[PATCH 0/2] media: Fix build warnings with gcc-11

[PATCH 0/2] media: Fix build warnings with gcc-11

[Ricardo Ribalda]

gcc-11 throws some warnings, most of them are false positive... but with
a simple refactor the code looks nicer and the warnings are gone.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
Ricardo Ribalda (2):
      media: nxp: imx8-isi: Factor out a variable
      media: usb: s2255: Refactor s2255_get_fx2fw

 drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c | 8 +++-----
 drivers/media/usb/s2255/s2255drv.c                | 7 ++++---
 2 files changed, 7 insertions(+), 8 deletions(-)
---
base-commit: 615d300648869c774bd1fe54b4627bb0c20faed4
change-id: 20240128-gcc-11-warnings-15da5f29885f

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>


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[PATCH 1/2] media: nxp: imx8-isi: Factor out a variable

[Ricardo Ribalda]

gcc-11 seems to believe that coffs can be used uninitialized. Refactor
the code and remove the csen variable to convince gcc that we are doing
a good job.

drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:218:20: warning: 'coeffs' may be used uninitialized in this function [-Wmaybe-uninitialized]

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
index 19e80b95ffea..5623914f95e6 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
@@ -215,8 +215,7 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
 		[MXC_ISI_ENC_RGB] = "RGB",
 		[MXC_ISI_ENC_YUV] = "YUV",
 	};
-	const u32 *coeffs;
-	bool cscen = true;
+	const u32 *coeffs = NULL;
 	u32 val;
 
 	val = mxc_isi_read(pipe, CHNL_IMG_CTRL);
@@ -235,14 +234,13 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
 		val |= CHNL_IMG_CTRL_CSC_MODE(CHNL_IMG_CTRL_CSC_MODE_RGB2YCBCR);
 	} else {
 		/* Bypass CSC */
-		cscen = false;
 		val |= CHNL_IMG_CTRL_CSC_BYPASS;
 	}
 
 	dev_dbg(pipe->isi->dev, "CSC: %s -> %s\n",
 		encodings[in_encoding], encodings[out_encoding]);
 
-	if (cscen) {
+	if (coeffs) {
 		mxc_isi_write(pipe, CHNL_CSC_COEFF0, coeffs[0]);
 		mxc_isi_write(pipe, CHNL_CSC_COEFF1, coeffs[1]);
 		mxc_isi_write(pipe, CHNL_CSC_COEFF2, coeffs[2]);
@@ -253,7 +251,7 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
 
 	mxc_isi_write(pipe, CHNL_IMG_CTRL, val);
 
-	*bypass = !cscen;
+	*bypass = !coeffs;
 }
 
 void mxc_isi_channel_set_alpha(struct mxc_isi_pipe *pipe, u8 alpha)

-- 
2.43.0.429.g432eaa2c6b-goog


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[PATCH 2/2] media: usb: s2255: Refactor s2255_get_fx2fw

[Ricardo Ribalda]

Resize the buffer to the actual size needed and initialize it. With this
we can convince gcc-11 that the variable is not used uninitialized.

drivers/media/usb/s2255/s2255drv.c:1914:25: warning: 'transBuffer' may be used uninitialized [-Wmaybe-uninitialized]

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/s2255/s2255drv.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/s2255/s2255drv.c b/drivers/media/usb/s2255/s2255drv.c
index 3c2627712fe9..8e1de1e8bd12 100644
--- a/drivers/media/usb/s2255/s2255drv.c
+++ b/drivers/media/usb/s2255/s2255drv.c
@@ -1906,9 +1906,10 @@ static int s2255_get_fx2fw(struct s2255_dev *dev)
 {
 	int fw;
 	int ret;
-	unsigned char transBuffer[64];
-	ret = s2255_vendor_req(dev, S2255_VR_FW, 0, 0, transBuffer, 2,
-			       S2255_VR_IN);
+	u8 transBuffer[2] = {};
+
+	ret = s2255_vendor_req(dev, S2255_VR_FW, 0, 0, transBuffer,
+			       sizeof(transBuffer), S2255_VR_IN);
 	if (ret < 0)
 		dprintk(dev, 2, "get fw error: %x\n", ret);
 	fw = transBuffer[0] + (transBuffer[1] << 8);

-- 
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Re: [PATCH 1/2] media: nxp: imx8-isi: Factor out a variable

[Laurent Pinchart]

Hi Ricardo,

Thank you for the patch.

On Sun, Jan 28, 2024 at 04:13:56PM +0000, Ricardo Ribalda wrote:
> gcc-11 seems to believe that coffs can be used uninitialized. Refactor

s/coffs/coeffs/

> the code and remove the csen variable to convince gcc that we are doing

s/csen/cscen/

> a good job.
> 
> drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c:218:20: warning: 'coeffs' may be used uninitialized in this function [-Wmaybe-uninitialized]
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

> ---
>  drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
> index 19e80b95ffea..5623914f95e6 100644
> --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
> +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-hw.c
> @@ -215,8 +215,7 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
>  		[MXC_ISI_ENC_RGB] = "RGB",
>  		[MXC_ISI_ENC_YUV] = "YUV",
>  	};
> -	const u32 *coeffs;
> -	bool cscen = true;
> +	const u32 *coeffs = NULL;
>  	u32 val;
>  
>  	val = mxc_isi_read(pipe, CHNL_IMG_CTRL);
> @@ -235,14 +234,13 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
>  		val |= CHNL_IMG_CTRL_CSC_MODE(CHNL_IMG_CTRL_CSC_MODE_RGB2YCBCR);
>  	} else {
>  		/* Bypass CSC */
> -		cscen = false;
>  		val |= CHNL_IMG_CTRL_CSC_BYPASS;
>  	}
>  
>  	dev_dbg(pipe->isi->dev, "CSC: %s -> %s\n",
>  		encodings[in_encoding], encodings[out_encoding]);
>  
> -	if (cscen) {
> +	if (coeffs) {
>  		mxc_isi_write(pipe, CHNL_CSC_COEFF0, coeffs[0]);
>  		mxc_isi_write(pipe, CHNL_CSC_COEFF1, coeffs[1]);
>  		mxc_isi_write(pipe, CHNL_CSC_COEFF2, coeffs[2]);
> @@ -253,7 +251,7 @@ static void mxc_isi_channel_set_csc(struct mxc_isi_pipe *pipe,
>  
>  	mxc_isi_write(pipe, CHNL_IMG_CTRL, val);
>  
> -	*bypass = !cscen;
> +	*bypass = !coeffs;
>  }
>  
>  void mxc_isi_channel_set_alpha(struct mxc_isi_pipe *pipe, u8 alpha)
> 

-- 
Regards,

Laurent Pinchart

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