linux-kernel - [PATCH] storvsc: fix kzalloc-simple.cocci warnings

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Message-ID: <20161123025624.GA123019@ivytown2.lkp.intel.com>
Date:   Wed, 23 Nov 2016 10:56:24 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Cathy Avery <cavery@...hat.com>
Cc:     kbuild-all@...org, kys@...rosoft.com, haiyangz@...rosoft.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: [PATCH] storvsc: fix kzalloc-simple.cocci warnings

drivers/scsi/storvsc_drv.c:1500:13-20: WARNING: kzalloc should be used for payload, instead of kmalloc/memset


 Use kzalloc rather than kmalloc followed by memset with 0

 This considers some simple cases that are common and easy to validate
 Note in particular that there are no ...s in the rule, so all of the
 matched code has to be contiguous

Generated by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci

CC: Cathy Avery <cavery@...hat.com>
Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
---

 storvsc_drv.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1497,10 +1497,9 @@ static int storvsc_queuecommand(struct S
 
 			payload_sz = (sg_count * sizeof(u64) +
 				      sizeof(struct vmbus_packet_mpb_array));
-			payload = kmalloc(payload_sz, GFP_ATOMIC);
+			payload = kzalloc(payload_sz, GFP_ATOMIC);
 			if (!payload)
 				return SCSI_MLQUEUE_DEVICE_BUSY;
-			memset(payload, 0, payload_sz);
 		}
 
 		payload->range.len = length;