linux-kernel - [PATCH 10/16] zram: fix error return code

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Message-Id: <1428235596-4757-11-git-send-email-Julia.Lawall@lip6.fr>
Date:	Sun,  5 Apr 2015 14:06:30 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Minchan Kim <minchan@...nel.org>
Cc:	kernel-janitors@...r.kernel.org, Nitin Gupta <ngupta@...are.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 10/16] zram: fix error return code

Return a negative 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/block/zram/zram_drv.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 759ee09..fe67ebb 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1188,6 +1188,7 @@ static int zram_add(int device_id)
 	if (!queue) {
 		pr_err("Error allocating disk queue for device %d\n",
 			device_id);
+		ret = -ENOMEM;
 		goto out_free_idr;
 	}
 
@@ -1198,6 +1199,7 @@ static int zram_add(int device_id)
 	if (!zram->disk) {
 		pr_warn("Error allocating disk structure for device %d\n",
 			device_id);
+		ret = -ENOMEM;
 		goto out_free_queue;
 	}
 

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