From: Long Li <longli@microsoft.com>
Date: Tue, 14 May 2019 04:01:28 +0000 (-0700)
Subject: cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been... 
X-Git-Tag: v5.2-rc1~6^2~5
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1d2a4f57cebdab1d496b976a1e6ea998dc9b03c8;p=thirdparty%2Fkernel%2Flinux.git

cifs:smbd When reconnecting to server, call smbd_destroy() after all MIDs have been called

commit 214bab448476 ("cifs: Call MID callback before destroying transport")
assumes that the MID callback should not take srv_mutex, this may not always
be true. SMB Direct requires the MID callback completed before calling
transport so all pending memory registration can be freed. So restore the
original calling sequence so TCP transport will use the same code, but moving
smbd_destroy() after all MID has been called.

fixes: 214bab448476 ("cifs: Call MID callback before destroying transport")
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
---

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 084756cfdaee1..0b3ac8b76d188 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -528,6 +528,21 @@ cifs_reconnect(struct TCP_Server_Info *server)
 	/* do not want to be sending data on a socket we are freeing */
 	cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
 	mutex_lock(&server->srv_mutex);
+	if (server->ssocket) {
+		cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
+			 server->ssocket->state, server->ssocket->flags);
+		kernel_sock_shutdown(server->ssocket, SHUT_WR);
+		cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
+			 server->ssocket->state, server->ssocket->flags);
+		sock_release(server->ssocket);
+		server->ssocket = NULL;
+	}
+	server->sequence_number = 0;
+	server->session_estab = false;
+	kfree(server->session_key.response);
+	server->session_key.response = NULL;
+	server->session_key.len = 0;
+	server->lstrp = jiffies;
 
 	/* mark submitted MIDs for retry and issue callback */
 	INIT_LIST_HEAD(&retry_list);
@@ -540,6 +555,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
 		list_move(&mid_entry->qhead, &retry_list);
 	}
 	spin_unlock(&GlobalMid_Lock);
+	mutex_unlock(&server->srv_mutex);
 
 	cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
 	list_for_each_safe(tmp, tmp2, &retry_list) {
@@ -548,24 +564,11 @@ cifs_reconnect(struct TCP_Server_Info *server)
 		mid_entry->callback(mid_entry);
 	}
 
-	if (server->ssocket) {
-		cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
-			 server->ssocket->state, server->ssocket->flags);
-		kernel_sock_shutdown(server->ssocket, SHUT_WR);
-		cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
-			 server->ssocket->state, server->ssocket->flags);
-		sock_release(server->ssocket);
-		server->ssocket = NULL;
-	} else if (cifs_rdma_enabled(server))
+	if (cifs_rdma_enabled(server)) {
+		mutex_lock(&server->srv_mutex);
 		smbd_destroy(server);
-	server->sequence_number = 0;
-	server->session_estab = false;
-	kfree(server->session_key.response);
-	server->session_key.response = NULL;
-	server->session_key.len = 0;
-	server->lstrp = jiffies;
-
-	mutex_unlock(&server->srv_mutex);
+		mutex_unlock(&server->srv_mutex);
+	}
 
 	do {
 		try_to_freeze();