V4L/DVB (9776): cx18: Change to per CX23418 device work queues for deferrable work handling

cx18: Change to per CX23418 device work queues for deferrable work handling.
Needed to support 2.6.22 and earlier kernels that can't selectively cancel
work orders.  Also will provide slightly better performance on SMP systems.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-driver.c

@@ -56,9 +56,6 @@ struct cx18 *cx18_cards[CX18_MAX_CARDS];
 /* Protects cx18_cards_active */
 DEFINE_SPINLOCK(cx18_cards_lock);
 
-/* Queue for deferrable IRQ handling work for all cx18 cards in system */
-struct workqueue_struct *cx18_work_queue;
-
 /* add your revision and whatnot here */
 static struct pci_device_id cx18_pci_tbl[] __devinitdata = {
 	{PCI_VENDOR_ID_CX, PCI_DEVICE_ID_CX23418,
@@ -446,6 +443,12 @@ static int __devinit cx18_init_struct1(struct cx18 *cx)
 
 	spin_lock_init(&cx->lock);
 
+	cx->work_queue = create_singlethread_workqueue(cx->name);
+	if (cx->work_queue == NULL) {
+		CX18_ERR("Unable to create work hander thread\n");
+		return -ENOMEM;
+	}
+
 	for (i = 0; i < CX18_MAX_EPU_WORK_ORDERS; i++) {
 		cx->epu_work_order[i].cx = cx;
 		cx->epu_work_order[i].str = cx->epu_debug_str;
@@ -655,12 +658,9 @@ static int __devinit cx18_probe(struct pci_dev *dev,
 
 	/* PCI Device Setup */
 	retval = cx18_setup_pci(cx, dev, pci_id);
-	if (retval != 0) {
-		if (retval == -EIO)
-			goto free_workqueue;
-		else if (retval == -ENXIO)
-			goto free_mem;
-	}
+	if (retval != 0)
+		goto free_workqueue;
+
 	/* save cx in the pci struct for later use */
 	pci_set_drvdata(dev, cx);
 
@@ -830,6 +830,7 @@ free_map:
 free_mem:
 	release_mem_region(cx->base_addr, CX18_MEM_SIZE);
 free_workqueue:
+	destroy_workqueue(cx->work_queue);
 err:
 	if (retval == 0)
 		retval = -ENODEV;
@@ -938,6 +939,8 @@ static void cx18_remove(struct pci_dev *pci_dev)
 
 	cx18_cancel_epu_work_orders(cx);
 
+	destroy_workqueue(cx->work_queue);
+
 	cx18_streams_cleanup(cx, 1);
 
 	exit_cx18_i2c(cx);
@@ -979,17 +982,8 @@ static int module_start(void)
 		printk(KERN_INFO "cx18:   Debug value must be >= 0 and <= 511!\n");
 	}
 
-	cx18_work_queue = create_singlethread_workqueue("cx18");
-	if (cx18_work_queue == NULL) {
-		printk(KERN_ERR
-		       "cx18:   Unable to create work hander thread\n");
-		return -ENOMEM;
-	}
-
 	if (pci_register_driver(&cx18_pci_driver)) {
 		printk(KERN_ERR "cx18:   Error detecting PCI card\n");
-		destroy_workqueue(cx18_work_queue);
-		cx18_work_queue = NULL;
 		return -ENODEV;
 	}
 	printk(KERN_INFO "cx18:  End initialization\n");
@@ -1002,9 +996,6 @@ static void module_cleanup(void)
 
 	pci_unregister_driver(&cx18_pci_driver);
 
-	destroy_workqueue(cx18_work_queue);
-	cx18_work_queue = NULL;
-
 	for (i = 0; i < cx18_cards_active; i++) {
 		if (cx18_cards[i] == NULL)
 			continue;

drivers/media/video/cx18/cx18-driver.h

@@ -447,6 +447,7 @@ struct cx18 {
 	u32 sw2_irq_mask;
 	u32 hw2_irq_mask;
 
+	struct workqueue_struct *work_queue;
 	struct cx18_epu_work_order epu_work_order[CX18_MAX_EPU_WORK_ORDERS];
 	char epu_debug_str[256]; /* CX18_EPU_DEBUG is rare: use shared space */
 
@@ -478,7 +479,6 @@ extern struct cx18 *cx18_cards[];
 extern int cx18_cards_active;
 extern int cx18_first_minor;
 extern spinlock_t cx18_cards_lock;
-extern struct workqueue_struct *cx18_work_queue;
 
 /*==============Prototypes==================*/
 

drivers/media/video/cx18/cx18-mailbox.c

@@ -454,7 +454,7 @@ void cx18_api_epu_cmd_irq(struct cx18 *cx, int rpu)
 	 */
 	submit = epu_cmd_irq(cx, order);
 	if (submit > 0) {
-		queue_work(cx18_work_queue, &order->work);
+		queue_work(cx->work_queue, &order->work);
 	}
 }