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Subject[RFC PATCH v2 03/13] media: mtk-vcodec: vdec: clean up vidioc_vdec_s_fmt a bit
Date
Check for a potentially NULL pointer that was overlooked and use shorter
accessors to the same data. While we are at it, sprinkle a few comments.

Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
---
.../media/platform/mtk-vcodec/mtk_vcodec_dec.c | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
index 653f111532ab..858727824889 100644
--- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
+++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
@@ -841,12 +841,20 @@ static int vidioc_vdec_s_fmt(struct file *file, void *priv,
return -EINVAL;

pix_mp = &f->fmt.pix_mp;
+ /*
+ * Setting OUTPUT format after OUTPUT buffers are allocated is invalid
+ * if using the stateful API.
+ */
if ((f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) &&
vb2_is_busy(&ctx->m2m_ctx->out_q_ctx.q)) {
mtk_v4l2_err("out_q_ctx buffers already requested");
ret = -EBUSY;
}

+ /*
+ * Setting CAPTURE format after CAPTURE buffers are allocated is
+ * invalid.
+ */
if ((f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) &&
vb2_is_busy(&ctx->m2m_ctx->cap_q_ctx.q)) {
mtk_v4l2_err("cap_q_ctx buffers already requested");
@@ -865,6 +873,8 @@ static int vidioc_vdec_s_fmt(struct file *file, void *priv,
fmt = mtk_vdec_find_format(f);
}
}
+ if (fmt == NULL)
+ return -EINVAL;

q_data->fmt = fmt;
vidioc_try_fmt(f, q_data->fmt);
@@ -873,10 +883,10 @@ static int vidioc_vdec_s_fmt(struct file *file, void *priv,
q_data->coded_width = pix_mp->width;
q_data->coded_height = pix_mp->height;

- ctx->colorspace = f->fmt.pix_mp.colorspace;
- ctx->ycbcr_enc = f->fmt.pix_mp.ycbcr_enc;
- ctx->quantization = f->fmt.pix_mp.quantization;
- ctx->xfer_func = f->fmt.pix_mp.xfer_func;
+ ctx->colorspace = pix_mp->colorspace;
+ ctx->ycbcr_enc = pix_mp->ycbcr_enc;
+ ctx->quantization = pix_mp->quantization;
+ ctx->xfer_func = pix_mp->xfer_func;

if (ctx->state == MTK_STATE_FREE) {
ret = vdec_if_init(ctx, q_data->fmt->fourcc);
--
2.23.0.187.g17f5b7556c-goog
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