1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
index 234fdcfbdf01..6c98cf042714 100644
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -1912,6 +1912,15 @@ static struct request *get_request(request_queue_t *q, int rw, struct bio *bio,
         }
 
 get_rq:
+        /*
+         * Only allow batching queuers to allocate up to 50% over the defined
+         * limit of requests, otherwise we could have thousands of requests
+         * allocated with any setting of ->nr_requests
+         */
+        if (rl->count[rw] >= (3 * q->nr_requests / 2)) {
+                spin_unlock_irq(q->queue_lock);
+                goto out;
+        }
         rl->count[rw]++;
         rl->starved[rw] = 0;
         if (rl->count[rw] >= queue_congestion_on_threshold(q))