linux-kernel - Re: [PATCH v2] drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c: fix error return code

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Date:	Sun, 09 Sep 2012 20:52:56 +0200
From:	walter harms <wharms@....de>
To:	Peter Senna Tschudin <peter.senna@...il.com>
CC:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	kernel-janitors@...r.kernel.org, Julia.Lawall@...6.fr,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c:
 fix error return code


looks ok to me,
note: i do not have the hardware
Reviewed-by: walter harms <wharms@....de>

Am 08.09.2012 16:01, schrieb Peter Senna Tschudin:
> From: Peter Senna Tschudin <peter.senna@...il.com>
> 
> Convert a nonnegative error return code to a negative one, as returned
> elsewhere in the function.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> (
> if@p1 (\(ret < 0\|ret != 0\))
>  { ... return ret; }
> |
> ret@p1 = 0
> )
> ... when != ret = e1
>     when != &ret
> *if(...)
> {
>   ... when != ret = e2
>       when forall
>  return ret;
> }
> 
> // </smpl>
> 
> Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
> 
> ---
> walter harms <wharms@....de>, thanks for the tip. Please take a look carefully to check if I got your suggestion correctly. It was tested by compilation only.
> 
>  drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c |   30 ++++++-----------
>  1 file changed, 12 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c b/drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c
> index c8c94fb..b663dac 100644
> --- a/drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c
> +++ b/drivers/media/pci/cx25821/cx25821-video-upstream-ch2.c
> @@ -704,11 +704,9 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select,
>  {
>  	struct sram_channel *sram_ch;
>  	u32 tmp;
> -	int retval = 0;
>  	int err = 0;
>  	int data_frame_size = 0;
>  	int risc_buffer_size = 0;
> -	int str_length = 0;
>  
>  	if (dev->_is_running_ch2) {
>  		pr_info("Video Channel is still running so return!\n");
> @@ -744,20 +742,16 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select,
>  	risc_buffer_size = dev->_isNTSC_ch2 ?
>  		NTSC_RISC_BUF_SIZE : PAL_RISC_BUF_SIZE;
>  
> -	if (dev->input_filename_ch2) {
> -		str_length = strlen(dev->input_filename_ch2);
> -		dev->_filename_ch2 = kmemdup(dev->input_filename_ch2,
> -					     str_length + 1, GFP_KERNEL);
> -
> -		if (!dev->_filename_ch2)
> -			goto error;
> -	} else {
> -		str_length = strlen(dev->_defaultname_ch2);
> -		dev->_filename_ch2 = kmemdup(dev->_defaultname_ch2,
> -					     str_length + 1, GFP_KERNEL);
> +	if (dev->input_filename_ch2)
> +		dev->_filename_ch2 = kstrdup(dev->input_filename_ch2,
> +								GFP_KERNEL);
> +	else
> +		dev->_filename_ch2 = kstrdup(dev->_defaultname_ch2,
> +								GFP_KERNEL);
>  
> -		if (!dev->_filename_ch2)
> -			goto error;
> +	if (!dev->_filename_ch2) {
> +		err = -ENOENT;
> +		goto error;
>  	}
>  
>  	/* Default if filename is empty string */
> @@ -773,7 +767,7 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select,
>  		}
>  	}
>  
> -	retval = cx25821_sram_channel_setup_upstream(dev, sram_ch,
> +	err = cx25821_sram_channel_setup_upstream(dev, sram_ch,
>  						dev->_line_size_ch2, 0);
>  
>  	/* setup fifo + format */
> @@ -783,9 +777,9 @@ int cx25821_vidupstream_init_ch2(struct cx25821_dev *dev, int channel_select,
>  	dev->upstream_databuf_size_ch2 = data_frame_size * 2;
>  
>  	/* Allocating buffers and prepare RISC program */
> -	retval = cx25821_upstream_buffer_prepare_ch2(dev, sram_ch,
> +	err = cx25821_upstream_buffer_prepare_ch2(dev, sram_ch,
>  						dev->_line_size_ch2);
> -	if (retval < 0) {
> +	if (err < 0) {
>  		pr_err("%s: Failed to set up Video upstream buffers!\n",
>  		       dev->name);
>  		goto error;
> 
> 
> 
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