CIFS: fix deadlock in cached root handling
Prevent deadlock between open_shroot() and cifs_mark_open_files_invalid() by releasing the lock before entering SMB2_open, taking it again after and checking if we still need to use the result. Link: https://lore.kernel.org/linux-cifs/684ed01c-cbca-2716-bc28-b0a59a0f8521@prodrive-technologies.com/T/#u Fixes: 3d4ef9a1 ("smb3: fix redundant opens on root") Signed-off-by: NAurelien Aptel <aaptel@suse.com> Reviewed-by: NPavel Shilovsky <pshilov@microsoft.com> Signed-off-by: NSteve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
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