This is a note to let you know that I've just added the patch titled
misc: atmel_pwm: add deferred-probing support
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
misc-atmel_pwm-add-deferred-probing-support.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5c6d6fd1564138ad048564e48639f842714a90c6 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Tue, 22 Oct 2013 18:32:39 +0200
Subject: misc: atmel_pwm: add deferred-probing support
From: Johan Hovold <jhovold@xxxxxxxxx>
commit 5c6d6fd1564138ad048564e48639f842714a90c6 upstream.
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@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/atmel_pwm.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/misc/atmel_pwm.c
+++ b/drivers/misc/atmel_pwm.c
@@ -90,8 +90,10 @@ int pwm_channel_alloc(int index, struct
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)
Patches currently in stable-queue which might be from jhovold@xxxxxxxxx are
queue-3.12/backlight-atmel-pwm-bl-fix-deferred-probe-from-__init.patch
queue-3.12/misc-atmel_pwm-add-deferred-probing-support.patch
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