[PATCH] yenta: optimize interrupt handler

Don't waste cpu time in yenta interrupt handler when the interrupt was for
another device.

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index ec6ab65f0872..8bfe72b71302 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -531,6 +531,9 @@ static irqreturn_t yenta_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 
         csc = exca_readb(socket, I365_CSC);
 
+        if (!(cb_event || csc))
+                return IRQ_NONE;
+
         events = (cb_event & (CB_CD1EVENT | CB_CD2EVENT)) ? SS_DETECT : 0 ;
         events |= (csc & I365_CSC_DETECT) ? SS_DETECT : 0;
         if (exca_readb(socket, I365_INTCTL) & I365_PC_IOCARD) {
@@ -544,10 +547,7 @@ static irqreturn_t yenta_interrupt(int irq, void *dev_id, struct pt_regs *regs)
         if (events)
                 pcmcia_parse_events(&socket->socket, events);
 
-        if (cb_event || csc)
-                return IRQ_HANDLED;
-
-        return IRQ_NONE;
+        return IRQ_HANDLED;
 }
 
 static void yenta_interrupt_wrapper(unsigned long data)