From: Johan Hovold Date: Tue, 22 Oct 2013 16:32:39 +0000 (+0200) Subject: misc: atmel_pwm: add deferred-probing support X-Git-Tag: v3.13-rc1~173^2~8 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5c6d6fd1564138ad048564e48639f842714a90c6;p=kernel%2Fkernel-generic.git misc: atmel_pwm: add deferred-probing support Two drivers (atmel-pwm-bl and leds-atmel-pwm) currently depend on the atmel_pwm driver to have bound to any pwm-device before their devices are probed. Support deferred probing of such devices by making sure to return -EPROBE_DEFER from pwm_channel_alloc when no pwm-device has yet been bound. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/atmel_pwm.c b/drivers/misc/atmel_pwm.c index 494d050..a6dc56e 100644 --- a/drivers/misc/atmel_pwm.c +++ b/drivers/misc/atmel_pwm.c @@ -90,8 +90,10 @@ int pwm_channel_alloc(int index, struct pwm_channel *ch) unsigned long flags; int status = 0; - /* insist on PWM init, with this signal pinned out */ - if (!pwm || !(pwm->mask & 1 << index)) + if (!pwm) + return -EPROBE_DEFER; + + if (!(pwm->mask & 1 << index)) return -ENODEV; if (index < 0 || index >= PWM_NCHAN || !ch)