev->lirc_fh);
         spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
 
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         return 0;
 out_kfifo:
diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index e22766c79fe9..0f7b80144863 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -390,7 +390,7 @@ static int switchtec_dev_open(struct inode *inode, struct file *filp)
                 return PTR_ERR(stuser);
 
         filp->private_data = stuser;
-        nonseekable_open(inode, filp);
+        stream_open(inode, filp);
 
         dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser);
 
diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 71308766e891..2b8e8a01a739 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -132,7 +132,7 @@ static int cros_ec_console_log_open(struct inode *inode, struct file *file)
 {
         file->private_data = inode->i_private;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static ssize_t cros_ec_console_log_read(struct file *file, char __user *buf,
diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 38a2e9e684df..225a8df1d4e9 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -467,7 +467,7 @@ static int ds1374_wdt_open(struct inode *inode, struct file *file)
                  */
                 wdt_is_open = 1;
                 mutex_unlock(&ds1374->mutex);
-                return nonseekable_open(inode, file);
+                return stream_open(inode, file);
         }
         return -ENODEV;
 }
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index ebf50b1540f2..dd5a8991f75b 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -802,7 +802,7 @@ static int wdt_open(struct inode *inode, struct file *file)
                  */
                 wdt_is_open = 1;
                 mutex_unlock(&m41t80_rtc_mutex);
-                return nonseekable_open(inode, file);
+                return stream_open(inode, file);
         }
         return -ENODEV;
 }
diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
index 8b48ba9c598e..4c4683d8784a 100644
--- a/drivers/s390/char/fs3270.c
+++ b/drivers/s390/char/fs3270.c
@@ -486,7 +486,7 @@ fs3270_open(struct inode *inode, struct file *filp)
                 raw3270_del_view(&fp->view);
                 goto out;
         }
-        nonseekable_open(inode, filp);
+        stream_open(inode, filp);
         filp->private_data = fp;
 out:
         mutex_unlock(&fs3270_mutex);
diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c
index fc206c9d1c56..ea4253939555 100644
--- a/drivers/s390/char/tape_char.c
+++ b/drivers/s390/char/tape_char.c
@@ -290,7 +290,7 @@ tapechar_open (struct inode *inode, struct file *filp)
         rc = tape_open(device);
         if (rc == 0) {
                 filp->private_data = device;
-                nonseekable_open(inode, filp);
+                stream_open(inode, filp);
         } else
                 tape_put_device(device);
 
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index f75d3bfb5af3..405a60538630 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -191,7 +191,7 @@ static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf,
 
 static int zcore_reipl_open(struct inode *inode, struct file *filp)
 {
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int zcore_reipl_release(struct inode *inode, struct file *filp)
diff --git a/drivers/s390/crypto/zcrypt_api.c b/drivers/s390/crypto/zcrypt_api.c
index c31b2d31cd83..852b8c2299c1 100644
--- a/drivers/s390/crypto/zcrypt_api.c
+++ b/drivers/s390/crypto/zcrypt_api.c
@@ -525,7 +525,7 @@ static int zcrypt_open(struct inode *inode, struct file *filp)
         filp->private_data = (void *) perms;
 
         atomic_inc(&zcrypt_open_count);
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 /**
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 70966e10be7e..ce9142d87f41 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -593,7 +593,7 @@ static int spidev_open(struct inode *inode, struct file *filp)
 
         spidev->users++;
         filp->private_data = spidev;
-        nonseekable_open(inode, filp);
+        stream_open(inode, filp);
 
         mutex_unlock(&device_list_lock);
         return 0;
diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
index b2314636dc89..2299a11b1878 100644
--- a/drivers/staging/pi433/pi433_if.c
+++ b/drivers/staging/pi433/pi433_if.c
@@ -971,7 +971,7 @@ static int pi433_open(struct inode *inode, struct file *filp)
 
         /* instance data as context */
         filp->private_data = instance;
-        nonseekable_open(inode, filp);
+        stream_open(inode, filp);
 
         return 0;
 }
diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index 006762b72ff5..6581774bdfa4 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -307,7 +307,7 @@ static int ld_usb_open(struct inode *inode, struct file *file)
         int retval;
         struct usb_interface *interface;
 
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
         subminor = iminor(inode);
 
         interface = usb_find_interface(&ld_usb_driver, subminor);
diff --git a/drivers/watchdog/acquirewdt.c b/drivers/watchdog/acquirewdt.c
index d6210d946082..957d1255d4ca 100644
--- a/drivers/watchdog/acquirewdt.c
+++ b/drivers/watchdog/acquirewdt.c
@@ -200,7 +200,7 @@ static int acq_open(struct inode *inode, struct file *file)
 
         /* Activate */
         acq_keepalive();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int acq_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/advantechwdt.c b/drivers/watchdog/advantechwdt.c
index f61944369c1a..2766af292a71 100644
--- a/drivers/watchdog/advantechwdt.c
+++ b/drivers/watchdog/advantechwdt.c
@@ -199,7 +199,7 @@ static int advwdt_open(struct inode *inode, struct file *file)
          */
 
         advwdt_ping();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int advwdt_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/alim1535_wdt.c b/drivers/watchdog/alim1535_wdt.c
index 60f0c2eb8531..39a07bb5f6d5 100644
--- a/drivers/watchdog/alim1535_wdt.c
+++ b/drivers/watchdog/alim1535_wdt.c
@@ -249,7 +249,7 @@ static int ali_open(struct inode *inode, struct file *file)
 
         /* Activate */
         ali_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /*
diff --git a/drivers/watchdog/alim7101_wdt.c b/drivers/watchdog/alim7101_wdt.c
index 12f7ea62dddd..7e9884960eb9 100644
--- a/drivers/watchdog/alim7101_wdt.c
+++ b/drivers/watchdog/alim7101_wdt.c
@@ -214,7 +214,7 @@ static int fop_open(struct inode *inode, struct file *file)
                 return -EBUSY;
         /* Good, fire up the show */
         wdt_startup();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int fop_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c
index ee1ab12ab04f..b9b2d06b3879 100644
--- a/drivers/watchdog/ar7_wdt.c
+++ b/drivers/watchdog/ar7_wdt.c
@@ -163,7 +163,7 @@ static int ar7_wdt_open(struct inode *inode, struct file *file)
         ar7_wdt_enable_wdt();
         expect_close = 0;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int ar7_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
index b45fc0aee667..907a4545dee6 100644
--- a/drivers/watchdog/at91rm9200_wdt.c
+++ b/drivers/watchdog/at91rm9200_wdt.c
@@ -110,7 +110,7 @@ static int at91_wdt_open(struct inode *inode, struct file *file)
                 return -EBUSY;
 
         at91_wdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /*
diff --git a/drivers/watchdog/ath79_wdt.c b/drivers/watchdog/ath79_wdt.c
index e2209bf5fa8a..4f56b63f9691 100644
--- a/drivers/watchdog/ath79_wdt.c
+++ b/drivers/watchdog/ath79_wdt.c
@@ -132,7 +132,7 @@ static int ath79_wdt_open(struct inode *inode, struct file *file)
         clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
         ath79_wdt_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int ath79_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/bcm63xx_wdt.c b/drivers/watchdog/bcm63xx_wdt.c
index d3c1113e774c..e2af37c9a266 100644
--- a/drivers/watchdog/bcm63xx_wdt.c
+++ b/drivers/watchdog/bcm63xx_wdt.c
@@ -116,7 +116,7 @@ static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
                 return -EBUSY;
 
         bcm63xx_wdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int bcm63xx_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/cpu5wdt.c b/drivers/watchdog/cpu5wdt.c
index 6cfb102c397c..475360de6e9e 100644
--- a/drivers/watchdog/cpu5wdt.c
+++ b/drivers/watchdog/cpu5wdt.c
@@ -140,7 +140,7 @@ static int cpu5wdt_open(struct inode *inode, struct file *file)
 {
         if (test_and_set_bit(0, &cpu5wdt_device.inuse))
                 return -EBUSY;
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int cpu5wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index 32156e199c51..b5b078bdebe6 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -394,7 +394,7 @@ static int cpwd_open(struct inode *inode, struct file *f)
 
         mutex_unlock(&cpwd_mutex);
 
-        return nonseekable_open(inode, f);
+        return stream_open(inode, f);
 }
 
 static int cpwd_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/eurotechwdt.c b/drivers/watchdog/eurotechwdt.c
index 47f77a6fdfd6..89129e6fa9b6 100644
--- a/drivers/watchdog/eurotechwdt.c
+++ b/drivers/watchdog/eurotechwdt.c
@@ -316,7 +316,7 @@ static int eurwdt_open(struct inode *inode, struct file *file)
         eurwdt_timeout = WDT_TIMEOUT;   /* initial timeout */
         /* Activate the WDT */
         eurwdt_activate_timer();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
index 9a1c761258ce..021c6ace9462 100644
--- a/drivers/watchdog/f71808e_wdt.c
+++ b/drivers/watchdog/f71808e_wdt.c
@@ -525,7 +525,7 @@ static int watchdog_open(struct inode *inode, struct file *file)
                 __module_get(THIS_MODULE);
 
         watchdog.expect_close = 0;
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int watchdog_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/gef_wdt.c b/drivers/watchdog/gef_wdt.c
index 006e2348022c..26350b319505 100644
--- a/drivers/watchdog/gef_wdt.c
+++ b/drivers/watchdog/gef_wdt.c
@@ -229,7 +229,7 @@ static int gef_wdt_open(struct inode *inode, struct file *file)
 
         gef_wdt_handler_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int gef_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/geodewdt.c b/drivers/watchdog/geodewdt.c
index 88e01238f01b..c5a727da6657 100644
--- a/drivers/watchdog/geodewdt.c
+++ b/drivers/watchdog/geodewdt.c
@@ -92,7 +92,7 @@ static int geodewdt_open(struct inode *inode, struct file *file)
                 __module_get(THIS_MODULE);
 
         geodewdt_ping();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int geodewdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/ib700wdt.c b/drivers/watchdog/ib700wdt.c
index cc262284a6aa..30d6cec582af 100644
--- a/drivers/watchdog/ib700wdt.c
+++ b/drivers/watchdog/ib700wdt.c
@@ -238,7 +238,7 @@ static int ibwdt_open(struct inode *inode, struct file *file)
 
         /* Activate */
         ibwdt_ping();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int ibwdt_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/ibmasr.c b/drivers/watchdog/ibmasr.c
index 366b0474f278..897f7eda9e6a 100644
--- a/drivers/watchdog/ibmasr.c
+++ b/drivers/watchdog/ibmasr.c
@@ -323,7 +323,7 @@ static int asr_open(struct inode *inode, struct file *file)
         asr_toggle();
         asr_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int asr_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/indydog.c b/drivers/watchdog/indydog.c
index 5d20cdd30efe..5592b975fe3a 100644
--- a/drivers/watchdog/indydog.c
+++ b/drivers/watchdog/indydog.c
@@ -77,7 +77,7 @@ static int indydog_open(struct inode *inode, struct file *file)
 
         pr_info("Started watchdog timer\n");
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int indydog_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/intel_scu_watchdog.c b/drivers/watchdog/intel_scu_watchdog.c
index 0caab6241eb7..3181a72c7ddf 100644
--- a/drivers/watchdog/intel_scu_watchdog.c
+++ b/drivers/watchdog/intel_scu_watchdog.c
@@ -304,7 +304,7 @@ static int intel_scu_open(struct inode *inode, struct file *file)
         if (watchdog_device.driver_closed)
                 return -EPERM;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int intel_scu_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/iop_wdt.c b/drivers/watchdog/iop_wdt.c
index b16013ffacc2..d910a7dec21b 100644
--- a/drivers/watchdog/iop_wdt.c
+++ b/drivers/watchdog/iop_wdt.c
@@ -101,7 +101,7 @@ static int iop_wdt_open(struct inode *inode, struct file *file)
         clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
         wdt_enable();
         set_bit(WDT_ENABLED, &wdt_status);
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static ssize_t iop_wdt_write(struct file *file, const char *data, size_t len,
diff --git a/drivers/watchdog/it8712f_wdt.c b/drivers/watchdog/it8712f_wdt.c
index 41b3979a9d87..b1567240a0e6 100644
--- a/drivers/watchdog/it8712f_wdt.c
+++ b/drivers/watchdog/it8712f_wdt.c
@@ -327,7 +327,7 @@ static int it8712f_wdt_open(struct inode *inode, struct file *file)
         ret = it8712f_wdt_enable();
         if (ret)
                 return ret;
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int it8712f_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/ixp4xx_wdt.c b/drivers/watchdog/ixp4xx_wdt.c
index f20cc53ff719..dd139cda936c 100644
--- a/drivers/watchdog/ixp4xx_wdt.c
+++ b/drivers/watchdog/ixp4xx_wdt.c
@@ -65,7 +65,7 @@ static int ixp4xx_wdt_open(struct inode *inode, struct file *file)
 
         clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
         wdt_enable();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static ssize_t
diff --git a/drivers/watchdog/ks8695_wdt.c b/drivers/watchdog/ks8695_wdt.c
index 1e41818a44bc..0565cf30017b 100644
--- a/drivers/watchdog/ks8695_wdt.c
+++ b/drivers/watchdog/ks8695_wdt.c
@@ -142,7 +142,7 @@ static int ks8695_wdt_open(struct inode *inode, struct file *file)
                 return -EBUSY;
 
         ks8695_wdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /*
diff --git a/drivers/watchdog/m54xx_wdt.c b/drivers/watchdog/m54xx_wdt.c
index da6fa2b68074..752d03620f0a 100644
--- a/drivers/watchdog/m54xx_wdt.c
+++ b/drivers/watchdog/m54xx_wdt.c
@@ -85,7 +85,7 @@ static int m54xx_wdt_open(struct inode *inode, struct file *file)
 
         clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
         wdt_enable();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static ssize_t m54xx_wdt_write(struct file *file, const char *data,
diff --git a/drivers/watchdog/machzwd.c b/drivers/watchdog/machzwd.c
index 88d823d87a4b..53759415cf06 100644
--- a/drivers/watchdog/machzwd.c
+++ b/drivers/watchdog/machzwd.c
@@ -333,7 +333,7 @@ static int zf_open(struct inode *inode, struct file *file)
         if (nowayout)
                 __module_get(THIS_MODULE);
         zf_timer_on();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int zf_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/mixcomwd.c b/drivers/watchdog/mixcomwd.c
index 3cc07447c655..ece56db0a379 100644
--- a/drivers/watchdog/mixcomwd.c
+++ b/drivers/watchdog/mixcomwd.c
@@ -150,7 +150,7 @@ static int mixcomwd_open(struct inode *inode, struct file *file)
                         mixcomwd_timer_alive = 0;
                 }
         }
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int mixcomwd_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/mtx-1_wdt.c b/drivers/watchdog/mtx-1_wdt.c
index e028e0a2eca0..25a92857b217 100644
--- a/drivers/watchdog/mtx-1_wdt.c
+++ b/drivers/watchdog/mtx-1_wdt.c
@@ -118,7 +118,7 @@ static int mtx1_wdt_open(struct inode *inode, struct file *file)
 {
         if (test_and_set_bit(0, &mtx1_wdt_device.inuse))
                 return -EBUSY;
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 
diff --git a/drivers/watchdog/mv64x60_wdt.c b/drivers/watchdog/mv64x60_wdt.c
index 315275d7bab6..c785f4f0a196 100644
--- a/drivers/watchdog/mv64x60_wdt.c
+++ b/drivers/watchdog/mv64x60_wdt.c
@@ -133,7 +133,7 @@ static int mv64x60_wdt_open(struct inode *inode, struct file *file)
 
         mv64x60_wdt_handler_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int mv64x60_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/nuc900_wdt.c b/drivers/watchdog/nuc900_wdt.c
index 830bd04ff911..8a36350bab7b 100644
--- a/drivers/watchdog/nuc900_wdt.c
+++ b/drivers/watchdog/nuc900_wdt.c
@@ -131,7 +131,7 @@ static int nuc900_wdt_open(struct inode *inode, struct file *file)
 
         nuc900_wdt_start();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int nuc900_wdt_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/nv_tco.c b/drivers/watchdog/nv_tco.c
index a0fabf6f92b0..98d4f5371cf4 100644
--- a/drivers/watchdog/nv_tco.c
+++ b/drivers/watchdog/nv_tco.c
@@ -161,7 +161,7 @@ static int nv_tco_open(struct inode *inode, struct file *file)
         /* Reload and activate timer */
         tco_timer_keepalive();
         tco_timer_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int nv_tco_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/pc87413_wdt.c b/drivers/watchdog/pc87413_wdt.c
index 2ffa39b46970..ca21d6c240a3 100644
--- a/drivers/watchdog/pc87413_wdt.c
+++ b/drivers/watchdog/pc87413_wdt.c
@@ -286,7 +286,7 @@ static int pc87413_open(struct inode *inode, struct file *file)
 
         pr_info("Watchdog enabled. Timeout set to %d minute(s).\n", timeout);
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
diff --git a/drivers/watchdog/pcwd.c b/drivers/watchdog/pcwd.c
index b72ce68eacd3..a3415cf07c98 100644
--- a/drivers/watchdog/pcwd.c
+++ b/drivers/watchdog/pcwd.c
@@ -695,7 +695,7 @@ static int pcwd_open(struct inode *inode, struct file *file)
         /* Activate */
         pcwd_start();
         pcwd_keepalive();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int pcwd_close(struct inode *inode, struct file *file)
@@ -734,7 +734,7 @@ static int pcwd_temp_open(struct inode *inode, struct file *file)
         if (!pcwd_private.supports_temp)
                 return -ENODEV;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int pcwd_temp_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/pcwd_pci.c b/drivers/watchdog/pcwd_pci.c
index 1f78f0908621..5773d2591d3f 100644
--- a/drivers/watchdog/pcwd_pci.c
+++ b/drivers/watchdog/pcwd_pci.c
@@ -578,7 +578,7 @@ static int pcipcwd_open(struct inode *inode, struct file *file)
         /* Activate */
         pcipcwd_start();
         pcipcwd_keepalive();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int pcipcwd_release(struct inode *inode, struct file *file)
@@ -620,7 +620,7 @@ static int pcipcwd_temp_open(struct inode *inode, struct file *file)
         if (!pcipcwd_private.supports_temp)
                 return -ENODEV;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/pcwd_usb.c b/drivers/watchdog/pcwd_usb.c
index 4d02f26156f9..5de6182dae33 100644
--- a/drivers/watchdog/pcwd_usb.c
+++ b/drivers/watchdog/pcwd_usb.c
@@ -485,7 +485,7 @@ static int usb_pcwd_open(struct inode *inode, struct file *file)
         /* Activate */
         usb_pcwd_start(usb_pcwd_device);
         usb_pcwd_keepalive(usb_pcwd_device);
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int usb_pcwd_release(struct inode *inode, struct file *file)
@@ -524,7 +524,7 @@ static ssize_t usb_pcwd_temperature_read(struct file *file, char __user *data,
 
 static int usb_pcwd_temperature_open(struct inode *inode, struct file *file)
 {
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int usb_pcwd_temperature_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/pika_wdt.c b/drivers/watchdog/pika_wdt.c
index bb97f5b2f7eb..8938b3fb2b2d 100644
--- a/drivers/watchdog/pika_wdt.c
+++ b/drivers/watchdog/pika_wdt.c
@@ -118,7 +118,7 @@ static int pikawdt_open(struct inode *inode, struct file *file)
 
         pikawdt_start();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /*
diff --git a/drivers/watchdog/pnx833x_wdt.c b/drivers/watchdog/pnx833x_wdt.c
index 882fdcb46ad1..312899f39fd2 100644
--- a/drivers/watchdog/pnx833x_wdt.c
+++ b/drivers/watchdog/pnx833x_wdt.c
@@ -116,7 +116,7 @@ static int pnx833x_wdt_open(struct inode *inode, struct file *file)
 
         pr_info("Started watchdog timer\n");
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int pnx833x_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/rc32434_wdt.c b/drivers/watchdog/rc32434_wdt.c
index 3a75f3b53452..e74d5cf272ab 100644
--- a/drivers/watchdog/rc32434_wdt.c
+++ b/drivers/watchdog/rc32434_wdt.c
@@ -150,7 +150,7 @@ static int rc32434_wdt_open(struct inode *inode, struct file *file)
         rc32434_wdt_start();
         rc32434_wdt_ping();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int rc32434_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/rdc321x_wdt.c b/drivers/watchdog/rdc321x_wdt.c
index a281aa84bfb1..4382e9556860 100644
--- a/drivers/watchdog/rdc321x_wdt.c
+++ b/drivers/watchdog/rdc321x_wdt.c
@@ -142,7 +142,7 @@ static int rdc321x_wdt_open(struct inode *inode, struct file *file)
         if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
                 return -EBUSY;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int rdc321x_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/riowd.c b/drivers/watchdog/riowd.c
index aba53424605e..f7f7a7a62022 100644
--- a/drivers/watchdog/riowd.c
+++ b/drivers/watchdog/riowd.c
@@ -76,7 +76,7 @@ static void riowd_writereg(struct riowd *p, u8 val, int index)
 
 static int riowd_open(struct inode *inode, struct file *filp)
 {
-        nonseekable_open(inode, filp);
+        stream_open(inode, filp);
         return 0;
 }
 
diff --git a/drivers/watchdog/sa1100_wdt.c b/drivers/watchdog/sa1100_wdt.c
index d3be4f831db5..bfa035e1a75e 100644
--- a/drivers/watchdog/sa1100_wdt.c
+++ b/drivers/watchdog/sa1100_wdt.c
@@ -59,7 +59,7 @@ static int sa1100dog_open(struct inode *inode, struct file *file)
         writel_relaxed(OSSR_M3, OSSR);
         writel_relaxed(OWER_WME, OWER);
         writel_relaxed(readl_relaxed(OIER) | OIER_E3, OIER);
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /*
diff --git a/drivers/watchdog/sb_wdog.c b/drivers/watchdog/sb_wdog.c
index 3abae50773b8..0692d42e5c67 100644
--- a/drivers/watchdog/sb_wdog.c
+++ b/drivers/watchdog/sb_wdog.c
@@ -105,7 +105,7 @@ static const struct watchdog_info ident = {
  */
 static int sbwdog_open(struct inode *inode, struct file *file)
 {
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
         if (test_and_set_bit(0, &sbwdog_gate))
                 return -EBUSY;
         __module_get(THIS_MODULE);
diff --git a/drivers/watchdog/sbc60xxwdt.c b/drivers/watchdog/sbc60xxwdt.c
index 72d15fd1f183..4d127a91cbdc 100644
--- a/drivers/watchdog/sbc60xxwdt.c
+++ b/drivers/watchdog/sbc60xxwdt.c
@@ -208,7 +208,7 @@ static int fop_open(struct inode *inode, struct file *file)
 
         /* Good, fire up the show */
         wdt_startup();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int fop_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/sbc7240_wdt.c b/drivers/watchdog/sbc7240_wdt.c
index 5f268add17ce..efc81b318939 100644
--- a/drivers/watchdog/sbc7240_wdt.c
+++ b/drivers/watchdog/sbc7240_wdt.c
@@ -136,7 +136,7 @@ static int fop_open(struct inode *inode, struct file *file)
 
         wdt_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int fop_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/sbc8360.c b/drivers/watchdog/sbc8360.c
index da60560ca446..3396024e7b76 100644
--- a/drivers/watchdog/sbc8360.c
+++ b/drivers/watchdog/sbc8360.c
@@ -271,7 +271,7 @@ static int sbc8360_open(struct inode *inode, struct file *file)
         /* Activate and ping once to start the countdown */
         sbc8360_activate();
         sbc8360_ping();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int sbc8360_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/sbc_epx_c3.c b/drivers/watchdog/sbc_epx_c3.c
index a1c502e0d8ec..783037ffd7d8 100644
--- a/drivers/watchdog/sbc_epx_c3.c
+++ b/drivers/watchdog/sbc_epx_c3.c
@@ -78,7 +78,7 @@ static int epx_c3_open(struct inode *inode, struct file *file)
         epx_c3_alive = 1;
         pr_info("Started watchdog timer\n");
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int epx_c3_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/sbc_fitpc2_wdt.c b/drivers/watchdog/sbc_fitpc2_wdt.c
index a517d8bae757..3822a60a8d2b 100644
--- a/drivers/watchdog/sbc_fitpc2_wdt.c
+++ b/drivers/watchdog/sbc_fitpc2_wdt.c
@@ -75,7 +75,7 @@ static int fitpc2_wdt_open(struct inode *inode, struct file *file)
 
         wdt_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static ssize_t fitpc2_wdt_write(struct file *file, const char *data,
diff --git a/drivers/watchdog/sc1200wdt.c b/drivers/watchdog/sc1200wdt.c
index e035a4d4b299..3c2e9355410a 100644
--- a/drivers/watchdog/sc1200wdt.c
+++ b/drivers/watchdog/sc1200wdt.c
@@ -178,7 +178,7 @@ static int sc1200wdt_open(struct inode *inode, struct file *file)
         sc1200wdt_start();
         pr_info("Watchdog enabled, timeout = %d min(s)", timeout);
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 
diff --git a/drivers/watchdog/sc520_wdt.c b/drivers/watchdog/sc520_wdt.c
index 403542f9ed8d..44797414c886 100644
--- a/drivers/watchdog/sc520_wdt.c
+++ b/drivers/watchdog/sc520_wdt.c
@@ -258,7 +258,7 @@ static int fop_open(struct inode *inode, struct file *file)
 
         /* Good, fire up the show */
         wdt_startup();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int fop_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/sch311x_wdt.c b/drivers/watchdog/sch311x_wdt.c
index 814cdf539b0f..ed6e9fac5d74 100644
--- a/drivers/watchdog/sch311x_wdt.c
+++ b/drivers/watchdog/sch311x_wdt.c
@@ -316,7 +316,7 @@ static int sch311x_wdt_open(struct inode *inode, struct file *file)
          *      Activate
          */
         sch311x_wdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int sch311x_wdt_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/scx200_wdt.c b/drivers/watchdog/scx200_wdt.c
index ec4063ebb41a..85f2d8e06cd0 100644
--- a/drivers/watchdog/scx200_wdt.c
+++ b/drivers/watchdog/scx200_wdt.c
@@ -102,7 +102,7 @@ static int scx200_wdt_open(struct inode *inode, struct file *file)
                 return -EBUSY;
         scx200_wdt_enable();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int scx200_wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/smsc37b787_wdt.c b/drivers/watchdog/smsc37b787_wdt.c
index c768dcd53034..a22170775273 100644
--- a/drivers/watchdog/smsc37b787_wdt.c
+++ b/drivers/watchdog/smsc37b787_wdt.c
@@ -366,7 +366,7 @@ static int wb_smsc_wdt_open(struct inode *inode, struct file *file)
         pr_info("Watchdog enabled. Timeout set to %d %s\n",
                 timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /* close => shut off the timer */
diff --git a/drivers/watchdog/w83877f_wdt.c b/drivers/watchdog/w83877f_wdt.c
index db9b6488e388..8dd953f90680 100644
--- a/drivers/watchdog/w83877f_wdt.c
+++ b/drivers/watchdog/w83877f_wdt.c
@@ -224,7 +224,7 @@ static int fop_open(struct inode *inode, struct file *file)
 
         /* Good, fire up the show */
         wdt_startup();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int fop_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/w83977f_wdt.c b/drivers/watchdog/w83977f_wdt.c
index 672b61a7f9a3..184324c1edae 100644
--- a/drivers/watchdog/w83977f_wdt.c
+++ b/drivers/watchdog/w83977f_wdt.c
@@ -298,7 +298,7 @@ static int wdt_open(struct inode *inode, struct file *file)
                 __module_get(THIS_MODULE);
 
         wdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int wdt_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/wafer5823wdt.c b/drivers/watchdog/wafer5823wdt.c
index 93c5b610e264..0a8073b419f8 100644
--- a/drivers/watchdog/wafer5823wdt.c
+++ b/drivers/watchdog/wafer5823wdt.c
@@ -197,7 +197,7 @@ static int wafwdt_open(struct inode *inode, struct file *file)
          *      Activate
          */
         wafwdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int wafwdt_close(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index f6c24b22b37c..252a7c7b6592 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -825,7 +825,7 @@ static int watchdog_open(struct inode *inode, struct file *file)
                 kref_get(&wd_data->kref);
 
         /* dev/watchdog is a virtual (and thus non-seekable) filesystem */
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 
 out_mod:
         module_put(wd_data->wdd->ops->owner);
diff --git a/drivers/watchdog/wdrtas.c b/drivers/watchdog/wdrtas.c
index 0240c60d14e3..3c3ed512ce1e 100644
--- a/drivers/watchdog/wdrtas.c
+++ b/drivers/watchdog/wdrtas.c
@@ -376,7 +376,7 @@ static int wdrtas_open(struct inode *inode, struct file *file)
         wdrtas_timer_start();
         wdrtas_timer_keepalive();
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
@@ -442,7 +442,7 @@ static ssize_t wdrtas_temp_read(struct file *file, char __user *buf,
  */
 static int wdrtas_temp_open(struct inode *inode, struct file *file)
 {
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
diff --git a/drivers/watchdog/wdt.c b/drivers/watchdog/wdt.c
index e481fbbc4ae7..3d2f5ed60e88 100644
--- a/drivers/watchdog/wdt.c
+++ b/drivers/watchdog/wdt.c
@@ -421,7 +421,7 @@ static int wdt_open(struct inode *inode, struct file *file)
          *      Activate
          */
         wdt_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
@@ -481,7 +481,7 @@ static ssize_t wdt_temp_read(struct file *file, char __user *buf,
 
 static int wdt_temp_open(struct inode *inode, struct file *file)
 {
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
diff --git a/drivers/watchdog/wdt285.c b/drivers/watchdog/wdt285.c
index ebbb183be618..68843e7f224d 100644
--- a/drivers/watchdog/wdt285.c
+++ b/drivers/watchdog/wdt285.c
@@ -101,7 +101,7 @@ static int watchdog_open(struct inode *inode, struct file *file)
 
         ret = 0;
 #endif
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
         return ret;
 }
 
diff --git a/drivers/watchdog/wdt977.c b/drivers/watchdog/wdt977.c
index a8e6f87f60c9..59ed644dd4a9 100644
--- a/drivers/watchdog/wdt977.c
+++ b/drivers/watchdog/wdt977.c
@@ -273,7 +273,7 @@ static int wdt977_open(struct inode *inode, struct file *file)
                 __module_get(THIS_MODULE);
 
         wdt977_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 static int wdt977_release(struct inode *inode, struct file *file)
diff --git a/drivers/watchdog/wdt_pci.c b/drivers/watchdog/wdt_pci.c
index 10e2cda0ee5a..ff3a41f47127 100644
--- a/drivers/watchdog/wdt_pci.c
+++ b/drivers/watchdog/wdt_pci.c
@@ -461,7 +461,7 @@ static int wdtpci_open(struct inode *inode, struct file *file)
          *      Activate
          */
         wdtpci_start();
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
@@ -524,7 +524,7 @@ static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
 
 static int wdtpci_temp_open(struct inode *inode, struct file *file)
 {
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 }
 
 /**
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 6d1a5e58968f..f341b016672f 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -664,7 +664,7 @@ static int evtchn_open(struct inode *inode, struct file *filp)
 
         filp->private_data = u;
 
-        return nonseekable_open(inode, filp);
+        return stream_open(inode, filp);
 }
 
 static int evtchn_release(struct inode *inode, struct file *filp)
diff --git a/fs/open.c b/fs/open.c
index a00350018a47..9c7d724a6f67 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1219,8 +1219,9 @@ EXPORT_SYMBOL(nonseekable_open);
 /*
  * stream_open is used by subsystems that want stream-like file descriptors.
  * Such file descriptors are not seekable and don't have notion of position
- * (file.f_pos is always 0). Contrary to file descriptors of other regular
- * files, .read() and .write() can run simultaneously.
+ * (file.f_pos is always 0 and ppos passed to .read()/.write() is always NULL).
+ * Contrary to file descriptors of other regular files, .read() and .write()
+ * can run simultaneously.
  *
  * stream_open never fails and is marked to return int so that it could be
  * directly used as file_operations.open .
diff --git a/fs/read_write.c b/fs/read_write.c
index 61b43ad7608e..c543d965e288 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -365,29 +365,37 @@ out_putf:
 int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
 {
         struct inode *inode;
-        loff_t pos;
         int retval = -EINVAL;
 
         inode = file_inode(file);
         if (unlikely((ssize_t) count < 0))
                 return retval;
-        pos = *ppos;
-        if (unlikely(pos < 0)) {
-                if (!unsigned_offsets(file))
-                        return retval;
-                if (count >= -pos) /* both values are in 0..LLONG_MAX */
-                        return -EOVERFLOW;
-        } else if (unlikely((loff_t) (pos + count) < 0)) {
-                if (!unsigned_offsets(file))
-                        return retval;
-        }
 
-        if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
-                retval = locks_mandatory_area(inode, file, pos, pos + count - 1,
-                                read_write == READ ? F_RDLCK : F_WRLCK);
-                if (retval < 0)
-                        return retval;
+        /*
+         * ranged mandatory locking does not apply to streams - it makes sense
+         * only for files where position has a meaning.
+         */
+        if (ppos) {
+                loff_t pos = *ppos;
+
+                if (unlikely(pos < 0)) {
+                        if (!unsigned_offsets(file))
+                                return retval;
+                        if (count >= -pos) /* both values are in 0..LLONG_MAX */
+                                return -EOVERFLOW;
+                } else if (unlikely((loff_t) (pos + count) < 0)) {
+                        if (!unsigned_offsets(file))
+                                return retval;
+                }
+
+                if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
+                        retval = locks_mandatory_area(inode, file, pos, pos + count - 1,
+                                        read_write == READ ? F_RDLCK : F_WRLCK);
+                        if (retval < 0)
+                                return retval;
+                }
         }
+
         return security_file_permission(file,
                                 read_write == READ ? MAY_READ : MAY_WRITE);
 }
@@ -400,12 +408,13 @@ static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, lo
         ssize_t ret;
 
         init_sync_kiocb(&kiocb, filp);
-        kiocb.ki_pos = *ppos;
+        kiocb.ki_pos = (ppos ? *ppos : 0);
         iov_iter_init(&iter, READ, &iov, 1, len);
 
         ret = call_read_iter(filp, &kiocb, &iter);
         BUG_ON(ret == -EIOCBQUEUED);
-        *ppos = kiocb.ki_pos;
+        if (ppos)
+                *ppos = kiocb.ki_pos;
         return ret;
 }
 
@@ -468,12 +477,12 @@ static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t
         ssize_t ret;
 
         init_sync_kiocb(&kiocb, filp);
-        kiocb.ki_pos = *ppos;
+        kiocb.ki_pos = (ppos ? *ppos : 0);
         iov_iter_init(&iter, WRITE, &iov, 1, len);
 
         ret = call_write_iter(filp, &kiocb, &iter);
         BUG_ON(ret == -EIOCBQUEUED);
-        if (ret > 0)
+        if (ret > 0 && ppos)
                 *ppos = kiocb.ki_pos;
         return ret;
 }
@@ -558,15 +567,10 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
         return ret;
 }
 
-static inline loff_t file_pos_read(struct file *file)
-{
-        return file->f_mode & FMODE_STREAM ? 0 : file->f_pos;
-}
-
-static inline void file_pos_write(struct file *file, loff_t pos)
+/* file_ppos returns &file->f_pos or NULL if file is stream */
+static inline loff_t *file_ppos(struct file *file)
 {
-        if ((file->f_mode & FMODE_STREAM) == 0)
-                file->f_pos = pos;
+        return file->f_mode & FMODE_STREAM ? NULL : &file->f_pos;
 }
 
 ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count)
@@ -575,10 +579,14 @@ ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count)
         ssize_t ret = -EBADF;
 
         if (f.file) {
-                loff_t pos = file_pos_read(f.file);
-                ret = vfs_read(f.file, buf, count, &pos);
-                if (ret >= 0)
-                        file_pos_write(f.file, pos);
+                loff_t pos, *ppos = file_ppos(f.file);
+                if (ppos) {
+                        pos = *ppos;
+                        ppos = &pos;
+                }
+                ret = vfs_read(f.file, buf, count, ppos);
+                if (ret >= 0 && ppos)
+                        f.file->f_pos = pos;
                 fdput_pos(f);
         }
         return ret;
@@ -595,10 +603,14 @@ ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count)
         ssize_t ret = -EBADF;
 
         if (f.file) {
-                loff_t pos = file_pos_read(f.file);
-                ret = vfs_write(f.file, buf, count, &pos);
-                if (ret >= 0)
-                        file_pos_write(f.file, pos);
+                loff_t pos, *ppos = file_ppos(f.file);
+                if (ppos) {
+                        pos = *ppos;
+                        ppos = &pos;
+                }
+                ret = vfs_write(f.file, buf, count, ppos);
+                if (ret >= 0 && ppos)
+                        f.file->f_pos = pos;
                 fdput_pos(f);
         }
 
@@ -673,14 +685,15 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
         ret = kiocb_set_rw_flags(&kiocb, flags);
         if (ret)
                 return ret;
-        kiocb.ki_pos = *ppos;
+        kiocb.ki_pos = (ppos ? *ppos : 0);
 
         if (type == READ)
                 ret = call_read_iter(filp, &kiocb, iter);
         else
                 ret = call_write_iter(filp, &kiocb, iter);
         BUG_ON(ret == -EIOCBQUEUED);
-        *ppos = kiocb.ki_pos;
+        if (ppos)
+                *ppos = kiocb.ki_pos;
         return ret;
 }
 
@@ -1013,10 +1026,14 @@ static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec,
         ssize_t ret = -EBADF;
 
         if (f.file) {
-                loff_t pos = file_pos_read(f.file);
-                ret = vfs_readv(f.file, vec, vlen, &pos, flags);
-                if (ret >= 0)
-                        file_pos_write(f.file, pos);
+                loff_t pos, *ppos = file_ppos(f.file);
+                if (ppos) {
+                        pos = *ppos;
+                        ppos = &pos;
+                }
+                ret = vfs_readv(f.file, vec, vlen, ppos, flags);
+                if (ret >= 0 && ppos)
+                        f.file->f_pos = pos;
                 fdput_pos(f);
         }
 
@@ -1033,10 +1050,14 @@ static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec,
         ssize_t ret = -EBADF;
 
         if (f.file) {
-                loff_t pos = file_pos_read(f.file);
-                ret = vfs_writev(f.file, vec, vlen, &pos, flags);
-                if (ret >= 0)
-                        file_pos_write(f.file, pos);
+                loff_t pos, *ppos = file_ppos(f.file);
+                if (ppos) {
+                        pos = *ppos;
+                        ppos = &pos;
+                }
+                ret = vfs_writev(f.file, vec, vlen, ppos, flags);
+                if (ret >= 0 && ppos)
+                        f.file->f_pos = pos;
                 fdput_pos(f);
         }
 
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 9859ababb82e..3ff32125f4b5 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -77,7 +77,7 @@ static int batadv_socket_open(struct inode *inode, struct file *file)
 
         batadv_debugfs_deprecated(file, "");
 
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
 
         socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
         if (!socket_client) {
diff --git a/net/batman-adv/log.c b/net/batman-adv/log.c
index 3e610df8debf..e8ff13598c08 100644
--- a/net/batman-adv/log.c
+++ b/net/batman-adv/log.c
@@ -102,7 +102,7 @@ static int batadv_log_open(struct inode *inode, struct file *file)
         batadv_debugfs_deprecated(file,
                                   "Use tracepoint batadv:batadv_dbg instead\n");
 
-        nonseekable_open(inode, file);
+        stream_open(inode, file);
         file->private_data = inode->i_private;
         return 0;
 }
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index abca57040f37..742e186bfadb 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1143,7 +1143,7 @@ static int rfkill_fop_open(struct inode *inode, struct file *file)
 
         file->private_data = data;
 
-        return nonseekable_open(inode, file);
+        return stream_open(inode, file);
 
  free:
         mutex_unlock(&data->mtx);
diff --git a/sound/core/control.c b/sound/core/control.c
index fad7db402443..a5cc9a874062 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -54,7 +54,7 @@ static int snd_ctl_open(struct inode *inode, struct file *file)
         struct snd_ctl_file *ctl;
         int i, err;
 
-        err = nonseekable_open(inode, file);
+        err = stream_open(inode, file);
         if (err < 0)
                 return err;
 
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index c0690d1ecd55..4666bb366c0c 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -382,7 +382,7 @@ static int snd_rawmidi_open(struct inode *inode, struct file *file)
         if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
                 return -EINVAL;         /* invalid combination */
 
-        err = nonseekable_open(inode, file);
+        err = stream_open(inode, file);
         if (err < 0)
                 return err;
 
diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index 38e7deab6384..a11bdc0350fc 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -307,7 +307,7 @@ static int snd_seq_open(struct inode *inode, struct file *file)
         struct snd_seq_user_client *user;
         int err;
 
-        err = nonseekable_open(inode, file);
+        err = stream_open(inode, file);
         if (err < 0)
                 return err;
 
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 61a0cec6e1f6..b842b61f66c2 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1425,7 +1425,7 @@ static int snd_timer_user_open(struct inode *inode, struct file *file)
         struct snd_timer_user *tu;
         int err;
 
-        err = nonseekable_open(inode, file);
+        err = stream_open(inode, file);
         if (err < 0)
                 return err;