pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
commit cdca06e4e8
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>
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@ -1612,7 +1612,9 @@ static void byt_gpio_irq_handler(struct irq_desc *desc)
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continue;
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}
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raw_spin_lock(&vg->lock);
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pending = readl(reg);
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raw_spin_unlock(&vg->lock);
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for_each_set_bit(pin, &pending, 32) {
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virq = irq_find_mapping(vg->chip.irqdomain, base + pin);
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generic_handle_irq(virq);
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