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drivers/gpio PCA9555 - epoll_wait(2) misses first irq after setting an irq mask... #673

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drivers/gpio PCA9555 - epoll_wait(2) misses first irq after setting an irq mask... #673

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7 changes: 5 additions & 2 deletions drivers/gpio/gpio-pca953x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -716,13 +716,16 @@ static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
if (trigger[i])
trigger_seen = true;

/* We want the current status recorded in the chip->irq stat regardless the
* chip->irq_mask setting in order to have a change detected when the interrupt
* mask gets changed i.e. echo "both" > /sys/class/gpioXYZ/edge */
chip->irq_stat[i] = cur_stat[i];
}

if (!trigger_seen)
return false;

memcpy(chip->irq_stat, cur_stat, NBANK(chip));

for (i = 0; i < NBANK(chip); i++) {
pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
(cur_stat[i] & chip->irq_trig_raise[i]);
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