media: mtk-vcodec: fix access to incorrect planes member

Commit 0650a914 ("media: mtk-vcodec: Correct return type for mem2mem
buffer helpers") fixed the return types for mem2mem buffer helper
functions by changing a few local variables from vb2_buffer to
vb2_v4l2_buffer. However, it left a few accesses to vb2_buffer::planes
as-is, accidentally turning them into accesses to
vb2_v4l2_buffer::planes and resulting in values being read from/written
to the wrong place.

Fix this by inserting vb2_buf into these accesses so they mimic their
original behavior.

Fixes: 0650a914 ("media: mtk-vcodec: Correct return type for mem2mem buffer helpers")
Signed-off-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c

@@ -388,7 +388,7 @@ static void mtk_vdec_worker(struct work_struct *work)
 	}
 	buf.va = vb2_plane_vaddr(&src_buf->vb2_buf, 0);
 	buf.dma_addr = vb2_dma_contig_plane_dma_addr(&src_buf->vb2_buf, 0);
-	buf.size = (size_t)src_buf->planes[0].bytesused;
+	buf.size = (size_t)src_buf->vb2_buf.planes[0].bytesused;
 	if (!buf.va) {
 		v4l2_m2m_job_finish(dev->m2m_dev_dec, ctx->m2m_ctx);
 		mtk_v4l2_err("[%d] id=%d src_addr is NULL!!",
@@ -1155,7 +1155,7 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
 
 	src_mem.va = vb2_plane_vaddr(&src_buf->vb2_buf, 0);
 	src_mem.dma_addr = vb2_dma_contig_plane_dma_addr(&src_buf->vb2_buf, 0);
-	src_mem.size = (size_t)src_buf->planes[0].bytesused;
+	src_mem.size = (size_t)src_buf->vb2_buf.planes[0].bytesused;
 	mtk_v4l2_debug(2,
 			"[%d] buf id=%d va=%p dma=%pad size=%zx",
 			ctx->id, src_buf->vb2_buf.index,

drivers/media/platform/mtk-vcodec/mtk_vcodec_enc.c

@@ -894,7 +894,7 @@ static void vb2ops_venc_stop_streaming(struct vb2_queue *q)
 
 	if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
 		while ((dst_buf = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx))) {
-			dst_buf->planes[0].bytesused = 0;
+			dst_buf->vb2_buf.planes[0].bytesused = 0;
 			v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_ERROR);
 		}
 	} else {
@@ -947,7 +947,7 @@ static int mtk_venc_encode_header(void *priv)
 
 	bs_buf.va = vb2_plane_vaddr(&dst_buf->vb2_buf, 0);
 	bs_buf.dma_addr = vb2_dma_contig_plane_dma_addr(&dst_buf->vb2_buf, 0);
-	bs_buf.size = (size_t)dst_buf->planes[0].length;
+	bs_buf.size = (size_t)dst_buf->vb2_buf.planes[0].length;
 
 	mtk_v4l2_debug(1,
 			"[%d] buf id=%d va=0x%p dma_addr=0x%llx size=%zu",
@@ -976,7 +976,7 @@ static int mtk_venc_encode_header(void *priv)
 	}
 
 	ctx->state = MTK_STATE_HEADER;
-	dst_buf->planes[0].bytesused = enc_result.bs_size;
+	dst_buf->vb2_buf.planes[0].bytesused = enc_result.bs_size;
 	v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_DONE);
 
 	return 0;
@@ -1107,12 +1107,12 @@ static void mtk_venc_worker(struct work_struct *work)
 
 	if (ret) {
 		v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);
-		dst_buf->planes[0].bytesused = 0;
+		dst_buf->vb2_buf.planes[0].bytesused = 0;
 		v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_ERROR);
 		mtk_v4l2_err("venc_if_encode failed=%d", ret);
 	} else {
 		v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_DONE);
-		dst_buf->planes[0].bytesused = enc_result.bs_size;
+		dst_buf->vb2_buf.planes[0].bytesused = enc_result.bs_size;
 		v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_DONE);
 		mtk_v4l2_debug(2, "venc_if_encode bs size=%d",
 				 enc_result.bs_size);