stable inclusion
from stable-v5.10.94
commit dfde7afed7116374074e531dfad9919348bef5ac
bugzilla: https://gitee.com/openeuler/kernel/issues/I531X9

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=dfde7afed7116374074e531dfad9919348bef5ac

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[ Upstream commit d7519392 ]

Make sure ->dax_dev is NULL on error so that the cleanup path doesn't
trip over an ERR_PTR.
Reported-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211129102203.2243509-2-hch@lst.deSigned-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>