This is a note to let you know that I've just added the patch titled
pwm: Fix period and polarity in pwm_get() for non-perfect matches
to the 3.16-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:
pwm-fix-period-and-polarity-in-pwm_get-for-non-perfect-matches.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d717ea73e36dd5659640fae82605ad85c4117f4d Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Date: Wed, 13 Aug 2014 17:18:53 +0200
Subject: pwm: Fix period and polarity in pwm_get() for non-perfect matches
From: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
commit d717ea73e36dd5659640fae82605ad85c4117f4d upstream.
If pwm_get() finds a look-up entry with a perfect match (both dev_id and
con_id match), the loop is aborted, and "p" still points to the correct
struct pwm_lookup.
If only an entry with a matching dev_id or con_id is found, the loop
terminates after traversing the whole list, and "p" now points to
arbitrary memory, not part of the pwm_lookup list.
Then pwm_set_period() and pwm_set_polarity() will set random values for
period resp. polarity.
To fix this, save period and polarity when finding a new best match,
just like is done for chip (for the provider) and index.
This fixes the LCD backlight on r8a7740/armadillo-legacy, which was fed
period 0 and polarity -1068821144 instead of 33333 resp. 1.
Fixes: 3796ce1d4d4b ("pwm: add period and polarity to struct pwm_lookup")
Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pwm/core.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -606,6 +606,8 @@ struct pwm_device *pwm_get(struct device
unsigned int best = 0;
struct pwm_lookup *p;
unsigned int match;
+ unsigned int period;
+ enum pwm_polarity polarity;
/* look up via DT first */
if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
@@ -653,6 +655,8 @@ struct pwm_device *pwm_get(struct device
if (match > best) {
chip = pwmchip_find_by_name(p->provider);
index = p->index;
+ period = p->period;
+ polarity = p->polarity;
if (match != 3)
best = match;
@@ -668,8 +672,8 @@ struct pwm_device *pwm_get(struct device
if (IS_ERR(pwm))
return pwm;
- pwm_set_period(pwm, p->period);
- pwm_set_polarity(pwm, p->polarity);
+ pwm_set_period(pwm, period);
+ pwm_set_polarity(pwm, polarity);
return pwm;
Patches currently in stable-queue which might be from geert+renesas@xxxxxxxxx are
queue-3.16/pwm-fix-period-and-polarity-in-pwm_get-for-non-perfect-matches.patch
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