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authorMark Walton <mark.walton@serialtek.com>2019-02-28 18:46:36 +0300
committerLinus Walleij <linus.walleij@linaro.org>2019-03-01 13:55:32 +0300
commitc378b3aa015931a46c91d6ccc2fe04d97801d060 (patch)
tree631dd23e990896936531e47f31e20e1f774b9402 /drivers/gpio
parente226e3c33ab0562784a22870858eb5551d780ce7 (diff)
downloadlinux-c378b3aa015931a46c91d6ccc2fe04d97801d060.tar.xz
gpio: pca953x: Fix dereference of irq data in shutdown
If a PCA953x gpio was used as an interrupt and then released, the shutdown function was trying to extract the pca953x_chip pointer directly from the irq_data, but in reality was getting the gpio_chip structure. The net effect was that the subsequent writes to the data structure corrupted data in the gpio_chip structure, which wasn't immediately obvious until attempting to use the GPIO again in the future, at which point the kernel panics. This fix correctly extracts the pca953x_chip structure via the gpio_chip structure, as is correctly done in the other irq functions. Fixes: 0a70fe00efea ("gpio: pca953x: Clear irq trigger type on irq shutdown") Cc: stable@vger.kernel.org Signed-off-by: Mark Walton <mark.walton@serialtek.com> Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-pca953x.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index caf7dd1d5e16..6bd55a49585b 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -659,7 +659,8 @@ static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
static void pca953x_irq_shutdown(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = gpiochip_get_data(gc);
u8 mask = 1 << (d->hwirq % BANK_SZ);
chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;