V4L/DVB (6335): cx8802: Replace list_for_each+list_entry with list_for_each_entry

Less code and more efficient.

Got ride of a variable that counted the number of devices in
cx8802_unregister_driver() but was never used.  Looked leftover from a
cut&paste.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Reviewed-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/cx88/cx88-mpeg.c

@@ -178,7 +178,6 @@ static int cx8802_restart_queue(struct cx8802_dev    *dev,
 				struct cx88_dmaqueue *q)
 {
 	struct cx88_buffer *buf;
-	struct list_head *item;
 
 	dprintk( 1, "cx8802_restart_queue\n" );
 	if (list_empty(&q->active))
@@ -224,10 +223,8 @@ static int cx8802_restart_queue(struct cx8802_dev    *dev,
 	dprintk(2,"restart_queue [%p/%d]: restart dma\n",
 		buf, buf->vb.i);
 	cx8802_start_dma(dev, q, buf);
-	list_for_each(item,&q->active) {
-		buf = list_entry(item, struct cx88_buffer, vb.queue);
+	list_for_each_entry(buf, &q->active, vb.queue)
 		buf->count = q->count++;
-	}
 	mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 	return 0;
 }
@@ -578,14 +575,11 @@ int cx8802_resume_common(struct pci_dev *pci_dev)
 struct cx8802_dev * cx8802_get_device(struct inode *inode)
 {
 	int minor = iminor(inode);
-	struct cx8802_dev *h = NULL;
-	struct list_head *list;
+	struct cx8802_dev *dev;
 
-	list_for_each(list,&cx8802_devlist) {
-		h = list_entry(list, struct cx8802_dev, devlist);
-		if (h->mpeg_dev && h->mpeg_dev->minor == minor)
-			return h;
-	}
+	list_for_each_entry(dev, &cx8802_devlist, devlist)
+		if (dev->mpeg_dev && dev->mpeg_dev->minor == minor)
+			return dev;
 
 	return NULL;
 }
@@ -595,14 +589,10 @@ EXPORT_SYMBOL(cx8802_get_device);
 struct cx8802_driver * cx8802_get_driver(struct cx8802_dev *dev, enum cx88_board_type btype)
 {
 	struct cx8802_driver *d;
-	struct list_head *list;
-
-	list_for_each(list, &dev->drvlist) {
-		d = list_entry(list, struct cx8802_driver, drvlist);
 
+	list_for_each_entry(d, &dev->drvlist, drvlist)
 		if (d->type_id == btype)
 			return d;
-	}
 
 	return NULL;
 }
@@ -666,10 +656,9 @@ static int cx8802_check_driver(struct cx8802_driver *drv)
 
 int cx8802_register_driver(struct cx8802_driver *drv)
 {
-	struct cx8802_dev *h;
+	struct cx8802_dev *dev;
 	struct cx8802_driver *driver;
-	struct list_head *list;
-	int err = 0, i = 0;
+	int err, i = 0;
 
 	printk(KERN_INFO
 	       "cx88/2: registering cx8802 driver, type: %s access: %s\n",
@@ -681,14 +670,12 @@ int cx8802_register_driver(struct cx8802_driver *drv)
 		return err;
 	}
 
-	list_for_each(list,&cx8802_devlist) {
-		h = list_entry(list, struct cx8802_dev, devlist);
-
+	list_for_each_entry(dev, &cx8802_devlist, devlist) {
 		printk(KERN_INFO
 		       "%s/2: subsystem: %04x:%04x, board: %s [card=%d]\n",
-		       h->core->name, h->pci->subsystem_vendor,
-		       h->pci->subsystem_device, h->core->board.name,
-		       h->core->boardnr);
+		       dev->core->name, dev->pci->subsystem_vendor,
+		       dev->pci->subsystem_device, dev->core->board.name,
+		       dev->core->boardnr);
 
 		/* Bring up a new struct for each driver instance */
 		driver = kzalloc(sizeof(*drv),GFP_KERNEL);
@@ -696,7 +683,7 @@ int cx8802_register_driver(struct cx8802_driver *drv)
 			return -ENOMEM;
 
 		/* Snapshot of the driver registration data */
-		drv->core = h->core;
+		drv->core = dev->core;
 		drv->suspend = cx8802_suspend_common;
 		drv->resume = cx8802_resume_common;
 		drv->request_acquire = cx8802_request_acquire;
@@ -707,49 +694,38 @@ int cx8802_register_driver(struct cx8802_driver *drv)
 		if (err == 0) {
 			i++;
 			mutex_lock(&drv->core->lock);
-			list_add_tail(&driver->drvlist, &h->drvlist);
+			list_add_tail(&driver->drvlist, &dev->drvlist);
 			mutex_unlock(&drv->core->lock);
 		} else {
 			printk(KERN_ERR
 			       "%s/2: cx8802 probe failed, err = %d\n",
-			       h->core->name, err);
+			       dev->core->name, err);
 		}
 
 	}
-	if (i == 0)
-		err = -ENODEV;
-	else
-		err = 0;
 
-	return err;
+	return i ? 0 : -ENODEV;
 }
 
 int cx8802_unregister_driver(struct cx8802_driver *drv)
 {
-	struct cx8802_dev *h;
-	struct cx8802_driver *d;
-	struct list_head *list;
-	struct list_head *list2, *q;
-	int err = 0, i = 0;
+	struct cx8802_dev *dev;
+	struct cx8802_driver *d, *dtmp;
+	int err = 0;
 
 	printk(KERN_INFO
 	       "cx88/2: unregistering cx8802 driver, type: %s access: %s\n",
 	       drv->type_id == CX88_MPEG_DVB ? "dvb" : "blackbird",
 	       drv->hw_access == CX8802_DRVCTL_SHARED ? "shared" : "exclusive");
 
-	list_for_each(list,&cx8802_devlist) {
-		i++;
-		h = list_entry(list, struct cx8802_dev, devlist);
-
+	list_for_each_entry(dev, &cx8802_devlist, devlist) {
 		printk(KERN_INFO
 		       "%s/2: subsystem: %04x:%04x, board: %s [card=%d]\n",
-		       h->core->name, h->pci->subsystem_vendor,
-		       h->pci->subsystem_device, h->core->board.name,
-		       h->core->boardnr);
-
-		list_for_each_safe(list2, q, &h->drvlist) {
-			d = list_entry(list2, struct cx8802_driver, drvlist);
+		       dev->core->name, dev->pci->subsystem_vendor,
+		       dev->pci->subsystem_device, dev->core->board.name,
+		       dev->core->boardnr);
 
+		list_for_each_entry_safe(d, dtmp, &dev->drvlist, drvlist) {
 			/* only unregister the correct driver type */
 			if (d->type_id != drv->type_id)
 				continue;
@@ -757,11 +733,11 @@ int cx8802_unregister_driver(struct cx8802_driver *drv)
 			err = d->remove(d);
 			if (err == 0) {
 				mutex_lock(&drv->core->lock);
-				list_del(list2);
+				list_del(&d->drvlist);
 				mutex_unlock(&drv->core->lock);
 			} else
 				printk(KERN_ERR "%s/2: cx8802 driver remove "
-				       "failed (%d)\n", h->core->name, err);
+				       "failed (%d)\n", dev->core->name, err);
 		}
 
 	}
@@ -825,21 +801,18 @@ static void __devexit cx8802_remove(struct pci_dev *pci_dev)
 	dprintk( 1, "%s\n", __FUNCTION__);
 
 	if (!list_empty(&dev->drvlist)) {
-		struct list_head *list, *tmp;
-		struct cx8802_driver *drv;
+		struct cx8802_driver *drv, *tmp;
 		int err;
 
 		printk(KERN_WARNING "%s/2: Trying to remove cx8802 driver "
 		       "while cx8802 sub-drivers still loaded?!\n",
 		       dev->core->name);
 
-		list_for_each_safe(list, tmp, &dev->drvlist) {
-			drv = list_entry(list, struct cx8802_driver, drvlist);
-
+		list_for_each_entry_safe(drv, tmp, &dev->drvlist, drvlist) {
 			err = drv->remove(drv);
 			if (err == 0) {
 				mutex_lock(&drv->core->lock);
-				list_del(list);
+				list_del(&drv->drvlist);
 				mutex_unlock(&drv->core->lock);
 			} else
 				printk(KERN_ERR "%s/2: cx8802 driver remove "