target/linux/brcm2708/patches-3.10/0067-Avoid-responding-to-unexpected-I2C-interrupts.patch

   1 From ed5a728f2593fbd3950c5c17ab7143bafc295e57 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Thu, 13 Jun 2013 16:46:54 +0100
   4 Subject: [PATCH 067/196] Avoid responding to unexpected I2C interrupts
   5
   6 ---
   7  drivers/i2c/busses/i2c-bcm2708.c | 6 ++++++
   8  1 file changed, 6 insertions(+)
   9
  10 diff --git a/drivers/i2c/busses/i2c-bcm2708.c b/drivers/i2c/busses/i2c-bcm2708.c
  11 index edc90c0..33f4e7d 100644
  12 --- a/drivers/i2c/busses/i2c-bcm2708.c
  13 +++ b/drivers/i2c/busses/i2c-bcm2708.c
  14 @@ -175,6 +175,11 @@ static irqreturn_t bcm2708_i2c_interrupt(int irq, void *dev_id)
  15
  16         spin_lock(&bi->lock);
  17
  18 +       /* we may see camera interrupts on the "other" I2C channel
  19 +           Just return if we've not sent anything */
  20 +        if (!bi->nmsgs || !bi->msg )
  21 +               goto early_exit;
  22 +
  23         s = bcm2708_rd(bi, BSC_S);
  24
  25         if (s & (BSC_S_CLKT | BSC_S_ERR)) {
  26 @@ -208,6 +213,7 @@ static irqreturn_t bcm2708_i2c_interrupt(int irq, void *dev_id)
  27                 handled = false;
  28         }
  29
  30 +early_exit:
  31         spin_unlock(&bi->lock);
  32
  33         return handled ? IRQ_HANDLED : IRQ_NONE;
  34 --
  35 1.9.1
  36