From 39a96b4cf592e79aefd1b4f2b136c20ec7bf10a7 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@redhat.com>
Date: Sat, 9 Oct 2010 15:53:58 -0300
Subject: [media] em28xx-audio: fix some locking issues

Those locking issues affect tvtime, causing a kernel oops/panic, due to
a race condition.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
 drivers/media/video/em28xx/em28xx.h | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

(limited to 'drivers/media/video/em28xx/em28xx.h')

diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index 1c61a6b65d28..adb20eb6d902 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -25,12 +25,13 @@
 #ifndef _EM28XX_H
 #define _EM28XX_H
 
+#include <linux/workqueue.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
 #include <linux/videodev2.h>
+
 #include <media/videobuf-vmalloc.h>
 #include <media/v4l2-device.h>
-
-#include <linux/i2c.h>
-#include <linux/mutex.h>
 #include <media/ir-kbd-i2c.h>
 #include <media/ir-core.h>
 #if defined(CONFIG_VIDEO_EM28XX_DVB) || defined(CONFIG_VIDEO_EM28XX_DVB_MODULE)
@@ -184,11 +185,6 @@ enum em28xx_mode {
 	EM28XX_DIGITAL_MODE,
 };
 
-enum em28xx_stream_state {
-	STREAM_OFF,
-	STREAM_INTERRUPT,
-	STREAM_ON,
-};
 
 struct em28xx;
 
@@ -463,7 +459,6 @@ struct em28xx_audio {
 	struct snd_card            *sndcard;
 
 	int users;
-	enum em28xx_stream_state capture_stream;
 	spinlock_t slock;
 };
 
@@ -505,6 +500,10 @@ struct em28xx {
 	unsigned int has_audio_class:1;
 	unsigned int has_alsa_audio:1;
 
+	/* Controls audio streaming */
+	struct work_struct wq_trigger;              /* Trigger to start/stop audio for alsa module */
+	 atomic_t       stream_started;      /* stream should be running if true */
+
 	struct em28xx_fmt *format;
 
 	struct em28xx_IR *ir;
-- 
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