r8169: avoid needless NAPI poll scheduling

Theory  : though needless, it should not have hurt.
Practice: it does not play nice with DEBUG_SHIRQ + LOCKDEP + UP
(see https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=242572).

The patch makes sense in itself but I should dig why it has an effect
on #242572 (assuming that NAPI do not change in a near future).

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: Edward Hsu <edward_hsu@realtek.com.tw>

diff --git a/drivers/net/r8169.c b/drivers/net/r8169.c
index ec4f545..631e55d 100644 (file)
--- a/drivers/net/r8169.c
+++ b/drivers/net/r8169.c
@@ -2767,14 +2767,16 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
                        rtl8169_check_link_status(dev, tp, ioaddr);
 
 #ifdef CONFIG_R8169_NAPI
-               RTL_W16(IntrMask, tp->intr_event & ~tp->napi_event);
-               tp->intr_mask = ~tp->napi_event;
-
-               if (likely(netif_rx_schedule_prep(dev)))
-                       __netif_rx_schedule(dev);
-               else if (netif_msg_intr(tp)) {
-                       printk(KERN_INFO "%s: interrupt %04x taken in poll\n",
-                              dev->name, status);
+               if (status & tp->napi_event) {
+                       RTL_W16(IntrMask, tp->intr_event & ~tp->napi_event);
+                       tp->intr_mask = ~tp->napi_event;
+
+                       if (likely(netif_rx_schedule_prep(dev)))
+                               __netif_rx_schedule(dev);
+                       else if (netif_msg_intr(tp)) {
+                               printk(KERN_INFO "%s: interrupt %04x in poll\n",
+                                      dev->name, status);
+                       }
                }
                break;
 #else