wl1251: Fix regression in IRQ loop handling

In some cases, the IRQ loop handler could acknowledge an interrupt to
the chipset, but not service it.
Signed-off-by: NJuuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: NJanne Ylalehto <janne.ylalehto@nokia.com>
Signed-off-by: NLuciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: NKalle Valo <kalle.valo@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_main.c

@@ -308,9 +308,11 @@ static void wl1251_irq_work(struct work_struct *work)
 			wl1251_debug(DEBUG_IRQ,
 				     "WL1251_ACX_INTR_INIT_COMPLETE");
 
-		intr = wl1251_reg_read32(wl, ACX_REG_INTERRUPT_CLEAR);
+		if (--ctr == 0)
+			break;
 
-	} while (intr && --ctr);
+		intr = wl1251_reg_read32(wl, ACX_REG_INTERRUPT_CLEAR);
+	} while (intr);
 
 out_sleep:
 	wl1251_reg_write32(wl, ACX_REG_INTERRUPT_MASK, ~(wl->intr_mask));