From 07b80264c3ede47593e83189cce82b31100053f6 Mon Sep 17 00:00:00 2001 From: Mike Isely Date: Sun, 30 Mar 2008 20:36:31 -0300 Subject: [PATCH] V4L/DVB (7708): pvrusb2-dvb: Fix stuck thread on streaming abort If the device fails to stream, the feed thread will block forever waiting for buffers. But while in this state it was not looking for an exit condition from the driver DVB interface. This caused the thread to jam. Implement a new stop flag (which will be set appropriately) to tell the thread to stop. Signed-off-by: Mike Isely Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/pvrusb2/pvrusb2-dvb.c | 10 ++++++++-- drivers/media/video/pvrusb2/pvrusb2-dvb.h | 1 + 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/media/video/pvrusb2/pvrusb2-dvb.c b/drivers/media/video/pvrusb2/pvrusb2-dvb.c index 58ef5caba83a..d82fceae4689 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-dvb.c +++ b/drivers/media/video/pvrusb2/pvrusb2-dvb.c @@ -41,6 +41,7 @@ static int pvr2_dvb_feed_func(struct pvr2_dvb_adapter *adap) stream = adap->channel.stream->stream; for (;;) { + if (adap->feed_thread_stop) break; if (kthread_should_stop()) break; /* Not sure about this... */ @@ -70,10 +71,12 @@ static int pvr2_dvb_feed_func(struct pvr2_dvb_adapter *adap) } - /* Wait until more buffers become available. */ + /* Wait until more buffers become available or we're + told not to wait any longer. */ ret = wait_event_interruptible( adap->buffer_wait_data, - pvr2_stream_get_ready_count(stream) > 0); + (pvr2_stream_get_ready_count(stream) > 0) || + adap->feed_thread_stop); if (ret < 0) break; } @@ -107,6 +110,8 @@ static void pvr2_dvb_stream_end(struct pvr2_dvb_adapter *adap) struct pvr2_stream *stream; if (adap->thread) { + adap->feed_thread_stop = !0; + pvr2_dvb_notify(adap); kthread_stop(adap->thread); adap->thread = NULL; } @@ -177,6 +182,7 @@ static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap) if (ret < 0) return ret; } + adap->feed_thread_stop = 0; adap->thread = kthread_run(pvr2_dvb_feed_thread, adap, "pvrusb2-dvb"); if (IS_ERR(adap->thread)) { diff --git a/drivers/media/video/pvrusb2/pvrusb2-dvb.h b/drivers/media/video/pvrusb2/pvrusb2-dvb.h index 884ff916a352..2dd0d4ef22a2 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-dvb.h +++ b/drivers/media/video/pvrusb2/pvrusb2-dvb.h @@ -28,6 +28,7 @@ struct pvr2_dvb_adapter { unsigned int stream_run:1; wait_queue_head_t buffer_wait_data; + int feed_thread_stop; char *buffer_storage[PVR2_DVB_BUFFER_COUNT]; }; -- 2.20.1