linux-kernel - [PATCH 9/13] md: make return of 0 explicit

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Message-Id: <1400473875-22228-10-git-send-email-Julia.Lawall@lip6.fr>
Date:	Mon, 19 May 2014 06:31:11 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Neil Brown <neilb@...e.de>
Cc:	kernel-janitors@...r.kernel.org, linux-raid@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 9/13] md: make return of 0 explicit

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

Delete unnecessary local variable whose value is always 0 and that hides
the fact that the result is always 0.

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

// <smpl>
@r exists@
local idexpression ret;
expression e;
position p;
@@

-ret = 0;
... when != ret = e
return 
- ret
+ 0
  ;
// </smpl>

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

---
Alternatively, was an error code intended in the MD_MAX_BADBLOCKS case?

 drivers/md/md.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index f477e4c..23b7fee 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8297,7 +8297,6 @@ static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
 	u64 *p;
 	int lo, hi;
 	sector_t target = s + sectors;
-	int rv = 0;
 
 	if (bb->shift > 0) {
 		/* When clearing we round the start up and the end down.
@@ -8339,10 +8338,8 @@ static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
 
 			if (a < s) {
 				/* we need to split this range */
-				if (bb->count >= MD_MAX_BADBLOCKS) {
-					rv = 0;
+				if (bb->count >= MD_MAX_BADBLOCKS)
 					goto out;
-				}
 				memmove(p+lo+1, p+lo, (bb->count - lo) * 8);
 				bb->count++;
 				p[lo] = BB_MAKE(a, s-a, ack);
@@ -8378,7 +8375,7 @@ static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors)
 	bb->changed = 1;
 out:
 	write_sequnlock_irq(&bb->lock);
-	return rv;
+	return 0;
 }
 
 int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors,

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