CIFS: Avoid returning EBUSY to upper layer VFS
EBUSY is not handled by VFS, and will be passed to user-mode. This is not correct as we need to wait for more credits. This patch also fixes a bug where rsize or wsize is used uninitialized when the call to server->ops->wait_mtu_credits() fails. Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NLong Li <longli@microsoft.com> Signed-off-by: NSteve French <stfrench@microsoft.com> Reviewed-by: NPavel Shilovsky <pshilov@microsoft.com>
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