IB/cq: Don't process more than the given budget

The caller might not want this overhead.

Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/cq.c b/drivers/infiniband/core/cq.c
index 2746d2eb3d52c4036518b26e2b22038de80bd788..f2ae75fa3128b9101985bb92e882b596404c7ebc 100644 (file)
--- a/drivers/infiniband/core/cq.c
+++ b/drivers/infiniband/core/cq.c
@@ -29,7 +29,13 @@ static int __ib_process_cq(struct ib_cq *cq, int budget)
 {
        int i, n, completed = 0;
 
-       while ((n = ib_poll_cq(cq, IB_POLL_BATCH, cq->wc)) > 0) {
+       /*
+        * budget might be (-1) if the caller does not
+        * want to bound this call, thus we need unsigned
+        * minimum here.
+        */
+       while ((n = ib_poll_cq(cq, min_t(u32, IB_POLL_BATCH,
+                       budget - completed), cq->wc)) > 0) {
                for (i = 0; i < n; i++) {
                        struct ib_wc *wc = &cq->wc[i];