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pwm: Fix period and polarity in pwm_get() for non-perfect matches

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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: 3796ce1d4d ("pwm: add period and polarity to struct pwm_lookup")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: stable@vger.kernel.org
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Geert Uytterhoeven 2014-08-13 17:18:53 +02:00 committed by Thierry Reding
parent 7d1311b93e
commit d717ea73e3
1 changed files with 6 additions and 2 deletions
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8
drivers/pwm/core.c
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@ -606,6 +606,8 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
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 *dev, const char *con_id)
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 *dev, const char *con_id)
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;