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>

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);
 

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;
 

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;