Merge tag 'cifs-bug-fixes-for-4.13' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
 "First set of CIFS/SMB3 fixes for the merge window. Also improves POSIX
  character mapping for SMB3"

* tag 'cifs-bug-fixes-for-4.13' of git://git.samba.org/sfrench/cifs-2.6:
  CIFS: fix circular locking dependency
  cifs: set oparms.create_options rather than or'ing in CREATE_OPEN_BACKUP_INTENT
  cifs: Do not modify mid entry after submitting I/O in cifs_call_async
  CIFS: add SFM mapping for 0x01-0x1F
  cifs: hide unused functions
  cifs: Use smb 2 - 3 and cifsacl mount options getacl functions
  cifs: prototype declaration and definition for smb 2 - 3 and cifsacl mount options
  CIFS: add CONFIG_CIFS_DEBUG_KEYS to dump encryption keys
  cifs: set mapping error when page writeback fails in writepage or launder_pages
  SMB3: Enable encryption for SMB3.1.1

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 47a125ece11e..7efbab013957 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -536,11 +536,14 @@ cifs_call_async(struct TCP_Server_Info *server, struct smb_rqst *rqst,
 	list_add_tail(&mid->qhead, &server->pending_mid_q);
 	spin_unlock(&GlobalMid_Lock);
 
-
+	/*
+	 * Need to store the time in mid before calling I/O. For call_async,
+	 * I/O response may come back and free the mid entry on another thread.
+	 */
+	cifs_save_when_sent(mid);
 	cifs_in_send_inc(server);
 	rc = smb_send_rqst(server, rqst, flags);
 	cifs_in_send_dec(server);
-	cifs_save_when_sent(mid);
 
 	if (rc < 0) {
 		server->sequence_number -= 2;