r6040: only disable RX interrupt if napi_schedule_prep is successful

When receiving the first RX interrupt before the internal call
to napi_schedule_prep is successful the RX interrupt gets disabled
and is never enabled again as the poll function never gets executed.

Signed-off-by: Michael Thalmeier <Michael.Thalmeier@sigmatek.at>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c
index 200a363c3bf5..0ffec4608441 100644
--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -677,9 +677,11 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
                 if (status & RX_FIFO_FULL)
                         dev->stats.rx_fifo_errors++;
 
-                /* Mask off RX interrupt */
-                misr &= ~RX_INTS;
-                napi_schedule(&lp->napi);
+                if (likely(napi_schedule_prep(&lp->napi))) {
+                        /* Mask off RX interrupt */
+                        misr &= ~RX_INTS;
+                        __napi_schedule(&lp->napi);
+                }
         }
 
         /* TX interrupt request */