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Message-ID: <CAG3jFyu9QoXAsAxXx-YWhBCxk_jHOWKc10rL7o051Ehav+e4Kg@mail.gmail.com>
Date: Tue, 31 Aug 2021 21:11:32 +0200
From: Robert Foss <robert.foss@...aro.org>
To: trix@...hat.com
Cc: Todor Tomov <todor.too@...il.com>, Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media <linux-media@...r.kernel.org>,
MSM <linux-arm-msm@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: camss: vfe: simplify vfe_get_wm_sizes()
Hey Tom,
Thanks for the patch!
On Wed, 18 Aug 2021 at 21:41, <trix@...hat.com> wrote:
>
> From: Tom Rix <trix@...hat.com>
>
> Static analysis reports this representative problem
> camss-vfe-4-1.c:333: The result of the left shift is undefined because
> the left operand is negative
> reg |= (height - 1) << 4;
> ~~~~~~~~~ ^
>
> The is a false positive. height is set in vfe_get_wm_sizes() which
> has a switch statement without a default.
>
> Reviewing the switch, the cases contain redundant assignments.
> So simplify to assignments.
>
> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
> .../media/platform/qcom/camss/camss-vfe-4-1.c | 20 ++++++-------------
> .../media/platform/qcom/camss/camss-vfe-4-7.c | 10 +++-------
> .../media/platform/qcom/camss/camss-vfe-4-8.c | 9 +++------
> 3 files changed, 12 insertions(+), 27 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
> index 7b7c9a0aaab282..42047b11ba529e 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe-4-1.c
> @@ -290,22 +290,14 @@ static void vfe_wm_frame_based(struct vfe_device *vfe, u8 wm, u8 enable)
> static void vfe_get_wm_sizes(struct v4l2_pix_format_mplane *pix, u8 plane,
> u16 *width, u16 *height, u16 *bytesperline)
> {
> - switch (pix->pixelformat) {
> - case V4L2_PIX_FMT_NV12:
> - case V4L2_PIX_FMT_NV21:
> - *width = pix->width;
> - *height = pix->height;
> - *bytesperline = pix->plane_fmt[0].bytesperline;
> + *width = pix->width;
> + *height = pix->height;
> + *bytesperline = pix->plane_fmt[0].bytesperline;
> +
> + if (pix->pixelformat == V4L2_PIX_FMT_NV12 ||
> + pix->pixelformat == V4L2_PIX_FMT_NV21)
> if (plane == 1)
> *height /= 2;
> - break;
> - case V4L2_PIX_FMT_NV16:
> - case V4L2_PIX_FMT_NV61:
> - *width = pix->width;
> - *height = pix->height;
> - *bytesperline = pix->plane_fmt[0].bytesperline;
> - break;
> - }
> }
>
> static void vfe_wm_line_based(struct vfe_device *vfe, u32 wm,
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
> index 2836b12ec98915..ab2d57bdf5e71c 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe-4-7.c
> @@ -370,30 +370,26 @@ static int vfe_word_per_line_by_bytes(u32 bytes_per_line)
> static void vfe_get_wm_sizes(struct v4l2_pix_format_mplane *pix, u8 plane,
> u16 *width, u16 *height, u16 *bytesperline)
> {
> + *width = pix->width;
> + *height = pix->height;
> +
> switch (pix->pixelformat) {
> case V4L2_PIX_FMT_NV12:
> case V4L2_PIX_FMT_NV21:
> - *width = pix->width;
> - *height = pix->height;
> *bytesperline = pix->plane_fmt[0].bytesperline;
> if (plane == 1)
> *height /= 2;
> break;
> case V4L2_PIX_FMT_NV16:
> case V4L2_PIX_FMT_NV61:
> - *width = pix->width;
> - *height = pix->height;
> *bytesperline = pix->plane_fmt[0].bytesperline;
> break;
> case V4L2_PIX_FMT_YUYV:
> case V4L2_PIX_FMT_YVYU:
> case V4L2_PIX_FMT_VYUY:
> case V4L2_PIX_FMT_UYVY:
> - *width = pix->width;
> - *height = pix->height;
> *bytesperline = pix->plane_fmt[plane].bytesperline;
> break;
> -
> }
> }
>
> diff --git a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
> index 19519234f727c1..7e6b62c930ac8a 100644
> --- a/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
> +++ b/drivers/media/platform/qcom/camss/camss-vfe-4-8.c
> @@ -343,27 +343,24 @@ static int vfe_word_per_line_by_bytes(u32 bytes_per_line)
> static void vfe_get_wm_sizes(struct v4l2_pix_format_mplane *pix, u8 plane,
> u16 *width, u16 *height, u16 *bytesperline)
> {
> + *width = pix->width;
> + *height = pix->height;
> +
> switch (pix->pixelformat) {
> case V4L2_PIX_FMT_NV12:
> case V4L2_PIX_FMT_NV21:
> - *width = pix->width;
> - *height = pix->height;
> *bytesperline = pix->plane_fmt[0].bytesperline;
> if (plane == 1)
> *height /= 2;
> break;
> case V4L2_PIX_FMT_NV16:
> case V4L2_PIX_FMT_NV61:
> - *width = pix->width;
> - *height = pix->height;
> *bytesperline = pix->plane_fmt[0].bytesperline;
> break;
> case V4L2_PIX_FMT_YUYV:
> case V4L2_PIX_FMT_YVYU:
> case V4L2_PIX_FMT_VYUY:
> case V4L2_PIX_FMT_UYVY:
> - *width = pix->width;
> - *height = pix->height;
> *bytesperline = pix->plane_fmt[plane].bytesperline;
> break;
> }
Reviewed-by: Robert Foss <robert.foss@...aro.org>
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