cifs: on send failure, readjust server sequence number downward

If sending a call to the server fails for some reason (for instance, the
sending thread caught a signal), then we must readjust the sequence
number downward again or the next send will have it too high.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 653bf266428e..293d2c83dfbe 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -522,6 +522,9 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
         rc = smb_send_rqst(server, rqst);
         cifs_in_send_dec(server);
         cifs_save_when_sent(mid);
+
+        if (rc < 0)
+                server->sequence_number -= 2;
         mutex_unlock(&server->srv_mutex);
 
         if (rc == 0)
@@ -711,6 +714,8 @@ SendReceive2(const unsigned int xid, struct cifs_ses *ses,
         cifs_in_send_dec(ses->server);
         cifs_save_when_sent(midQ);
 
+        if (rc < 0)
+                ses->server->sequence_number -= 2;
         mutex_unlock(&ses->server->srv_mutex);
 
         if (rc < 0) {
@@ -835,6 +840,10 @@ SendReceive(const unsigned int xid, struct cifs_ses *ses,
         rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
         cifs_in_send_dec(ses->server);
         cifs_save_when_sent(midQ);
+
+        if (rc < 0)
+                ses->server->sequence_number -= 2;
+
         mutex_unlock(&ses->server->srv_mutex);
 
         if (rc < 0)
@@ -968,6 +977,10 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifs_tcon *tcon,
         rc = smb_send(ses->server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
         cifs_in_send_dec(ses->server);
         cifs_save_when_sent(midQ);
+
+        if (rc < 0)
+                ses->server->sequence_number -= 2;
+
         mutex_unlock(&ses->server->srv_mutex);
 
         if (rc < 0) {