cbus-retu: Add IRQ handler locking

SVN-Revision: 25796

diff --git a/target/linux/omap24xx/patches-2.6.38/506-cbus-retu-irq-handler-locking.patch b/target/linux/omap24xx/patches-2.6.38/506-cbus-retu-irq-handler-locking.patch
new file mode 100644 (file)
index 0000000..364ffa3
--- /dev/null
+++ b/target/linux/omap24xx/patches-2.6.38/506-cbus-retu-irq-handler-locking.patch
@@ -0,0 +1,18 @@
+Index: linux-2.6.38-rc6/drivers/cbus/retu.c
+===================================================================
+--- linux-2.6.38-rc6.orig/drivers/cbus/retu.c  2011-02-28 15:21:10.645505891 +0100
++++ linux-2.6.38-rc6/drivers/cbus/retu.c       2011-02-28 15:22:24.030477769 +0100
+@@ -198,10 +198,12 @@ static irqreturn_t retu_irq_handler(int
+       u16                     idr;
+       u16                     imr;
+ 
++      mutex_lock(&retu->mutex);
+       idr = __retu_read_reg(retu, RETU_REG_IDR);
+       imr = __retu_read_reg(retu, RETU_REG_IMR);
+-      idr &= ~imr;
++      mutex_unlock(&retu->mutex);
+ 
++      idr &= ~imr;
+       if (!idr) {
+               dev_vdbg(retu->dev, "No IRQ, spurious?\n");
+               return IRQ_NONE;