diff options
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_cq.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_cq.c b/drivers/infiniband/hw/ipath/ipath_cq.c index 00440d5c91e..87462e0cb4d 100644 --- a/drivers/infiniband/hw/ipath/ipath_cq.c +++ b/drivers/infiniband/hw/ipath/ipath_cq.c @@ -46,7 +46,7 @@ */ void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int solicited) { - struct ipath_cq_wc *wc = cq->queue; + struct ipath_cq_wc *wc; unsigned long flags; u32 head; u32 next; @@ -57,6 +57,7 @@ void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int solicited) * Note that the head pointer might be writable by user processes. * Take care to verify it is a sane value. */ + wc = cq->queue; head = wc->head; if (head >= (unsigned) cq->ibcq.cqe) { head = cq->ibcq.cqe; @@ -109,21 +110,27 @@ void ipath_cq_enter(struct ipath_cq *cq, struct ib_wc *entry, int solicited) int ipath_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry) { struct ipath_cq *cq = to_icq(ibcq); - struct ipath_cq_wc *wc = cq->queue; + struct ipath_cq_wc *wc; unsigned long flags; int npolled; + u32 tail; spin_lock_irqsave(&cq->lock, flags); + wc = cq->queue; + tail = wc->tail; + if (tail > (u32) cq->ibcq.cqe) + tail = (u32) cq->ibcq.cqe; for (npolled = 0; npolled < num_entries; ++npolled, ++entry) { - if (wc->tail == wc->head) + if (tail == wc->head) break; - *entry = wc->queue[wc->tail]; - if (wc->tail >= cq->ibcq.cqe) - wc->tail = 0; + *entry = wc->queue[tail]; + if (tail >= cq->ibcq.cqe) + tail = 0; else - wc->tail++; + tail++; } + wc->tail = tail; spin_unlock_irqrestore(&cq->lock, flags); @@ -322,10 +329,16 @@ int ipath_req_notify_cq(struct ib_cq *ibcq, enum ib_cq_notify notify) return 0; } +/** + * ipath_resize_cq - change the size of the CQ + * @ibcq: the completion queue + * + * Returns 0 for success. + */ int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata) { struct ipath_cq *cq = to_icq(ibcq); - struct ipath_cq_wc *old_wc = cq->queue; + struct ipath_cq_wc *old_wc; struct ipath_cq_wc *wc; u32 head, tail, n; int ret; @@ -361,6 +374,7 @@ int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata) * Make sure head and tail are sane since they * might be user writable. */ + old_wc = cq->queue; head = old_wc->head; if (head > (u32) cq->ibcq.cqe) head = (u32) cq->ibcq.cqe; |