V4L/DVB (10223): zoran: Remove global device array

The driver was keeping a global array with an entry for each zoran device
probed.  It was a leftover from when the driver didn't dynamically allocate
the driver data for each device.

There was only one use left, in the video device's ->open() method, looking
up the struct zoran for the opened device from the minor number.  This can
be done better with video_get_drvdata().

Since zoran_num is now only used in the pci driver's ->probe() method, it
doesn't need to be an atomic_t and be static.  There is a race if multiple
zoran cards could be probed at the same time, but currently the probe
method for a given driver is single threaded.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 6 insertions, 30 deletions

diff --git a/drivers/media/video/zoran/zoran_card.c b/drivers/media/video/zoran/zoran_card.c
index ae96de08759..117650fecd8 100644
--- a/drivers/media/video/zoran/zoran_card.c
+++ b/drivers/media/video/zoran/zoran_card.c
@@ -159,8 +159,7 @@ static struct pci_device_id zr36067_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, zr36067_pci_tbl);
 
-atomic_t zoran_num = ATOMIC_INIT(0);            /* number of Buzs in use */
-struct zoran *zoran[BUZ_MAX];
+static unsigned int zoran_num;          /* number of cards found */
 
 /* videocodec bus functions ZR36060 */
 static u32
@@ -1144,6 +1143,7 @@ zr36057_init (struct zoran *zr)
         err = video_register_device(zr->video_dev, VFL_TYPE_GRABBER, video_nr[zr->id]);
         if (err < 0)
                 goto exit_free;
+        video_set_drvdata(zr->video_dev, zr);
 
         zoran_init_hardware(zr);
         if (zr36067_debug > 2)
@@ -1275,7 +1275,7 @@ static int __devinit zoran_probe(struct pci_dev *pdev,
         unsigned int nr;
 
 
-        nr = atomic_inc_return(&zoran_num) - 1;
+        nr = zoran_num++;
         if (nr >= BUZ_MAX) {
                 dprintk(1,
                         KERN_ERR
@@ -1291,7 +1291,6 @@ static int __devinit zoran_probe(struct pci_dev *pdev,
                         KERN_ERR
                         "%s: find_zr36057() - kzalloc failed\n",
                         ZORAN_NAME);
-                /* The entry in zoran[] gets leaked */
                 return -ENOMEM;
         }
         zr->pci_dev = pdev;
@@ -1547,7 +1546,6 @@ static int __devinit zoran_probe(struct pci_dev *pdev,
                         goto zr_detach_vfe;
                 }
         }
-        zoran[nr] = zr;
 
         /* take care of Natoma chipset and a revision 1 zr36057 */
         if ((pci_pci_problems & PCIPCI_NATOMA) && zr->revision <= 1) {
@@ -1599,7 +1597,6 @@ static int __init zoran_init(void)
 {
         int res;
 
-        memset(zoran, 0, sizeof(zoran));
         printk(KERN_INFO "Zoran MJPEG board driver version %d.%d.%d\n",
                MAJOR_VERSION, MINOR_VERSION, RELEASE_VERSION);
 
diff --git a/drivers/media/video/zoran/zoran_card.h b/drivers/media/video/zoran/zoran_card.h
index c989448a77d..4507bdc5e33 100644
--- a/drivers/media/video/zoran/zoran_card.h
+++ b/drivers/media/video/zoran/zoran_card.h
@@ -40,8 +40,6 @@ extern int zr36067_debug;
 
 /* Anybody who uses more than four? */
 #define BUZ_MAX 4
-extern atomic_t zoran_num;
-extern struct zoran *zoran[BUZ_MAX];
 
 extern struct video_device zoran_template;
 
diff --git a/drivers/media/video/zoran/zoran_driver.c b/drivers/media/video/zoran/zoran_driver.c
index 5e667fd7272..21f37a68714 100644
--- a/drivers/media/video/zoran/zoran_driver.c
+++ b/drivers/media/video/zoran/zoran_driver.c
@@ -1196,28 +1196,13 @@ zoran_close_end_session (struct file *file)
  *   Open a zoran card. Right now the flags stuff is just playing
  */
 
-static int
-zoran_open(struct file  *file)
+static int zoran_open(struct file *file)
 {
-        unsigned int minor = video_devdata(file)->minor;
-        struct zoran *zr = NULL;
+        struct zoran *zr = video_drvdata(file);
         struct zoran_fh *fh;
-        int i, res, first_open = 0, have_module_locks = 0;
+        int res, first_open = 0, have_module_locks = 0;
 
         lock_kernel();
-        /* find the device */
-        for (i = 0; i < atomic_read(&zoran_num); i++) {
-                if (zoran[i]->video_dev->minor == minor) {
-                        zr = zoran[i];
-                        break;
-                }
-        }
-
-        if (!zr) {
-                dprintk(1, KERN_ERR "%s: device not found!\n", ZORAN_NAME);
-                res = -ENODEV;
-                goto open_unlock_and_return;
-        }
 
         /* see fs/device.c - the kernel already locks during open(),
          * so locking ourselves only causes deadlocks */
@@ -1329,10 +1314,6 @@ open_unlock_and_return:
                 module_put(THIS_MODULE);
         }
 
-        /* if there's no device found, we didn't obtain the lock either */
-        if (zr) {
-                /*mutex_unlock(&zr->resource_lock);*/
-        }
         unlock_kernel();
 
         return res;