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gpiolib: fix filtering out unwanted events

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commit ad537b822577fcc143325786cd6ad50d7b9df31c upstream.

GPIOEVENT_REQUEST_BOTH_EDGES is not a single flag, but a binary OR of
GPIOEVENT_REQUEST_RISING_EDGE and GPIOEVENT_REQUEST_FALLING_EDGE.

The expression 'le->eflags & GPIOEVENT_REQUEST_BOTH_EDGES' we'll get
evaluated to true even if only one event type was requested.

Fix it by checking both RISING & FALLING flags explicitly.

Fixes: 61f922db7221 ("gpio: userspace ABI for reading GPIO line events")
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bartosz Golaszewski 2017-06-23 13:45:16 +02:00 committed by Greg Kroah-Hartman
parent cb2c6fdf62
commit 78c4244f8b
1 changed files with 2 additions and 1 deletions
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3
drivers/gpio/gpiolib.c
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@ -707,7 +707,8 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p)
ge.timestamp = ktime_get_real_ns();
if (le->eflags & GPIOEVENT_REQUEST_BOTH_EDGES) {
if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE
&& le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) {
int level = gpiod_get_value_cansleep(le->desc);
if (level)