diff options
| author | Alexander Stein <alexander.stein@systec-electronic.com> | 2017-01-30 12:35:28 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-01-30 15:53:57 +0100 |
| commit | cdca06e4e85974d8a3503ab15709dbbaf90d3dd1 (patch) | |
| tree | 268b0c01070a957006db97c88dccb5fb061440ff | |
| parent | 1b89970d81bbd52720fc64a3fe9572ee33588363 (diff) | |
pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler
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.
Cc: stable@vger.kernel.org
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>
| -rw-r--r-- | drivers/pinctrl/intel/pinctrl-baytrail.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c index 05ba052ff6b9..d94aef17348b 100644 --- a/drivers/pinctrl/intel/pinctrl-baytrail.c +++ b/drivers/pinctrl/intel/pinctrl-baytrail.c @@ -1623,7 +1623,9 @@ 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); |