This is a note to let you know that I've just added the patch titled
leds: leds-pwm: properly clean up after probe failure
to the 3.10-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:
leds-leds-pwm-properly-clean-up-after-probe-failure.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 392369019eb96e914234ea21eda806cb51a1073e Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Date: Sun, 6 Apr 2014 15:20:03 -0700
Subject: leds: leds-pwm: properly clean up after probe failure
From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
commit 392369019eb96e914234ea21eda806cb51a1073e upstream.
When probing with DT, we add each LED one at a time. If we find a LED
without a PWM device (because it is not available yet) we fail the
initialisation, unregister previous LEDs, and then by way of managed
resources, we free the structure.
The problem with this is we may have a scheduled and active work_struct
in this structure, and this results in a nasty kernel oops.
We need to cancel this work_struct properly upon cleanup - and the
cleanup we require is the same cleanup as we do when the LED platform
device is removed. Rather than writing this same code three times,
move it into a separate function and use it in all three places.
Fixes: c971ff185f64 ("leds: leds-pwm: Defer led_pwm_set() if PWM can sleep")
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Bryan Wu <cooloney@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/leds/leds-pwm.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
--- a/drivers/leds/leds-pwm.c
+++ b/drivers/leds/leds-pwm.c
@@ -82,6 +82,15 @@ static inline size_t sizeof_pwm_leds_pri
(sizeof(struct led_pwm_data) * num_leds);
}
+static void led_pwm_cleanup(struct led_pwm_priv *priv)
+{
+ while (priv->num_leds--) {
+ led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
+ if (priv->leds[priv->num_leds].can_sleep)
+ cancel_work_sync(&priv->leds[priv->num_leds].work);
+ }
+}
+
static struct led_pwm_priv *led_pwm_create_of(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
@@ -139,8 +148,7 @@ static struct led_pwm_priv *led_pwm_crea
return priv;
err:
- while (priv->num_leds--)
- led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
+ led_pwm_cleanup(priv);
return NULL;
}
@@ -200,8 +208,8 @@ static int led_pwm_probe(struct platform
return 0;
err:
- while (i--)
- led_classdev_unregister(&priv->leds[i].cdev);
+ priv->num_leds = i;
+ led_pwm_cleanup(priv);
return ret;
}
@@ -209,13 +217,8 @@ err:
static int led_pwm_remove(struct platform_device *pdev)
{
struct led_pwm_priv *priv = platform_get_drvdata(pdev);
- int i;
- for (i = 0; i < priv->num_leds; i++) {
- led_classdev_unregister(&priv->leds[i].cdev);
- if (priv->leds[i].can_sleep)
- cancel_work_sync(&priv->leds[i].work);
- }
+ led_pwm_cleanup(priv);
return 0;
}
Patches currently in stable-queue which might be from rmk+kernel@xxxxxxxxxxxxxxxx are
queue-3.10/leds-leds-pwm-properly-clean-up-after-probe-failure.patch
queue-3.10/arm-8012-1-kdump-avoid-overflow-when-converting-pfn-to-physaddr.patch
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