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| author | Jackson Lee <jackson.lee@chipsnmedia.com> | 2026-06-26 10:22:26 +0900 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2026-07-17 12:36:48 +0200 |
| commit | 1551386934ad43d934c3bb7317929207e1edcd6a (patch) | |
| tree | fcd9744acbf3e626f015e24f4f87c199013004a9 /drivers | |
| parent | 9df2fbe563194da1967a5db083442186c1323efe (diff) | |
| download | linux-next-1551386934ad43d934c3bb7317929207e1edcd6a.tar.gz linux-next-1551386934ad43d934c3bb7317929207e1edcd6a.zip | |
media: chips-media: wave5: Guard bit depth check with initial_info_obtained
When CAPTURE STREAMON is called before the VPU has completed sequence
initialization (initial_info_obtained == false), the initial_info fields
contain uninitialized data. The driver checks
luma_bitdepth and rejects anything other than 8-bit, so garbage values
(e.g. 15) cause STREAMON to fail spuriously.
This is reproducible with the following multi-threaded test scenario:
1. Allocate 2 CAPTURE buffers.
2. Call STREAMON on the CAPTURE queue.
3. Call DQBUF, which blocks waiting for a decoded frame.
4. A second thread calls STREAMOFF on the CAPTURE queue.
5. The blocked DQBUF should be released, allowing graceful termination.
At step 2, STREAMON reads uninitialized luma_bitdepth and rejects the
stream, causing the test to fail.
Fix this by checking initial_info_obtained before accessing the bit
depth fields, so the validation is only performed when the sequence
info has actually been parsed by the VPU.
Fixes: 035371c9e509 ("media: chips-media: wave5: Fix timeout while testing 10bit hevc fluster")
Cc: stable@vger.kernel.org
Signed-off-by: Jackson Lee <jackson.lee@chipsnmedia.com>
Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c index bb2ba9204a83..01d1368b2965 100644 --- a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c +++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c @@ -1403,6 +1403,7 @@ static int wave5_vpu_dec_start_streaming(struct vb2_queue *q, unsigned int count } else if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) { struct dec_initial_info *initial_info = &inst->codec_info->dec_info.initial_info; + struct dec_info *p_dec_info = &inst->codec_info->dec_info; if (inst->state == VPU_INST_STATE_STOP) ret = switch_state(inst, VPU_INST_STATE_INIT_SEQ); @@ -1410,6 +1411,7 @@ static int wave5_vpu_dec_start_streaming(struct vb2_queue *q, unsigned int count goto return_buffers; if (inst->state == VPU_INST_STATE_INIT_SEQ && + p_dec_info->initial_info_obtained && inst->dev->product_code == WAVE521C_CODE) { if (initial_info->luma_bitdepth != 8) { dev_info(inst->dev->dev, "%s: no support for %d bit depth", @@ -1418,7 +1420,6 @@ static int wave5_vpu_dec_start_streaming(struct vb2_queue *q, unsigned int count goto return_buffers; } } - } pm_runtime_put_autosuspend(inst->dev->dev); return ret; |