We can not hold the GlobalMid_Lock spinlock during the
dfs processing in cifs_reconnect since it invokes things that may sleep
and thus trigger :
BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:23
Thus we need to drop the spinlock during this code block.
RHBZ:
1716743
Cc: stable@vger.kernel.org
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
spin_lock(&GlobalMid_Lock);
server->nr_targets = 1;
#ifdef CONFIG_CIFS_DFS_UPCALL
+ spin_unlock(&GlobalMid_Lock);
cifs_sb = find_super_by_tcp(server);
if (IS_ERR(cifs_sb)) {
rc = PTR_ERR(cifs_sb);
}
cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__,
server->nr_targets);
+ spin_lock(&GlobalMid_Lock);
#endif
if (server->tcpStatus == CifsExiting) {
/* the demux thread will exit normally