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xen/9pfs: fix return value check in xen_9pfs_front_probe()
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: 71ebd71921e4 ("xen/9pfs: connect to the backend") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
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@ -454,8 +454,8 @@ static int xen_9pfs_front_probe(struct xenbus_device *dev,
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goto error_xenbus;
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}
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priv->tag = xenbus_read(xbt, dev->nodename, "tag", NULL);
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if (!priv->tag) {
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ret = -EINVAL;
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if (IS_ERR(priv->tag)) {
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ret = PTR_ERR(priv->tag);
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goto error_xenbus;
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}
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ret = xenbus_transaction_end(xbt, 0);
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