From 5c6d6fd1564138ad048564e48639f842714a90c6 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Tue, 22 Oct 2013 18:32:39 +0200 Subject: [PATCH] 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 --- drivers/misc/atmel_pwm.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/misc/atmel_pwm.c b/drivers/misc/atmel_pwm.c index 494d0500bda6..a6dc56e1bc58 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)