i2c-pxa2xx: Don't clear isr bits too early

isr is passed later into i2c_pxa_irq_txempty and
i2c_pxa_irq_rxfull and they may use some other bits
than irq sources.

Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index b914184748c9..f59224a5c761 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -966,8 +966,7 @@ static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id)
         struct pxa_i2c *i2c = dev_id;
         u32 isr = readl(_ISR(i2c));
 
-        isr &= VALID_INT_SOURCE;
-        if (!isr)
+        if (!(isr & VALID_INT_SOURCE))
                 return IRQ_NONE;
 
         if (i2c_debug > 2 && 0) {
@@ -984,7 +983,7 @@ static irqreturn_t i2c_pxa_handler(int this_irq, void *dev_id)
         /*
          * Always clear all pending IRQs.
          */
-        writel(isr, _ISR(i2c));
+        writel(isr & VALID_INT_SOURCE, _ISR(i2c));
 
         if (isr & ISR_SAD)
                 i2c_pxa_slave_start(i2c, isr);