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| author | David Daney <david.daney@cavium.com> | 2011-10-31 17:12:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-31 17:30:55 -0700 |
| commit | dabc69c24271bd6ac126e3dda4f2d72234da81df (patch) | |
| tree | e2cf563d11e2391112dcfc2ae310425286435a87 /drivers/leds | |
| parent | 93f539822ed60e18cd7fb417bff4efa1833af9f2 (diff) | |
| download | linux-dabc69c24271bd6ac126e3dda4f2d72234da81df.tar.gz linux-dabc69c24271bd6ac126e3dda4f2d72234da81df.tar.bz2 linux-dabc69c24271bd6ac126e3dda4f2d72234da81df.zip | |
drivers/leds/leds-gpio.c: use gpio_get_value_cansleep() when initializing
I get the following warning:
------------[ cut here ]------------
WARNING: at drivers/gpio/gpiolib.c:1559 __gpio_get_value+0x90/0x98()
Modules linked in:
Call Trace:
[<ffffffff81440950>] dump_stack+0x8/0x34
[<ffffffff81141478>] warn_slowpath_common+0x78/0xa0
[<ffffffff812f0958>] __gpio_get_value+0x90/0x98
[<ffffffff81434f04>] create_gpio_led+0xdc/0x194
[<ffffffff8143524c>] gpio_led_probe+0x290/0x36c
[<ffffffff8130e8b0>] driver_probe_device+0x78/0x1b0
[<ffffffff8130eaa8>] __driver_attach+0xc0/0xc8
[<ffffffff8130d7ac>] bus_for_each_dev+0x64/0xb0
[<ffffffff8130e130>] bus_add_driver+0x1c8/0x2a8
[<ffffffff8130f100>] driver_register+0x90/0x180
[<ffffffff81100438>] do_one_initcall+0x38/0x160
---[ end trace ee38723fbefcd65c ]---
My GPIOs are on an I2C port expander, so we must use the *_cansleep()
variant of the GPIO functions. This is was not being done in
create_gpio_led().
We can change gpio_get_value() to gpio_get_value_cansleep() because it is
only called from the platform_driver probe function, which is a context
where we can sleep.
Only tested on my gpio_cansleep() system, but it seems safe for all
systems.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Acked-by: Trent Piepho <tpiepho@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/leds-gpio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index 3d8bc327a68d..504cc26c7e4b 100644 --- a/drivers/leds/leds-gpio.c +++ b/drivers/leds/leds-gpio.c @@ -121,7 +121,7 @@ static int __devinit create_gpio_led(const struct gpio_led *template, } led_dat->cdev.brightness_set = gpio_led_set; if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) - state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low; + state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low; else state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; |