* [PATCH 04/11] media: sun6i-csi: add a missing return code
2021-06-16 12:28 [PATCH 00/11] Address some smatch warnings Mauro Carvalho Chehab
@ 2021-06-16 12:28 ` Mauro Carvalho Chehab
2021-06-17 5:37 ` yong
2021-06-16 12:28 ` [PATCH 11/11] media: xilinx: simplify get fourcc logic Mauro Carvalho Chehab
1 sibling, 1 reply; 4+ messages in thread
From: Mauro Carvalho Chehab @ 2021-06-16 12:28 UTC (permalink / raw)
Cc: linuxarm, mauro.chehab, Mauro Carvalho Chehab, Chen-Yu Tsai,
Jernej Skrabec, Mauro Carvalho Chehab, Maxime Ripard, Yong Deng,
linux-arm-kernel, linux-kernel, linux-media, linux-sunxi
As pointed by smatch, there's a missing return code:
drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c:485 sun6i_video_open() warn: missing error code 'ret'
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
index 3181d0781b61..07b2161392d2 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_video.c
@@ -481,8 +481,10 @@ static int sun6i_video_open(struct file *file)
goto fh_release;
/* check if already powered */
- if (!v4l2_fh_is_singular_file(file))
+ if (!v4l2_fh_is_singular_file(file)) {
+ ret = -EBUSY;
goto unlock;
+ }
ret = sun6i_csi_set_power(video->csi, true);
if (ret < 0)
--
2.31.1
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* [PATCH 11/11] media: xilinx: simplify get fourcc logic
2021-06-16 12:28 [PATCH 00/11] Address some smatch warnings Mauro Carvalho Chehab
2021-06-16 12:28 ` [PATCH 04/11] media: sun6i-csi: add a missing return code Mauro Carvalho Chehab
@ 2021-06-16 12:28 ` Mauro Carvalho Chehab
1 sibling, 0 replies; 4+ messages in thread
From: Mauro Carvalho Chehab @ 2021-06-16 12:28 UTC (permalink / raw)
Cc: linuxarm, mauro.chehab, Mauro Carvalho Chehab, Hyun Kwon,
Laurent Pinchart, Mauro Carvalho Chehab, Michal Simek,
linux-arm-kernel, linux-kernel, linux-media
Right now, there are two calls for xvip_get_format_by_fourcc().
If the first one fails, it is called again in order to pick
the first available format: V4L2_PIX_FMT_YUYV.
This ends by producing a smatch warnings:
drivers/media/platform/xilinx/xilinx-dma.c:555 __xvip_dma_try_format() error: 'info' dereferencing possible ERR_PTR()
drivers/media/platform/xilinx/xilinx-dma.c: drivers/media/platform/xilinx/xilinx-dma.c:664 xvip_dma_init() error: 'dma->fmtinfo' dereferencing possible ERR_PTR()
as it is hard for an static analyzer to ensure that calling
xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT) won't return an
error.
So, better to optimize the logic, ensuring that the function
will never return an error.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
drivers/media/platform/xilinx/xilinx-dma.c | 5 +----
drivers/media/platform/xilinx/xilinx-vip.c | 6 +++---
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/media/platform/xilinx/xilinx-dma.c b/drivers/media/platform/xilinx/xilinx-dma.c
index 2a56201cb853..338c3661d809 100644
--- a/drivers/media/platform/xilinx/xilinx-dma.c
+++ b/drivers/media/platform/xilinx/xilinx-dma.c
@@ -26,7 +26,6 @@
#include "xilinx-vip.h"
#include "xilinx-vipp.h"
-#define XVIP_DMA_DEF_FORMAT V4L2_PIX_FMT_YUYV
#define XVIP_DMA_DEF_WIDTH 1920
#define XVIP_DMA_DEF_HEIGHT 1080
@@ -549,8 +548,6 @@ __xvip_dma_try_format(struct xvip_dma *dma, struct v4l2_pix_format *pix,
* requested format isn't supported.
*/
info = xvip_get_format_by_fourcc(pix->pixelformat);
- if (IS_ERR(info))
- info = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
pix->pixelformat = info->fourcc;
pix->field = V4L2_FIELD_NONE;
@@ -660,7 +657,7 @@ int xvip_dma_init(struct xvip_composite_device *xdev, struct xvip_dma *dma,
INIT_LIST_HEAD(&dma->queued_bufs);
spin_lock_init(&dma->queued_lock);
- dma->fmtinfo = xvip_get_format_by_fourcc(XVIP_DMA_DEF_FORMAT);
+ dma->fmtinfo = xvip_get_format_by_fourcc(V4L2_PIX_FMT_YUYV);
dma->format.pixelformat = dma->fmtinfo->fourcc;
dma->format.colorspace = V4L2_COLORSPACE_SRGB;
dma->format.field = V4L2_FIELD_NONE;
diff --git a/drivers/media/platform/xilinx/xilinx-vip.c b/drivers/media/platform/xilinx/xilinx-vip.c
index 6ad61b08a31a..a4eb57683411 100644
--- a/drivers/media/platform/xilinx/xilinx-vip.c
+++ b/drivers/media/platform/xilinx/xilinx-vip.c
@@ -70,8 +70,8 @@ EXPORT_SYMBOL_GPL(xvip_get_format_by_code);
* @fourcc: the format 4CC
*
* Return: a pointer to the format information structure corresponding to the
- * given V4L2 format @fourcc, or ERR_PTR if no corresponding format can be
- * found.
+ * given V4L2 format @fourcc. If not found, return a pointer to the first
+ * available format (V4L2_PIX_FMT_YUYV).
*/
const struct xvip_video_format *xvip_get_format_by_fourcc(u32 fourcc)
{
@@ -84,7 +84,7 @@ const struct xvip_video_format *xvip_get_format_by_fourcc(u32 fourcc)
return format;
}
- return ERR_PTR(-EINVAL);
+ return &xvip_video_formats[0];
}
EXPORT_SYMBOL_GPL(xvip_get_format_by_fourcc);
--
2.31.1
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