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Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_cq.c')
-rw-r--r--drivers/infiniband/hw/ipath/ipath_cq.c48
1 files changed, 34 insertions, 14 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_cq.c b/drivers/infiniband/hw/ipath/ipath_cq.c
index 049221bc590e..87462e0cb4d2 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);
@@ -177,11 +184,6 @@ struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries,
goto done;
}
- if (dev->n_cqs_allocated == ib_ipath_max_cqs) {
- ret = ERR_PTR(-ENOMEM);
- goto done;
- }
-
/* Allocate the completion queue structure. */
cq = kmalloc(sizeof(*cq), GFP_KERNEL);
if (!cq) {
@@ -237,6 +239,16 @@ struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries,
} else
cq->ip = NULL;
+ spin_lock(&dev->n_cqs_lock);
+ if (dev->n_cqs_allocated == ib_ipath_max_cqs) {
+ spin_unlock(&dev->n_cqs_lock);
+ ret = ERR_PTR(-ENOMEM);
+ goto bail_wc;
+ }
+
+ dev->n_cqs_allocated++;
+ spin_unlock(&dev->n_cqs_lock);
+
/*
* ib_create_cq() will initialize cq->ibcq except for cq->ibcq.cqe.
* The number of entries should be >= the number requested or return
@@ -253,7 +265,6 @@ struct ib_cq *ipath_create_cq(struct ib_device *ibdev, int entries,
ret = &cq->ibcq;
- dev->n_cqs_allocated++;
goto done;
bail_wc:
@@ -280,7 +291,9 @@ int ipath_destroy_cq(struct ib_cq *ibcq)
struct ipath_cq *cq = to_icq(ibcq);
tasklet_kill(&cq->comptask);
+ spin_lock(&dev->n_cqs_lock);
dev->n_cqs_allocated--;
+ spin_unlock(&dev->n_cqs_lock);
if (cq->ip)
kref_put(&cq->ip->ref, ipath_release_mmap_info);
else
@@ -316,10 +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;
@@ -355,6 +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;
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