[media] cx231xx: fix device disconnect checks

The driver were using DEV_MISCONFIGURED on some places, and
DEV_DISCONNECTED on others. In a matter of fact, DEV_MISCONFIGURED
were set only during the usb disconnect callback, with
was confusing.

Also, the alsa driver never checks if the device is present,
before doing some dangerous things.

Remove DEV_MISCONFIGURED, replacing it by DEV_DISCONNECTED.

Also, fixes the other usecases for DEV_DISCONNECTED.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

6 files changed, 29 insertions, 17 deletions

diff --git a/drivers/media/video/cx231xx/cx231xx-audio.c b/drivers/media/video/cx231xx/cx231xx-audio.c
index 30d13c15739a..e5742a0e19a0 100644
--- a/drivers/media/video/cx231xx/cx231xx-audio.c
+++ b/drivers/media/video/cx231xx/cx231xx-audio.c
@@ -111,6 +111,9 @@ static void cx231xx_audio_isocirq(struct urb *urb)
         struct snd_pcm_substream *substream;
         struct snd_pcm_runtime *runtime;
 
+        if (dev->state & DEV_DISCONNECTED)
+                return;
+
         switch (urb->status) {
         case 0:         /* success */
         case -ETIMEDOUT:        /* NAK */
@@ -196,6 +199,9 @@ static void cx231xx_audio_bulkirq(struct urb *urb)
         struct snd_pcm_substream *substream;
         struct snd_pcm_runtime *runtime;
 
+        if (dev->state & DEV_DISCONNECTED)
+                return;
+
         switch (urb->status) {
         case 0:         /* success */
         case -ETIMEDOUT:        /* NAK */
@@ -273,6 +279,9 @@ static int cx231xx_init_audio_isoc(struct cx231xx *dev)
 
         cx231xx_info("%s: Starting ISO AUDIO transfers\n", __func__);
 
+        if (dev->state & DEV_DISCONNECTED)
+                return -ENODEV;
+
         sb_size = CX231XX_ISO_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 
         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
@@ -331,6 +340,9 @@ static int cx231xx_init_audio_bulk(struct cx231xx *dev)
 
         cx231xx_info("%s: Starting BULK AUDIO transfers\n", __func__);
 
+        if (dev->state & DEV_DISCONNECTED)
+                return -ENODEV;
+
         sb_size = CX231XX_NUM_AUDIO_PACKETS * dev->adev.max_pkt_size;
 
         for (i = 0; i < CX231XX_AUDIO_BUFS; i++) {
@@ -432,6 +444,11 @@ static int snd_cx231xx_capture_open(struct snd_pcm_substream *substream)
                 return -ENODEV;
         }
 
+        if (dev->state & DEV_DISCONNECTED) {
+                cx231xx_errdev("Can't open. the device was removed.\n");
+                return -ENODEV;
+        }
+
         /* Sets volume, mute, etc */
         dev->mute = 0;
 
@@ -571,6 +588,9 @@ static int snd_cx231xx_capture_trigger(struct snd_pcm_substream *substream,
         struct cx231xx *dev = snd_pcm_substream_chip(substream);
         int retval;
 
+        if (dev->state & DEV_DISCONNECTED)
+                return -ENODEV;
+
         spin_lock(&dev->adev.slock);
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
diff --git a/drivers/media/video/cx231xx/cx231xx-cards.c b/drivers/media/video/cx231xx/cx231xx-cards.c
index 1f2fbbfebc76..7577e6e50136 100644
--- a/drivers/media/video/cx231xx/cx231xx-cards.c
+++ b/drivers/media/video/cx231xx/cx231xx-cards.c
@@ -1337,6 +1337,8 @@ static void cx231xx_usb_disconnect(struct usb_interface *interface)
         if (!dev->udev)
                 return;
 
+        dev->state |= DEV_DISCONNECTED;
+
         flush_request_modules(dev);
 
         /* wait until all current v4l2 io is finished then deallocate
@@ -1354,16 +1356,13 @@ static void cx231xx_usb_disconnect(struct usb_interface *interface)
                 /* Even having users, it is safe to remove the RC i2c driver */
                 cx231xx_ir_exit(dev);
 
-                dev->state |= DEV_MISCONFIGURED;
                 if (dev->USE_ISO)
                         cx231xx_uninit_isoc(dev);
                 else
                         cx231xx_uninit_bulk(dev);
-                dev->state |= DEV_DISCONNECTED;
                 wake_up_interruptible(&dev->wait_frame);
                 wake_up_interruptible(&dev->wait_stream);
         } else {
-                dev->state |= DEV_DISCONNECTED;
         }
 
         cx231xx_close_extension(dev);
diff --git a/drivers/media/video/cx231xx/cx231xx-dvb.c b/drivers/media/video/cx231xx/cx231xx-dvb.c
index da9a4a0aab79..7c4e360ba9bc 100644
--- a/drivers/media/video/cx231xx/cx231xx-dvb.c
+++ b/drivers/media/video/cx231xx/cx231xx-dvb.c
@@ -196,7 +196,7 @@ static inline int dvb_isoc_copy(struct cx231xx *dev, struct urb *urb)
         if (!dev)
                 return 0;
 
-        if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+        if (dev->state & DEV_DISCONNECTED)
                 return 0;
 
         if (urb->status < 0) {
@@ -228,7 +228,7 @@ static inline int dvb_bulk_copy(struct cx231xx *dev, struct urb *urb)
         if (!dev)
                 return 0;
 
-        if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+        if (dev->state & DEV_DISCONNECTED)
                 return 0;
 
         if (urb->status < 0) {
diff --git a/drivers/media/video/cx231xx/cx231xx-vbi.c b/drivers/media/video/cx231xx/cx231xx-vbi.c
index 1c7a4daafecf..9c5967e1d0c6 100644
--- a/drivers/media/video/cx231xx/cx231xx-vbi.c
+++ b/drivers/media/video/cx231xx/cx231xx-vbi.c
@@ -93,7 +93,7 @@ static inline int cx231xx_isoc_vbi_copy(struct cx231xx *dev, struct urb *urb)
         if (!dev)
                 return 0;
 
-        if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+        if (dev->state & DEV_DISCONNECTED)
                 return 0;
 
         if (urb->status < 0) {
diff --git a/drivers/media/video/cx231xx/cx231xx-video.c b/drivers/media/video/cx231xx/cx231xx-video.c
index 6e81f970dc7d..829a41b0c9ef 100644
--- a/drivers/media/video/cx231xx/cx231xx-video.c
+++ b/drivers/media/video/cx231xx/cx231xx-video.c
@@ -337,7 +337,7 @@ static inline int cx231xx_isoc_copy(struct cx231xx *dev, struct urb *urb)
         if (!dev)
                 return 0;
 
-        if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+        if (dev->state & DEV_DISCONNECTED)
                 return 0;
 
         if (urb->status < 0) {
@@ -440,7 +440,7 @@ static inline int cx231xx_bulk_copy(struct cx231xx *dev, struct urb *urb)
         if (!dev)
                 return 0;
 
-        if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
+        if (dev->state & DEV_DISCONNECTED)
                 return 0;
 
         if (urb->status < 0) {
@@ -1000,12 +1000,6 @@ static int check_dev(struct cx231xx *dev)
                 cx231xx_errdev("v4l2 ioctl: device not present\n");
                 return -ENODEV;
         }
-
-        if (dev->state & DEV_MISCONFIGURED) {
-                cx231xx_errdev("v4l2 ioctl: device is misconfigured; "
-                               "close and open it again\n");
-                return -EIO;
-        }
         return 0;
 }
 
@@ -2347,7 +2341,8 @@ static int cx231xx_v4l2_close(struct file *filp)
                         return 0;
                 }
 
-        if (dev->users == 1) {
+        dev->users--;
+        if (!dev->users) {
                 videobuf_stop(&fh->vb_vidq);
                 videobuf_mmap_free(&fh->vb_vidq);
 
@@ -2374,7 +2369,6 @@ static int cx231xx_v4l2_close(struct file *filp)
                 cx231xx_set_alt_setting(dev, INDEX_VIDEO, 0);
         }
         kfree(fh);
-        dev->users--;
         wake_up_interruptible_nr(&dev->open, 1);
         return 0;
 }
diff --git a/drivers/media/video/cx231xx/cx231xx.h b/drivers/media/video/cx231xx/cx231xx.h
index 5d498a4112d7..e17447554a0d 100644
--- a/drivers/media/video/cx231xx/cx231xx.h
+++ b/drivers/media/video/cx231xx/cx231xx.h
@@ -377,7 +377,6 @@ struct cx231xx_board {
 enum cx231xx_dev_state {
         DEV_INITIALIZED = 0x01,
         DEV_DISCONNECTED = 0x02,
-        DEV_MISCONFIGURED = 0x04,
 };
 
 enum AFE_MODE {