linux-kernel - [PATCH 4/5] drm/rcar-du: fix error return code

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Date:	Sun, 23 Nov 2014 14:11:17 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] drm/rcar-du: fix error return code

From: Julia Lawall <Julia.Lawall@...6.fr>

Propagate the error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 088bfd8..23cc910 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -586,7 +586,7 @@ int rcar_du_crtc_create(struct rcar_du_group *rgrp, unsigned int index)
 
 	if (irq < 0) {
 		dev_err(rcdu->dev, "no IRQ for CRTC %u\n", index);
-		return ret;
+		return irq;
 	}
 
 	ret = devm_request_irq(rcdu->dev, irq, rcar_du_crtc_irq, irqflags,

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