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staging: greybus: light: check delay_{on|off} before use 

Even though we trust leds core that the pointers should be valid, we are
safer to check delay_{on|off} before use.

Also, this avoid a smatch warning:
drivers/staging/greybus/light.c:484 gb_blink_set()
warn: variable dereferenced before check 'delay_on' (see line 476)

Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rui Miguel Silva 2016-09-30 19:24:33 +01:00 committed by Greg Kroah-Hartman
parent 3855eeec1a
commit dc875c7790
1 changed files with 3 additions and 0 deletions
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3
drivers/staging/greybus/light.c
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@ -463,6 +463,9 @@ static int gb_blink_set(struct led_classdev *cdev, unsigned long *delay_on,
if (channel->releasing)
return -ESHUTDOWN;
if (!delay_on || !delay_off)
return -EINVAL;
mutex_lock(&channel->lock);
ret = gb_pm_runtime_get_sync(bundle);
if (ret < 0)