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xen/9pfs: fix return value check in xen_9pfs_front_probe()

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In case of error, the function xenbus_read() returns ERR_PTR() and never
returns NULL. The NULL test in the return value check should be replaced
with IS_ERR().

Fixes: 71ebd71921 ("xen/9pfs: connect to the backend")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Wei Yongjun 2017-05-16 14:22:47 +00:00 committed by Stefano Stabellini
parent 69861e0a52
commit 14e3995e63
1 changed files with 2 additions and 2 deletions
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4
net/9p/trans_xen.c
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@ -454,8 +454,8 @@ static int xen_9pfs_front_probe(struct xenbus_device *dev,
goto error_xenbus;
}
priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL);
if (!priv->tag) {
ret = -EINVAL;
if (IS_ERR(priv->tag)) {
ret = PTR_ERR(priv->tag);
goto error_xenbus;
}
ret = xenbus_transaction_end(xbt, 0);