diff options
Diffstat (limited to 'net/9p/client.c')
| -rw-r--r-- | net/9p/client.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/net/9p/client.c b/net/9p/client.c index 9186550d77a6..0004cbaac4a4 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -415,9 +415,17 @@ static void p9_free_req(struct p9_client *c, struct p9_req_t *r) * req: request received * */ -void p9_client_cb(struct p9_client *c, struct p9_req_t *req) +void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) { p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); + + /* + * This barrier is needed to make sure any change made to req before + * the other thread wakes up will indeed be seen by the waiting side. + */ + smp_wmb(); + req->status = status; + wake_up(req->wq); p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); } @@ -655,16 +663,13 @@ static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) if (IS_ERR(req)) return PTR_ERR(req); - /* * if we haven't received a response for oldreq, * remove it from the list */ - if (oldreq->status == REQ_STATUS_FLSH) { - spin_lock(&c->lock); - list_del(&oldreq->req_list); - spin_unlock(&c->lock); - } + if (oldreq->status == REQ_STATUS_SENT) + if (c->trans_mod->cancelled) + c->trans_mod->cancelled(c, oldreq); p9_free_req(c, req); return 0; @@ -751,6 +756,12 @@ again: err = wait_event_interruptible(*req->wq, req->status >= REQ_STATUS_RCVD); + /* + * Make sure our req is coherent with regard to updates in other + * threads - echoes to wmb() in the callback + */ + smp_rmb(); + if ((err == -ERESTARTSYS) && (c->status == Connected) && (type == P9_TFLUSH)) { sigpending = 1; |