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Message-Id: <20250803135514.118892-1-rongqianfeng@vivo.com>
Date: Sun, 3 Aug 2025 21:55:06 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Tiffany Lin <tiffany.lin@...iatek.com>,
Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
Yunfei Dong <yunfei.dong@...iatek.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Qianfeng Rong <rongqianfeng@...o.com>,
Hans Verkuil <hverkuil@...nel.org>,
Andrzej Pietrasiewicz <andrzejtp2010@...il.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH] media: mediatek: vcodec: use = { } instead of memset()
Based on testing and recommendations by David Lechner et al. [1][2],
using = { } to initialize a structure or array is the preferred way
to do this in the kernel.
This patch converts memset() to = { }, thereby:
- Eliminating the risk of sizeof() mismatches.
- Simplifying the code.
[1]: https://lore.kernel.org/linux-iio/202505090942.48EBF01B@keescook/
[2]: https://lore.kernel.org/lkml/20250614151844.50524610@jic23-huawei/
Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
.../mediatek/vcodec/decoder/vdec/vdec_vp9_if.c | 3 +--
.../mediatek/vcodec/decoder/vdec_vpu_if.c | 12 ++++--------
.../mediatek/vcodec/encoder/mtk_vcodec_enc.c | 6 ++----
.../mediatek/vcodec/encoder/venc_vpu_if.c | 15 +++++----------
4 files changed, 12 insertions(+), 24 deletions(-)
diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c
index eb3354192853..80554b2c26c0 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp9_if.c
@@ -548,10 +548,9 @@ static bool vp9_wait_dec_end(struct vdec_vp9_inst *inst)
static struct vdec_vp9_inst *vp9_alloc_inst(struct mtk_vcodec_dec_ctx *ctx)
{
int result;
- struct mtk_vcodec_mem mem;
+ struct mtk_vcodec_mem mem = { };
struct vdec_vp9_inst *inst;
- memset(&mem, 0, sizeof(mem));
mem.size = sizeof(struct vdec_vp9_inst);
result = mtk_vcodec_mem_alloc(ctx, &mem);
if (result)
diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c
index 145958206e38..d5e943f81c15 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec_vpu_if.c
@@ -181,12 +181,11 @@ static int vcodec_vpu_send_msg(struct vdec_vpu_inst *vpu, void *msg, int len)
static int vcodec_send_ap_ipi(struct vdec_vpu_inst *vpu, unsigned int msg_id)
{
- struct vdec_ap_ipi_cmd msg;
+ struct vdec_ap_ipi_cmd msg = { };
int err = 0;
mtk_vdec_debug(vpu->ctx, "+ id=%X", msg_id);
- memset(&msg, 0, sizeof(msg));
msg.msg_id = msg_id;
if (vpu->fw_abi_version < 2)
msg.vpu_inst_addr = vpu->inst_addr;
@@ -201,7 +200,7 @@ static int vcodec_send_ap_ipi(struct vdec_vpu_inst *vpu, unsigned int msg_id)
int vpu_dec_init(struct vdec_vpu_inst *vpu)
{
- struct vdec_ap_ipi_init msg;
+ struct vdec_ap_ipi_init msg = { };
int err;
init_waitqueue_head(&vpu->wq);
@@ -225,7 +224,6 @@ int vpu_dec_init(struct vdec_vpu_inst *vpu)
}
}
- memset(&msg, 0, sizeof(msg));
msg.msg_id = AP_IPIMSG_DEC_INIT;
msg.ap_inst_addr = (unsigned long)vpu;
msg.codec_type = vpu->codec_type;
@@ -245,7 +243,7 @@ int vpu_dec_init(struct vdec_vpu_inst *vpu)
int vpu_dec_start(struct vdec_vpu_inst *vpu, uint32_t *data, unsigned int len)
{
- struct vdec_ap_ipi_dec_start msg;
+ struct vdec_ap_ipi_dec_start msg = { };
int i;
int err = 0;
@@ -254,7 +252,6 @@ int vpu_dec_start(struct vdec_vpu_inst *vpu, uint32_t *data, unsigned int len)
return -EINVAL;
}
- memset(&msg, 0, sizeof(msg));
msg.msg_id = AP_IPIMSG_DEC_START;
if (vpu->fw_abi_version < 2)
msg.vpu_inst_addr = vpu->inst_addr;
@@ -273,7 +270,7 @@ int vpu_dec_start(struct vdec_vpu_inst *vpu, uint32_t *data, unsigned int len)
int vpu_dec_get_param(struct vdec_vpu_inst *vpu, uint32_t *data,
unsigned int len, unsigned int param_type)
{
- struct vdec_ap_ipi_get_param msg;
+ struct vdec_ap_ipi_get_param msg = { };
int err;
if (len > ARRAY_SIZE(msg.data)) {
@@ -281,7 +278,6 @@ int vpu_dec_get_param(struct vdec_vpu_inst *vpu, uint32_t *data,
return -EINVAL;
}
- memset(&msg, 0, sizeof(msg));
msg.msg_id = AP_IPIMSG_DEC_GET_PARAM;
msg.inst_id = vpu->inst_id;
memcpy(msg.data, data, sizeof(unsigned int) * len);
diff --git a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c
index a01dc25a7699..bc6435a7543f 100644
--- a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c
+++ b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc.c
@@ -1064,7 +1064,7 @@ static int mtk_venc_encode_header(void *priv)
static int mtk_venc_param_change(struct mtk_vcodec_enc_ctx *ctx)
{
- struct venc_enc_param enc_prm;
+ struct venc_enc_param enc_prm = { };
struct vb2_v4l2_buffer *vb2_v4l2 = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
struct mtk_video_enc_buf *mtk_buf;
int ret = 0;
@@ -1075,7 +1075,6 @@ static int mtk_venc_param_change(struct mtk_vcodec_enc_ctx *ctx)
mtk_buf = container_of(vb2_v4l2, struct mtk_video_enc_buf, m2m_buf.vb);
- memset(&enc_prm, 0, sizeof(enc_prm));
if (mtk_buf->param_change == MTK_ENCODE_PARAM_NONE)
return 0;
@@ -1138,7 +1137,7 @@ static void mtk_venc_worker(struct work_struct *work)
struct mtk_vcodec_enc_ctx *ctx = container_of(work, struct mtk_vcodec_enc_ctx,
encode_work);
struct vb2_v4l2_buffer *src_buf, *dst_buf;
- struct venc_frm_buf frm_buf;
+ struct venc_frm_buf frm_buf = { };
struct mtk_vcodec_mem bs_buf;
struct venc_done_result enc_result;
int ret, i;
@@ -1168,7 +1167,6 @@ static void mtk_venc_worker(struct work_struct *work)
return;
}
- memset(&frm_buf, 0, sizeof(frm_buf));
for (i = 0; i < src_buf->vb2_buf.num_planes ; i++) {
frm_buf.fb_addr[i].dma_addr =
vb2_dma_contig_plane_dma_addr(&src_buf->vb2_buf, i);
diff --git a/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c b/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
index 51bb7ee141b9..55627b71348d 100644
--- a/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
+++ b/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
@@ -132,7 +132,7 @@ static int vpu_enc_send_msg(struct venc_vpu_inst *vpu, void *msg,
int vpu_enc_init(struct venc_vpu_inst *vpu)
{
int status;
- struct venc_ap_ipi_msg_init out;
+ struct venc_ap_ipi_msg_init out = { };
init_waitqueue_head(&vpu->wq_hd);
vpu->signaled = 0;
@@ -148,7 +148,6 @@ int vpu_enc_init(struct venc_vpu_inst *vpu)
return -EINVAL;
}
- memset(&out, 0, sizeof(out));
out.msg_id = AP_IPIMSG_ENC_INIT;
out.venc_inst = (unsigned long)vpu;
if (vpu_enc_send_msg(vpu, &out, sizeof(out))) {
@@ -191,11 +190,10 @@ int vpu_enc_set_param(struct venc_vpu_inst *vpu,
size_t msg_size = is_ext ?
sizeof(struct venc_ap_ipi_msg_set_param_ext) :
sizeof(struct venc_ap_ipi_msg_set_param);
- struct venc_ap_ipi_msg_set_param_ext out;
+ struct venc_ap_ipi_msg_set_param_ext out = { };
mtk_venc_debug(vpu->ctx, "id %d ->", id);
- memset(&out, 0, sizeof(out));
out.base.msg_id = AP_IPIMSG_ENC_SET_PARAM;
out.base.vpu_inst_addr = vpu->inst_addr;
out.base.param_id = id;
@@ -258,11 +256,10 @@ static int vpu_enc_encode_32bits(struct venc_vpu_inst *vpu,
size_t msg_size = is_ext ?
sizeof(struct venc_ap_ipi_msg_enc_ext) :
sizeof(struct venc_ap_ipi_msg_enc);
- struct venc_ap_ipi_msg_enc_ext out;
+ struct venc_ap_ipi_msg_enc_ext out = { };
mtk_venc_debug(vpu->ctx, "bs_mode %d ->", bs_mode);
- memset(&out, 0, sizeof(out));
out.base.msg_id = AP_IPIMSG_ENC_ENCODE;
out.base.vpu_inst_addr = vpu->inst_addr;
out.base.bs_mode = bs_mode;
@@ -302,12 +299,11 @@ static int vpu_enc_encode_34bits(struct venc_vpu_inst *vpu,
struct mtk_vcodec_mem *bs_buf,
struct venc_frame_info *frame_info)
{
- struct venc_ap_ipi_msg_enc_ext_34 out;
+ struct venc_ap_ipi_msg_enc_ext_34 out = { };
size_t msg_size = sizeof(struct venc_ap_ipi_msg_enc_ext_34);
mtk_venc_debug(vpu->ctx, "bs_mode %d ->", bs_mode);
- memset(&out, 0, sizeof(out));
out.msg_id = AP_IPIMSG_ENC_ENCODE;
out.vpu_inst_addr = vpu->inst_addr;
out.bs_mode = bs_mode;
@@ -367,9 +363,8 @@ int vpu_enc_encode(struct venc_vpu_inst *vpu, unsigned int bs_mode,
int vpu_enc_deinit(struct venc_vpu_inst *vpu)
{
- struct venc_ap_ipi_msg_deinit out;
+ struct venc_ap_ipi_msg_deinit out = { };
- memset(&out, 0, sizeof(out));
out.msg_id = AP_IPIMSG_ENC_DEINIT;
out.vpu_inst_addr = vpu->inst_addr;
if (vpu_enc_send_msg(vpu, &out, sizeof(out))) {
--
2.34.1
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