Commit 5c6d6fd1 authored Oct 22, 2013 by Johan Hovold Committed by Greg Kroah-Hartman Oct 29, 2013

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 <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 50f67a06

drivers/misc/atmel_pwm.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -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)

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