linux-kernel - [PATCH v3] fs, dlm: don't do pointless NULL check, use kzalloc and fix order of arguments

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Message-ID: <alpine.LNX.2.00.1107102252510.2818@swampdragon.chaosbits.net>
Date:	Sun, 10 Jul 2011 22:54:31 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	David Teigland <teigland@...hat.com>
cc:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com,
	Christine Caulfield <ccaulfie@...hat.com>,
	"Dr. David Alan Gilbert" <linux@...blig.org>
Subject: [PATCH v3] fs, dlm: don't do pointless NULL check, use kzalloc and
 fix order of arguments

In fs/dlm/lock.c in the dlm_scan_waiters() function there are 3 small
issues:

1) There's no need to test the return value of the allocation and do a
memset if is succeedes. Just use kzalloc() to obtain zeroed memory.

2) Since kfree() handles NULL pointers gracefully, the test of
'warned' against NULL before the kfree() after the loop is completely
pointless. Remove it.

3) The arguments to kmalloc() (now kzalloc()) were swapped. Thanks to
Dr. David Alan Gilbert for pointing this out.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 fs/dlm/lock.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index f71d0b5..84c52e6 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -849,9 +849,7 @@ void dlm_scan_waiters(struct dlm_ls *ls)
 
 		if (!num_nodes) {
 			num_nodes = ls->ls_num_nodes;
-			warned = kmalloc(GFP_KERNEL, num_nodes * sizeof(int));
-			if (warned)
-				memset(warned, 0, num_nodes * sizeof(int));
+			warned = kzalloc(num_nodes * sizeof(int), GFP_KERNEL);
 		}
 		if (!warned)
 			continue;
@@ -863,9 +861,7 @@ void dlm_scan_waiters(struct dlm_ls *ls)
 			  dlm_config.ci_waitwarn_us, lkb->lkb_wait_nodeid);
 	}
 	mutex_unlock(&ls->ls_waiters_mutex);
-
-	if (warned)
-		kfree(warned);
+	kfree(warned);
 
 	if (debug_expired)
 		log_debug(ls, "scan_waiters %u warn %u over %d us max %lld us",
-- 
1.7.6


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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