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[PATCH RESEND 1/3] drm/i915: use error path

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  [PATCH RESEND 1/3] drm/i915: use error path Sudip Mukherjee <sudipm.mukherjee@gmail.com> - 2015-10-08 16:00 +0200
    Re: [PATCH RESEND 1/3] drm/i915: use error path Daniel Vetter <daniel@ffwll.ch> - 2015-10-08 16:30 +0200

#1242387 — [PATCH RESEND 1/3] drm/i915: use error path

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@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---

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

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#1242418

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@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Signed-off-by: Sudip Mukherjee <sudip@vectorindia.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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