linux-kernel - Re: [PATCH RESEND 1/3] drm/i915: use error path

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Date:	Thu, 8 Oct 2015 16:30:22 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	intel-gfx@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...el.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>
Subject: Re: [PATCH RESEND 1/3] drm/i915: use error path

On Thu, Oct 08, 2015 at 07:27:59PM +0530, Sudip Mukherjee wrote:
> Use goto to handle the error path to avoid duplicating the same code. In
> the error path intel_dig_port is the last one to be released as it was
> the first one to be allocated and ideally the error path should be the
> reverse of the execution path.
> 
> Cc: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Jani Nikula <jani.nikula@...ux.intel.com>
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>

Queued for -next, thanks for the patch.
-Daniel

> ---
> 
> Sent on 27/07/2015
> 
>  drivers/gpu/drm/i915/intel_dp.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 8d34ca7..18bcfbe 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -6168,10 +6168,8 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
>  		return;
>  
>  	intel_connector = intel_connector_alloc();
> -	if (!intel_connector) {
> -		kfree(intel_dig_port);
> -		return;
> -	}
> +	if (!intel_connector)
> +		goto err_connector_alloc;
>  
>  	intel_encoder = &intel_dig_port->base;
>  	encoder = &intel_encoder->base;
> @@ -6219,11 +6217,18 @@ intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
>  	intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
>  	dev_priv->hotplug.irq_port[port] = intel_dig_port;
>  
> -	if (!intel_dp_init_connector(intel_dig_port, intel_connector)) {
> -		drm_encoder_cleanup(encoder);
> -		kfree(intel_dig_port);
> -		kfree(intel_connector);
> -	}
> +	if (!intel_dp_init_connector(intel_dig_port, intel_connector))
> +		goto err_init_connector;
> +
> +	return;
> +
> +err_init_connector:
> +	drm_encoder_cleanup(encoder);
> +	kfree(intel_connector);
> +err_connector_alloc:
> +	kfree(intel_dig_port);
> +
> +	return;
>  }
>  
>  void intel_dp_mst_suspend(struct drm_device *dev)
> -- 
> 1.9.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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