linux-kernel - [PATCH] nbd: Fix passing zero to 'PTR

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Message-ID: <20201112145348.51284-1-yuehaibing@huawei.com>
Date:   Thu, 12 Nov 2020 22:53:48 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <josef@...icpanda.com>, <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <nbd@...er.debian.org>,
        <linux-kernel@...r.kernel.org>, YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH] nbd: Fix passing zero to 'PTR_ERR' warning

Fix smatch warning:

drivers/block/nbd.c:698 nbd_read_stat() warn: passing zero to 'ERR_PTR'

sock_xmit() never return 0, remove check 0 to fix this warning.

Signed-off-by: YueHaibing <yuehaibing@...wei.com>
---
 drivers/block/nbd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index aaae9220f3a0..1620d1217581 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -691,7 +691,7 @@ static struct nbd_cmd *nbd_read_stat(struct nbd_device *nbd, int index)
 	reply.magic = 0;
 	iov_iter_kvec(&to, READ, &iov, 1, sizeof(reply));
 	result = sock_xmit(nbd, index, 0, &to, MSG_WAITALL, NULL);
-	if (result <= 0) {
+	if (result < 0) {
 		if (!nbd_disconnected(config))
 			dev_err(disk_to_dev(nbd->disk),
 				"Receive control failed (result %d)\n", result);
-- 
2.17.1