linux-kernel - [PATCH 4.4 037/162] dlm: NULL check before kmem_cache

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Message-Id: <20191219183210.080196584@linuxfoundation.org>
Date:   Thu, 19 Dec 2019 19:32:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wen Yang <wen.yang99@....com.cn>,
        David Teigland <teigland@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 037/162] dlm: NULL check before kmem_cache_destroy is not needed

From: Wen Yang <wen.yang99@....com.cn>

[ Upstream commit f31a89692830061bceba8469607e4e4b0f900159 ]

kmem_cache_destroy(NULL) is safe, so removes NULL check before
freeing the mem. This patch also fix ifnullfree.cocci warnings.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Signed-off-by: David Teigland <teigland@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/dlm/memory.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/dlm/memory.c b/fs/dlm/memory.c
index 7cd24bccd4fe5..37be29f21d04d 100644
--- a/fs/dlm/memory.c
+++ b/fs/dlm/memory.c
@@ -38,10 +38,8 @@ int __init dlm_memory_init(void)
 
 void dlm_memory_exit(void)
 {
-	if (lkb_cache)
-		kmem_cache_destroy(lkb_cache);
-	if (rsb_cache)
-		kmem_cache_destroy(rsb_cache);
+	kmem_cache_destroy(lkb_cache);
+	kmem_cache_destroy(rsb_cache);
 }
 
 char *dlm_allocate_lvb(struct dlm_ls *ls)
@@ -86,8 +84,7 @@ void dlm_free_lkb(struct dlm_lkb *lkb)
 		struct dlm_user_args *ua;
 		ua = lkb->lkb_ua;
 		if (ua) {
-			if (ua->lksb.sb_lvbptr)
-				kfree(ua->lksb.sb_lvbptr);
+			kfree(ua->lksb.sb_lvbptr);
 			kfree(ua);
 		}
 	}
-- 
2.20.1