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Subject: media: coda: fix macroblocks count control usage Author: Marco Felsch m.felsch@pengutronix.de Date: Fri Mar 5 09:23:54 2021 +0100

Commit b2d3bef1aa78 ("media: coda: Add a V4L2 user for control error macroblocks count") add the control for the decoder devices. But during streamon() this ioctl gets called for all (encoder and decoder) devices and on encoder devices this causes a null pointer exception.

Fix this by setting the control only if it is really accessible.

Fixes: b2d3bef1aa78 ("media: coda: Add a V4L2 user for control error macroblocks count") Signed-off-by: Marco Felsch m.felsch@pengutronix.de Cc: stable@vger.kernel.org Reviewed-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org

drivers/media/platform/coda/coda-common.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

---

diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c index 995e95272e51..e600764dce96 100644 --- a/drivers/media/platform/coda/coda-common.c +++ b/drivers/media/platform/coda/coda-common.c @@ -2062,7 +2062,9 @@ static int coda_start_streaming(struct vb2_queue *q, unsigned int count) if (q_data_dst->fourcc == V4L2_PIX_FMT_JPEG) ctx->params.gop_size = 1; ctx->gopcounter = ctx->params.gop_size - 1; - v4l2_ctrl_s_ctrl(ctx->mb_err_cnt_ctrl, 0); + /* Only decoders have this control */ + if (ctx->mb_err_cnt_ctrl) + v4l2_ctrl_s_ctrl(ctx->mb_err_cnt_ctrl, 0);

ret = ctx->ops->start_streaming(ctx); if (ctx->inst_type == CODA_INST_DECODER) {