V4L/DVB (6330): V4L: saa7134: Fix interaction between tvaudio thread and the freezer

make tvaudio thread freezeable, and add proper support for that

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 24 insertions, 7 deletions

diff --git a/drivers/media/video/saa7134/saa7134-tvaudio.c b/drivers/media/video/saa7134/saa7134-tvaudio.c
index 976318d50828..f8e304c76232 100644
--- a/drivers/media/video/saa7134/saa7134-tvaudio.c
+++ b/drivers/media/video/saa7134/saa7134-tvaudio.c
@@ -27,6 +27,7 @@
 #include <linux/kthread.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/freezer.h>
 #include <asm/div64.h>
 
 #include "saa7134-reg.h"
@@ -502,13 +503,17 @@ static int tvaudio_thread(void *data)
         unsigned int i, audio, nscan;
         int max1,max2,carrier,rx,mode,lastmode,default_carrier;
 
-        allow_signal(SIGTERM);
+
+        set_freezable();
+
         for (;;) {
                 tvaudio_sleep(dev,-1);
-                if (kthread_should_stop() || signal_pending(current))
+                if (kthread_should_stop())
                         goto done;
 
         restart:
+                try_to_freeze();
+
                 dev->thread.scan1 = dev->thread.scan2;
                 dprintk("tvaudio thread scan start [%d]\n",dev->thread.scan1);
                 dev->tvaudio  = NULL;
@@ -612,9 +617,12 @@ static int tvaudio_thread(void *data)
 
                 lastmode = 42;
                 for (;;) {
+
+                        try_to_freeze();
+
                         if (tvaudio_sleep(dev,5000))
                                 goto restart;
-                        if (kthread_should_stop() || signal_pending(current))
+                        if (kthread_should_stop())
                                 break;
                         if (UNSET == dev->thread.mode) {
                                 rx = tvaudio_getstereo(dev,&tvaudio[i]);
@@ -630,6 +638,7 @@ static int tvaudio_thread(void *data)
         }
 
  done:
+        dev->thread.stopped = 1;
         return 0;
 }
 
@@ -777,7 +786,8 @@ static int tvaudio_thread_ddep(void *data)
         struct saa7134_dev *dev = data;
         u32 value, norms, clock;
 
-        allow_signal(SIGTERM);
+
+        set_freezable();
 
         clock = saa7134_boards[dev->board].audio_clock;
         if (UNSET != audio_clock_override)
@@ -790,10 +800,13 @@ static int tvaudio_thread_ddep(void *data)
 
         for (;;) {
                 tvaudio_sleep(dev,-1);
-                if (kthread_should_stop() || signal_pending(current))
+                if (kthread_should_stop())
                         goto done;
 
         restart:
+
+                try_to_freeze();
+
                 dev->thread.scan1 = dev->thread.scan2;
                 dprintk("tvaudio thread scan start [%d]\n",dev->thread.scan1);
 
@@ -870,6 +883,7 @@ static int tvaudio_thread_ddep(void *data)
         }
 
  done:
+        dev->thread.stopped = 1;
         return 0;
 }
 
@@ -997,7 +1011,7 @@ int saa7134_tvaudio_init2(struct saa7134_dev *dev)
 int saa7134_tvaudio_fini(struct saa7134_dev *dev)
 {
         /* shutdown tvaudio thread */
-        if (dev->thread.thread)
+        if (dev->thread.thread && !dev->thread.stopped)
                 kthread_stop(dev->thread.thread);
 
         saa_andorb(SAA7134_ANALOG_IO_SELECT, 0x07, 0x00); /* LINE1 */
@@ -1013,7 +1027,9 @@ int saa7134_tvaudio_do_scan(struct saa7134_dev *dev)
         } else if (dev->thread.thread) {
                 dev->thread.mode = UNSET;
                 dev->thread.scan2++;
-                wake_up_process(dev->thread.thread);
+
+                if (!dev->insuspend && !dev->thread.stopped)
+                        wake_up_process(dev->thread.thread);
         } else {
                 dev->automute = 0;
                 saa7134_tvaudio_setmute(dev);
diff --git a/drivers/media/video/saa7134/saa7134.h b/drivers/media/video/saa7134/saa7134.h
index fe0a8439b878..66a390c321a7 100644
--- a/drivers/media/video/saa7134/saa7134.h
+++ b/drivers/media/video/saa7134/saa7134.h
@@ -333,6 +333,7 @@ struct saa7134_thread {
         unsigned int               scan1;
         unsigned int               scan2;
         unsigned int               mode;
+        unsigned int               stopped;
 };
 
 /* buffer for one video/vbi/ts frame */