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pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler

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commit cdca06e4e85974d8a3503ab15709dbbaf90d3dd1 upstream.

According to VLI64 Intel Atom E3800 Specification Update (#329901)
concurrent read accesses may result in returning 0xffffffff and write
accesses may be dropped silently.
To workaround all accesses must be protected by locks.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Stein 2017-01-30 12:35:28 +01:00 committed by Greg Kroah-Hartman
parent 7396685a1b
commit 20658b3df8
1 changed files with 2 additions and 0 deletions
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2
drivers/pinctrl/intel/pinctrl-baytrail.c
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@ -1612,7 +1612,9 @@ static void byt_gpio_irq_handler(struct irq_desc *desc)
continue;
}
raw_spin_lock(&vg->lock);
pending = readl(reg);
raw_spin_unlock(&vg->lock);
for_each_set_bit(pin, &pending, 32) {
virq = irq_find_mapping(vg->chip.irqdomain, base + pin);
generic_handle_irq(virq);