linux-kernel - [PATCH] lib: scatterlist: fix ifnullfree.cocci warnings

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Message-ID: <20160323023812.GA163037@athens>
Date:	Wed, 23 Mar 2016 10:38:12 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Ming Lin <mlin@...nel.org>
Cc:	kbuild-all@...org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: [PATCH] lib: scatterlist: fix ifnullfree.cocci warnings

lib/sg_pool.c:152:3-18: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.
lib/sg_pool.c:154:3-21: WARNING: NULL check before freeing functions like kfree, debugfs_remove, debugfs_remove_recursive or usb_free_urb is not needed. Maybe consider reorganizing relevant code to avoid passing NULL values.

 NULL check before some freeing functions is not needed.

 Based on checkpatch warning
 "kfree(NULL) is safe this check is probably not required"
 and kfreeaddr.cocci by Julia Lawall.

Generated by: scripts/coccinelle/free/ifnullfree.cocci

CC: Ming Lin <ming.l@....samsung.com>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 sg_pool.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/lib/sg_pool.c
+++ b/lib/sg_pool.c
@@ -148,10 +148,8 @@ static __init int sg_pool_init(void)
 cleanup_sdb:
 	for (i = 0; i < SG_MEMPOOL_NR; i++) {
 		struct sg_pool *sgp = sg_pools + i;
-		if (sgp->pool)
-			mempool_destroy(sgp->pool);
-		if (sgp->slab)
-			kmem_cache_destroy(sgp->slab);
+		mempool_destroy(sgp->pool);
+		kmem_cache_destroy(sgp->slab);
 	}

 	return -ENOMEM;