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Diffstat (limited to 'drivers/infiniband/hw/hfi1/user_sdma.c')
-rw-r--r--drivers/infiniband/hw/hfi1/user_sdma.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index c2f0d9ba93de..13e4203497b3 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c
@@ -141,6 +141,7 @@ static int defer_packet_queue(
*/
xchg(&pq->state, SDMA_PKT_Q_DEFERRED);
if (list_empty(&pq->busy.list)) {
+ pq->busy.lock = &sde->waitlock;
iowait_get_priority(&pq->busy);
iowait_queue(pkts_sent, &pq->busy, &sde->dmawait);
}
@@ -155,6 +156,7 @@ static void activate_packet_queue(struct iowait *wait, int reason)
{
struct hfi1_user_sdma_pkt_q *pq =
container_of(wait, struct hfi1_user_sdma_pkt_q, busy);
+ pq->busy.lock = NULL;
xchg(&pq->state, SDMA_PKT_Q_ACTIVE);
wake_up(&wait->wait_dma);
};
@@ -256,6 +258,21 @@ pq_reqs_nomem:
return ret;
}
+static void flush_pq_iowait(struct hfi1_user_sdma_pkt_q *pq)
+{
+ unsigned long flags;
+ seqlock_t *lock = pq->busy.lock;
+
+ if (!lock)
+ return;
+ write_seqlock_irqsave(lock, flags);
+ if (!list_empty(&pq->busy.list)) {
+ list_del_init(&pq->busy.list);
+ pq->busy.lock = NULL;
+ }
+ write_sequnlock_irqrestore(lock, flags);
+}
+
int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
struct hfi1_ctxtdata *uctxt)
{
@@ -281,6 +298,7 @@ int hfi1_user_sdma_free_queues(struct hfi1_filedata *fd,
kfree(pq->reqs);
kfree(pq->req_in_use);
kmem_cache_destroy(pq->txreq_cache);
+ flush_pq_iowait(pq);
kfree(pq);
} else {
spin_unlock(&fd->pq_rcu_lock);
@@ -587,11 +605,12 @@ int hfi1_user_sdma_process_request(struct hfi1_filedata *fd,
if (ret < 0) {
if (ret != -EBUSY)
goto free_req;
- wait_event_interruptible_timeout(
+ if (wait_event_interruptible_timeout(
pq->busy.wait_dma,
- (pq->state == SDMA_PKT_Q_ACTIVE),
+ pq->state == SDMA_PKT_Q_ACTIVE,
msecs_to_jiffies(
- SDMA_IOWAIT_TIMEOUT));
+ SDMA_IOWAIT_TIMEOUT)) <= 0)
+ flush_pq_iowait(pq);
}
}
*count += idx;