enic: Don't receive packets when the napi budget == 0

Processing any incoming packets with a with a napi budget of 0
is incorrect driver behavior.

This matters as netpoll will shortly call drivers with a budget of 0
to avoid receive packet processing happening in hard irq context.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
index dcd58f23834a..4c35fc8fad99 100644
--- a/drivers/net/ethernet/cisco/enic/enic_main.c
+++ b/drivers/net/ethernet/cisco/enic/enic_main.c
@@ -1086,14 +1086,15 @@ static int enic_poll(struct napi_struct *napi, int budget)
         unsigned int intr = enic_legacy_io_intr();
         unsigned int rq_work_to_do = budget;
         unsigned int wq_work_to_do = -1; /* no limit */
-        unsigned int  work_done, rq_work_done, wq_work_done;
+        unsigned int  work_done, rq_work_done = 0, wq_work_done;
         int err;
 
         /* Service RQ (first) and WQ
          */
 
-        rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
-                rq_work_to_do, enic_rq_service, NULL);
+        if (budget > 0)
+                rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
+                        rq_work_to_do, enic_rq_service, NULL);
 
         wq_work_done = vnic_cq_service(&enic->cq[cq_wq],
                 wq_work_to_do, enic_wq_service, NULL);
@@ -1141,14 +1142,15 @@ static int enic_poll_msix(struct napi_struct *napi, int budget)
         unsigned int cq = enic_cq_rq(enic, rq);
         unsigned int intr = enic_msix_rq_intr(enic, rq);
         unsigned int work_to_do = budget;
-        unsigned int work_done;
+        unsigned int work_done = 0;
         int err;
 
         /* Service RQ
          */
 
-        work_done = vnic_cq_service(&enic->cq[cq],
-                work_to_do, enic_rq_service, NULL);
+        if (budget > 0)
+                work_done = vnic_cq_service(&enic->cq[cq],
+                        work_to_do, enic_rq_service, NULL);
 
         /* Return intr event credits for this polling
          * cycle.  An intr event is the completion of a