brcm2708: update against latest rpi-3.10.y branch
[openwrt.git] / target / linux / brcm2708 / patches-3.10 / 0067-Avoid-responding-to-unexpected-I2C-interrupts.patch
1 From 03f44ba654e40b60ffcec14030abf35152d0b639 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 067/174] Avoid responding to unexpected I2C interrupts
5
6 ---
7  drivers/i2c/busses/i2c-bcm2708.c | 6 ++++++
8  1 file changed, 6 insertions(+)
9
10 --- a/drivers/i2c/busses/i2c-bcm2708.c
11 +++ b/drivers/i2c/busses/i2c-bcm2708.c
12 @@ -175,6 +175,11 @@ static irqreturn_t bcm2708_i2c_interrupt
13  
14         spin_lock(&bi->lock);
15  
16 +       /* we may see camera interrupts on the "other" I2C channel
17 +           Just return if we've not sent anything */
18 +        if (!bi->nmsgs || !bi->msg )
19 +               goto early_exit;
20 +
21         s = bcm2708_rd(bi, BSC_S);
22  
23         if (s & (BSC_S_CLKT | BSC_S_ERR)) {
24 @@ -208,6 +213,7 @@ static irqreturn_t bcm2708_i2c_interrupt
25                 handled = false;
26         }
27  
28 +early_exit:
29         spin_unlock(&bi->lock);
30  
31         return handled ? IRQ_HANDLED : IRQ_NONE;