CIFS: Make wait_for_free_request killable

to let us kill the proccess if it hangs waiting for a credit when
the session is down and echo is disabled.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index e5202ddef2fb..58b31da17fc5 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -257,6 +257,8 @@ smb_send(struct TCP_Server_Info *server, struct smb_hdr *smb_buffer,
 static int
 wait_for_free_request(struct TCP_Server_Info *server, const int long_op)
 {
+        int rc;
+
         spin_lock(&server->req_lock);
 
         if (long_op == CIFS_ASYNC_OP) {
@@ -271,8 +273,11 @@ wait_for_free_request(struct TCP_Server_Info *server, const int long_op)
                 if (server->credits <= 0) {
                         spin_unlock(&server->req_lock);
                         cifs_num_waiters_inc(server);
-                        wait_event(server->request_q, has_credits(server));
+                        rc = wait_event_killable(server->request_q,
+                                                 has_credits(server));
                         cifs_num_waiters_dec(server);
+                        if (rc)
+                                return rc;
                         spin_lock(&server->req_lock);
                 } else {
                         if (server->tcpStatus == CifsExiting) {