diff options
| author | Long Li <longli@microsoft.com> | 2017-06-28 15:55:55 -0700 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2017-07-05 19:58:08 -0500 |
| commit | 93d2cb6c82f4d50a1b35b9de379ebb1d022801ac (patch) | |
| tree | ed3fd67ed88beceda359993e3bce7f1d446358f6 /fs/cifs/transport.c | |
| parent | 7e46f0900acdd8cc26588d8f6abdf2ed75dfbcd8 (diff) | |
| download | lwn-93d2cb6c82f4d50a1b35b9de379ebb1d022801ac.tar.gz lwn-93d2cb6c82f4d50a1b35b9de379ebb1d022801ac.zip | |
cifs: Do not modify mid entry after submitting I/O in cifs_call_async
In cifs_call_async, server may respond as soon as I/O is submitted. Because
mid entry is freed on the return path, it should not be modified after I/O
is submitted.
cifs_save_when_sent modifies the sent timestamp in mid entry, and should not
be called after I/O. Call it before I/O.
Signed-off-by: Long Li <longli@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/transport.c')
| -rw-r--r-- | fs/cifs/transport.c | 7 |
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; |