In order to scale down the channels, the following sequence
of operations happen:
1. server struct is marked for terminate
2. the channel is deallocated in the ses->chans array
3. at a later point the cifsd thread actually terminates the server
Between 2 and 3, there can be calls to find the channel for
a server struct. When that happens, there can be an ugly warning
that's logged. But this is expected.
So this change does two things:
1. in cifs_ses_get_chan_index, if server->terminate is set, return
2. always make sure server->terminate is set with chan_lock held
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
{
unsigned int i;
+ /* if the channel is waiting for termination */
+ if (server->terminate)
+ return CIFS_INVAL_CHAN_INDEX;
+
for (i = 0; i < ses->chan_count; i++) {
if (ses->chans[i].server == server)
return i;
}
ses->chans[chan_index].server = NULL;
+ server->terminate = true;
spin_unlock(&ses->chan_lock);
/*
*/
cifs_put_tcp_session(server, from_reconnect);
- server->terminate = true;
cifs_signal_cifsd_for_reconnect(server, false);
/* mark primary server as needing reconnect */