diff options
| author | Bartosz Golaszewski <brgl@bgdev.pl> | 2017-06-23 14:45:16 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-06-29 12:33:46 +0300 |
| commit | ad537b822577fcc143325786cd6ad50d7b9df31c (patch) | |
| tree | 0894a0efdc66032a12b792e2e40d0506732cde83 /drivers/gpio | |
| parent | c0bc126f97fb929b3ae02c1c62322645d70eb408 (diff) | |
| download | linux-ad537b822577fcc143325786cd6ad50d7b9df31c.tar.xz | |
gpiolib: fix filtering out unwanted events
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.
Cc: stable@vger.kernel.org
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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 5db44139cef8..a42a1eea5714 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -708,7 +708,8 @@ 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) |