[PATCH] cifs: Fix oops due to uncleared server->smbd_conn in reconnect

[David Howells <dhowells@redhat.com>]

Hi Steve,

That attached patch stops the kernel from oopsing, but it still tries
endlessly to send with softRoCE.  I'm having better luck with softIWarp - with
some other patches, I can run generic/001 to completion with that transport.

David

---
commit 820cb3802c6a73c54e2e215b674eb5870fd5d0e5
Author: David Howells <dhowells@redhat.com>
Date:   Wed Jan 25 12:42:07 2023 +0000

    cifs: Fix oops due to uncleared server->smbd_conn in reconnect
    
    In smbd_destroy(), clear the server->smbd_conn pointer after freeing the
    smbd_connection struct that it points to so that reconnection doesn't get
    confused.
    
    Fixes: 8ef130f9ec27 ("CIFS: SMBD: Implement function to destroy a SMB Direct connection")
    Signed-off-by: David Howells <dhowells@redhat.com>
    cc: Long Li <longli@microsoft.com>
    cc: Steve French <smfrench@gmail.com>
    cc: Pavel Shilovsky <pshilov@microsoft.com>
    cc: Ronnie Sahlberg <lsahlber@redhat.com>
    cc: linux-cifs@vger.kernel.org

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 90789aaa6567..8c816b25ce7c 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -1405,6 +1405,7 @@ void smbd_destroy(struct TCP_Server_Info *server)
 	destroy_workqueue(info->workqueue);
 	log_rdma_event(INFO,  "rdma session destroyed\n");
 	kfree(info);
+	server->smbd_conn = NULL;
 }
 
 /*