libertas: fix interrupt issue

This helps against lost interrupts and aids in debugging this.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/net/wireless/libertas/if_cs.c b/drivers/net/wireless/libertas/if_cs.c
index 873ab10a078..b5d0cd4c411 100644
--- a/drivers/net/wireless/libertas/if_cs.c
+++ b/drivers/net/wireless/libertas/if_cs.c
@@ -379,6 +379,8 @@ static irqreturn_t if_cs_interrupt(int irq, void *data)
 
         /* Ask card interrupt cause register if there is something for us */
         cause = if_cs_read16(card, IF_CS_CARD_INT_CAUSE);
+        lbs_deb_cs("cause 0x%04x\n", cause);
+
         if (cause == 0) {
                 /* Not for us */
                 return IRQ_NONE;
@@ -390,10 +392,6 @@ static irqreturn_t if_cs_interrupt(int irq, void *data)
                 return IRQ_HANDLED;
         }
 
-        /* Clear interrupt cause */
-        if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK);
-        lbs_deb_cs("cause 0x%04x\n", cause);
-
         if (cause & IF_CS_BIT_RX) {
                 struct sk_buff *skb;
                 lbs_deb_cs("rx packet\n");
@@ -434,6 +432,9 @@ static irqreturn_t if_cs_interrupt(int irq, void *data)
                 lbs_queue_event(priv, event >> 8 & 0xff);
         }
 
+        /* Clear interrupt cause */
+        if_cs_write16(card, IF_CS_CARD_INT_CAUSE, cause & IF_CS_BIT_MASK);
+
         lbs_deb_leave(LBS_DEB_CS);
         return IRQ_HANDLED;
 }