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authorShyam Prasad N <sprasad@microsoft.com>2021-07-19 17:05:53 +0000
committerSteve French <stfrench@microsoft.com>2022-01-07 20:07:07 -0600
commit080dc5e5656c1cc1cdefb501b9b645a07519f763 (patch)
tree417e32ff394a376212b5e5d2491564c9eb27c574 /fs/cifs/smb2ops.c
parent183eea2ee5ba968ca7c31f04a0f01fd3e5c1d014 (diff)
downloadlinux-080dc5e5656c1cc1cdefb501b9b645a07519f763.tar.bz2
cifs: take cifs_tcp_ses_lock for status checks
While checking/updating status for tcp ses, smb ses or tcon, we take GlobalMid_Lock. This doesn't make any sense. Replaced it with cifs_tcp_ses_lock. Ideally, we should take a spin lock per struct. But since tcp ses, smb ses and tcon objects won't add up to a lot, I think there should not be too much contention. Also, in few other places, these are checked without locking. Added locking for these. Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2ops.c')
-rw-r--r--fs/cifs/smb2ops.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index b33b0f391a23..c2368c9110b0 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -121,9 +121,13 @@ smb2_add_credits(struct TCP_Server_Info *server,
optype, scredits, add);
}
+ spin_lock(&cifs_tcp_ses_lock);
if (server->tcpStatus == CifsNeedReconnect
- || server->tcpStatus == CifsExiting)
+ || server->tcpStatus == CifsExiting) {
+ spin_unlock(&cifs_tcp_ses_lock);
return;
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
switch (rc) {
case -1:
@@ -208,11 +212,15 @@ smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
return rc;
spin_lock(&server->req_lock);
} else {
+ spin_unlock(&server->req_lock);
+ spin_lock(&cifs_tcp_ses_lock);
if (server->tcpStatus == CifsExiting) {
- spin_unlock(&server->req_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return -ENOENT;
}
+ spin_unlock(&cifs_tcp_ses_lock);
+ spin_lock(&server->req_lock);
scredits = server->credits;
/* can deadlock with reopen */
if (scredits <= 8) {
@@ -4983,10 +4991,12 @@ static void smb2_decrypt_offload(struct work_struct *work)
mid->callback(mid);
} else {
+ spin_lock(&cifs_tcp_ses_lock);
spin_lock(&GlobalMid_Lock);
if (dw->server->tcpStatus == CifsNeedReconnect) {
mid->mid_state = MID_RETRY_NEEDED;
spin_unlock(&GlobalMid_Lock);
+ spin_unlock(&cifs_tcp_ses_lock);
mid->callback(mid);
} else {
mid->mid_state = MID_REQUEST_SUBMITTED;
@@ -4994,6 +5004,7 @@ static void smb2_decrypt_offload(struct work_struct *work)
list_add_tail(&mid->qhead,
&dw->server->pending_mid_q);
spin_unlock(&GlobalMid_Lock);
+ spin_unlock(&cifs_tcp_ses_lock);
}
}
cifs_mid_q_entry_release(mid);