Re: [PATCH v2] [media] Use common error handling code in 20 functions

[Todor Tomov]

Hi Markus,

Thank you for the patch.

On 19.02.2018 20:11, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> Date: Mon, 19 Feb 2018 18:50:40 +0100
> 
> Adjust jump targets so that a bit of exception handling can be better
> reused at the end of these functions.
> 
> This issue was partly detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
> ---
> 
> v2:
> Hans Verkuil insisted on patch squashing. Thus several changes
> were recombined based on source files from Linux next-20180216.
> 
> The implementation of the function "tda8261_set_params" was improved
> after a notification by Christoph BÃhmwalder on 2017-09-26.
> 
>  drivers/media/dvb-core/dmxdev.c                    | 16 ++++----
>  drivers/media/dvb-frontends/tda1004x.c             | 20 ++++++----
>  drivers/media/dvb-frontends/tda8261.c              | 19 ++++++----
>  drivers/media/pci/bt8xx/dst.c                      | 19 ++++++----
>  drivers/media/pci/bt8xx/dst_ca.c                   | 30 +++++++--------
>  drivers/media/pci/cx88/cx88-input.c                | 17 +++++----
>  drivers/media/platform/omap3isp/ispvideo.c         | 29 +++++++--------
>  .../media/platform/qcom/camss-8x16/camss-csid.c    | 20 +++++-----
>  drivers/media/tuners/tuner-xc2028.c                | 30 +++++++--------
>  drivers/media/usb/cpia2/cpia2_usb.c                | 13 ++++---
>  drivers/media/usb/gspca/gspca.c                    | 17 +++++----
>  drivers/media/usb/gspca/sn9c20x.c                  | 17 +++++----
>  drivers/media/usb/pvrusb2/pvrusb2-ioread.c         | 10 +++--
>  drivers/media/usb/tm6000/tm6000-cards.c            |  7 ++--
>  drivers/media/usb/tm6000/tm6000-dvb.c              | 11 ++++--
>  drivers/media/usb/tm6000/tm6000-video.c            | 13 ++++---
>  drivers/media/usb/ttusb-budget/dvb-ttusb-budget.c  | 13 +++----
>  drivers/media/usb/ttusb-dec/ttusb_dec.c            | 43 ++++++++--------------
>  drivers/media/usb/uvc/uvc_v4l2.c                   | 13 ++++---
>  19 files changed, 180 insertions(+), 177 deletions(-)
> 
> diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
> index 6d53af00190e..6a0411c91195 100644

<snip>

> diff --git a/drivers/media/platform/qcom/camss-8x16/camss-csid.c b/drivers/media/platform/qcom/camss-8x16/camss-csid.c
> index 64df82817de3..92d4dc6b4a66 100644
> --- a/drivers/media/platform/qcom/camss-8x16/camss-csid.c
> +++ b/drivers/media/platform/qcom/camss-8x16/camss-csid.c
> @@ -328,16 +328,12 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>  			return ret;
>  
>  		ret = csid_set_clock_rates(csid);
> -		if (ret < 0) {
> -			regulator_disable(csid->vdda);
> -			return ret;
> -		}
> +		if (ret < 0)
> +			goto disable_regulator;
>  
>  		ret = camss_enable_clocks(csid->nclocks, csid->clock, dev);
> -		if (ret < 0) {
> -			regulator_disable(csid->vdda);
> -			return ret;
> -		}
> +		if (ret < 0)
> +			goto disable_regulator;
>  
>  		enable_irq(csid->irq);
>  
> @@ -345,8 +341,7 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>  		if (ret < 0) {
>  			disable_irq(csid->irq);
>  			camss_disable_clocks(csid->nclocks, csid->clock);
> -			regulator_disable(csid->vdda);
> -			return ret;
> +			goto disable_regulator;
>  		}
>  
>  		hw_version = readl_relaxed(csid->base + CAMSS_CSID_HW_VERSION);
> @@ -357,6 +352,11 @@ static int csid_set_power(struct v4l2_subdev *sd, int on)
>  		ret = regulator_disable(csid->vdda);
>  	}
>  
> +	goto exit;

I think it will be cleaner if you remove the exit label and return here instead.

> +
> +disable_regulator:
> +	regulator_disable(csid->vdda);
> +exit:
>  	return ret;
>  }

-- 
Best regards,
Todor Tomov