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| author | Ian Armstrong <ian@iarmst.demon.co.uk> | 2008-10-09 12:04:23 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-10-13 09:08:30 -0200 |
| commit | 2bd7ac55c31cb4f42e331d69dde9fc034a68944f (patch) | |
| tree | c2547fc93abd5e35a33ed6876faa3b3d724f4c23 /drivers/media/video/ivtv/ivtv-irq.c | |
| parent | ec9faa1cfac1dd64a2a865dc7c577f3d483656bd (diff) | |
| download | blackbird-op-linux-2bd7ac55c31cb4f42e331d69dde9fc034a68944f.tar.gz blackbird-op-linux-2bd7ac55c31cb4f42e331d69dde9fc034a68944f.zip | |
V4L/DVB (9166): ivtv - Fix potential race condition in yuv handler
Modified yuv register update handling to remove a potential race condition
which could occur with the first video frame.
Also removed a forced yuv position update, since changing the source video
dimensions or interlace settings doesn't affect the frame already being
displayed.
Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/ivtv/ivtv-irq.c')
| -rw-r--r-- | drivers/media/video/ivtv/ivtv-irq.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c index 34f3ab827858..f5d00ec5da73 100644 --- a/drivers/media/video/ivtv/ivtv-irq.c +++ b/drivers/media/video/ivtv/ivtv-irq.c @@ -753,7 +753,7 @@ static void ivtv_irq_vsync(struct ivtv *itv) */ unsigned int frame = read_reg(0x28c0) & 1; struct yuv_playback_info *yi = &itv->yuv_info; - int last_dma_frame = atomic_read(&itv->yuv_info.next_dma_frame); + int last_dma_frame = atomic_read(&yi->next_dma_frame); struct yuv_frame_info *f = &yi->new_frame_info[last_dma_frame]; if (0) IVTV_DEBUG_IRQ("DEC VSYNC\n"); @@ -772,6 +772,7 @@ static void ivtv_irq_vsync(struct ivtv *itv) next_dma_frame = (next_dma_frame + 1) % IVTV_YUV_BUFFERS; atomic_set(&yi->next_dma_frame, next_dma_frame); yi->fields_lapsed = -1; + yi->running = 1; } } } @@ -804,9 +805,11 @@ static void ivtv_irq_vsync(struct ivtv *itv) } /* Check if we need to update the yuv registers */ - if ((yi->yuv_forced_update || f->update) && last_dma_frame != -1) { + if (yi->running && (yi->yuv_forced_update || f->update)) { if (!f->update) { - last_dma_frame = (u8)(last_dma_frame - 1) % IVTV_YUV_BUFFERS; + last_dma_frame = + (u8)(atomic_read(&yi->next_dma_frame) - + 1) % IVTV_YUV_BUFFERS; f = &yi->new_frame_info[last_dma_frame]; } |
