linux-kernel - [PATCH 3.16 091/410] drivers: video: fbdev: atmel

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Date:   Thu, 07 Jun 2018 15:05:21 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Nicolas Ferre" <nicolas.ferre@...el.com>,
        "Tomi Valkeinen" <tomi.valkeinen@...com>,
        "Julia Lawall" <Julia.Lawall@...6.fr>
Subject: [PATCH 3.16 091/410] drivers: video: fbdev: atmel_lcdfb.c: fix
 error return code

3.16.57-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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

commit 6c131850eca653344c41d68ce87f3ab5a89af89e upstream.

Convert a zero return value on error 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: Julia Lawall <Julia.Lawall@...6.fr>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/video/fbdev/atmel_lcdfb.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/video/fbdev/atmel_lcdfb.c
+++ b/drivers/video/fbdev/atmel_lcdfb.c
@@ -1101,12 +1101,14 @@ static int atmel_lcdfb_of_init(struct at
 	timings = of_get_display_timings(display_np);
 	if (!timings) {
 		dev_err(dev, "failed to get display timings\n");
+		ret = -EINVAL;
 		goto put_display_node;
 	}
 
 	timings_np = of_find_node_by_name(display_np, "display-timings");
 	if (!timings_np) {
 		dev_err(dev, "failed to find display-timings node\n");
+		ret = -ENODEV;
 		goto put_display_node;
 	}