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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2016-07-08 14:30:46 +0300
committerLinus Walleij <linus.walleij@linaro.org>2016-07-11 11:15:33 +0200
commit9a520fd99f2c3feb178d6d05e347beb9017dc07b (patch)
treebbb76e6994d930ce8a7c014020e3c68f26d19c35 /drivers/pinctrl
parenta6e5e4a6243d7afce486d89c32481564bf669844 (diff)
downloadlinux-9a520fd99f2c3feb178d6d05e347beb9017dc07b.tar.bz2
pinctrl: intel: Protect set wake flow by spin lock
It seems intel_gpio_irq_wake() misses lock protection against I/O flow. Use spin lock here as well. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/intel/pinctrl-intel.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index fe19b1e7b278..257cab129692 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -796,12 +796,15 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
const struct intel_community *community;
unsigned pin = irqd_to_hwirq(d);
unsigned padno, gpp, gpp_offset;
+ unsigned long flags;
u32 gpe_en;
community = intel_get_community(pctrl, pin);
if (!community)
return -EINVAL;
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+
padno = pin_to_padno(community, pin);
gpp = padno / community->gpp_size;
gpp_offset = padno % community->gpp_size;
@@ -821,6 +824,8 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
gpe_en &= ~BIT(gpp_offset);
writel(gpe_en, community->regs + GPI_GPE_EN + gpp * 4);
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+
dev_dbg(pctrl->dev, "%sable wake for pin %u\n", on ? "en" : "dis", pin);
return 0;
}