[Devel] [PATCH] kthread: saa7134-tvaudio.c

[Sukadev Bhattiprolu]

Replace kernel_thread() with kthread_run() since kernel_thread()
is deprecated in drivers/modules. 

Note that this driver, like a few others, allows SIGTERM. Not
sure if that is affected by conversion to kthread. Appreciate
any comments on that.

Signed-off-by: Sukadev Bhattiprolu <sukadev at us.ibm.com>
Cc: Cedric Le Goater <clg at fr.ibm.com>
Cc: Dave Hansen <haveblue at us.ibm.com>
Cc: Serge Hallyn <serue at us.ibm.com>
Cc: Containers at lists.osdl.org
Cc: Gerd Knorr <kraxel at bytesex.org>

 drivers/media/video/saa7134/saa7134-tvaudio.c |   33 ++++++++++++--------------
 drivers/media/video/saa7134/saa7134.h         |    4 ---
 2 files changed, 17 insertions(+), 20 deletions(-)

Index: lx26-18-rc5/drivers/media/video/saa7134/saa7134.h
===================================================================
--- lx26-18-rc5.orig/drivers/media/video/saa7134/saa7134.h	2006-08-29 14:02:44.000000000 -0700
+++ lx26-18-rc5/drivers/media/video/saa7134/saa7134.h	2006-08-29 14:04:21.000000000 -0700
@@ -311,10 +311,8 @@ struct saa7134_pgtable {
 
 /* tvaudio thread status */
 struct saa7134_thread {
-	pid_t                      pid;
-	struct completion          exit;
+	struct task_struct *       task;
 	wait_queue_head_t          wq;
-	unsigned int               shutdown;
 	unsigned int               scan1;
 	unsigned int               scan2;
 	unsigned int               mode;
Index: lx26-18-rc5/drivers/media/video/saa7134/saa7134-tvaudio.c
===================================================================
--- lx26-18-rc5.orig/drivers/media/video/saa7134/saa7134-tvaudio.c	2006-08-29 14:02:44.000000000 -0700
+++ lx26-18-rc5/drivers/media/video/saa7134/saa7134-tvaudio.c	2006-08-29 14:06:24.000000000 -0700
@@ -28,6 +28,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/smp_lock.h>
+#include <linux/kthread.h>
 #include <asm/div64.h>
 
 #include "saa7134-reg.h"
@@ -357,7 +358,7 @@ static int tvaudio_sleep(struct saa7134_
 	DECLARE_WAITQUEUE(wait, current);
 
 	add_wait_queue(&dev->thread.wq, &wait);
-	if (dev->thread.scan1 == dev->thread.scan2 && !dev->thread.shutdown) {
+	if (dev->thread.scan1 == dev->thread.scan2 && !kthread_should_stop()) {
 		if (timeout < 0) {
 			set_current_state(TASK_INTERRUPTIBLE);
 			schedule();
@@ -525,7 +526,7 @@ static int tvaudio_thread(void *data)
 	allow_signal(SIGTERM);
 	for (;;) {
 		tvaudio_sleep(dev,-1);
-		if (dev->thread.shutdown || signal_pending(current))
+		if (kthread_should_stop() || signal_pending(current))
 			goto done;
 
 	restart:
@@ -633,7 +634,7 @@ static int tvaudio_thread(void *data)
 		for (;;) {
 			if (tvaudio_sleep(dev,5000))
 				goto restart;
-			if (dev->thread.shutdown || signal_pending(current))
+			if (kthread_should_stop() || signal_pending(current))
 				break;
 			if (UNSET == dev->thread.mode) {
 				rx = tvaudio_getstereo(dev,&tvaudio[i]);
@@ -649,7 +650,6 @@ static int tvaudio_thread(void *data)
 	}
 
  done:
-	complete_and_exit(&dev->thread.exit, 0);
 	return 0;
 }
 
@@ -798,7 +798,6 @@ static int tvaudio_thread_ddep(void *dat
 	struct saa7134_dev *dev = data;
 	u32 value, norms, clock;
 
-	daemonize("%s", dev->name);
 	allow_signal(SIGTERM);
 
 	clock = saa7134_boards[dev->board].audio_clock;
@@ -812,7 +811,7 @@ static int tvaudio_thread_ddep(void *dat
 
 	for (;;) {
 		tvaudio_sleep(dev,-1);
-		if (dev->thread.shutdown || signal_pending(current))
+		if (kthread_should_stop() || signal_pending(current))
 			goto done;
 
 	restart:
@@ -894,7 +893,6 @@ static int tvaudio_thread_ddep(void *dat
 	}
 
  done:
-	complete_and_exit(&dev->thread.exit, 0);
 	return 0;
 }
 
@@ -1004,15 +1002,16 @@ int saa7134_tvaudio_init2(struct saa7134
 		break;
 	}
 
-	dev->thread.pid = -1;
+	dev->thread.task = NULL;
 	if (my_thread) {
 		/* start tvaudio thread */
 		init_waitqueue_head(&dev->thread.wq);
-		init_completion(&dev->thread.exit);
-		dev->thread.pid = kernel_thread(my_thread,dev,0);
-		if (dev->thread.pid < 0)
+		dev->thread.task = kthread_run(my_thread,dev,dev->name);
+		if (IS_ERR(dev->thread.task)) {
 			printk(KERN_WARNING "%s: kernel_thread() failed\n",
-			       dev->name);
+			                              dev->name);
+			dev->thread.task = NULL;
+		}
 		saa7134_tvaudio_do_scan(dev);
 	}
 
@@ -1023,10 +1022,10 @@ int saa7134_tvaudio_init2(struct saa7134
 int saa7134_tvaudio_fini(struct saa7134_dev *dev)
 {
 	/* shutdown tvaudio thread */
-	if (dev->thread.pid >= 0) {
-		dev->thread.shutdown = 1;
-		wake_up_interruptible(&dev->thread.wq);
-		wait_for_completion(&dev->thread.exit);
+	if (dev->thread.task) {
+		/* kthread_stop() wakes up the thread */
+		kthread_stop(dev->thread.task);
+		dev->thread.task = NULL;
 	}
 	saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x07, 0x00); /* LINE1 */
 	return 0;
@@ -1034,7 +1033,7 @@ int saa7134_tvaudio_fini(struct saa7134_
 
 int saa7134_tvaudio_do_scan(struct saa7134_dev *dev)
 {
-	if (dev->thread.pid >= 0) {
+	if (dev->thread.task) {
 		dev->thread.mode = UNSET;
 		dev->thread.scan2++;
 		wake_up_interruptible(&dev->thread.wq);
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