From fedd9e1f75828992ace5833379116f38c66ad7bb Mon Sep 17 00:00:00 2001 From: Sagi Grimberg <sagi@grimberg.me> Date: Thu, 16 Mar 2017 18:57:00 +0200 Subject: [PATCH] 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> --- drivers/infiniband/core/cq.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/core/cq.c b/drivers/infiniband/core/cq.c index 2746d2eb3d52c..f2ae75fa3128b 100644 --- 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]; -- GitLab