From 61cabc7b0a5cf0d3c532cfa96594c801743fe7f6 Mon Sep 17 00:00:00 2001 From: Ronnie Sahlberg Date: Fri, 14 Jun 2019 13:02:29 +1000 Subject: cifs: fix GlobalMid_Lock bug in cifs_reconnect 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 Acked-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/connect.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/cifs/connect.c') diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 8c4121da624e..8dd6637a3cbb 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -476,6 +476,7 @@ cifs_reconnect(struct TCP_Server_Info *server) 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); @@ -493,6 +494,7 @@ cifs_reconnect(struct TCP_Server_Info *server) } 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 -- cgit v1.2.3-59-g8ed1b