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PM / devfreq: Strengthen check for freq_table

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Since commit ea572f8160 ("PM / devfreq: Change return type of
devfreq_set_freq_table()"), all devfreq devices are expected to have a
valid freq_table. The devfreq core unconditionally dereferences
freq_table in the sysfs code and in get_freq_range().

Therefore, we need to ensure that freq_table is both non-null and
non-empty (length is > 0). If either check fails, replace the table
using set_freq_table() or return the error.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Samuel Holland 2021-09-28 23:42:45 -05:00 committed by Chanwoo Choi
parent 14714135a8
commit 5cf79c2938
1 changed files with 1 additions and 1 deletions
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2
drivers/devfreq/devfreq.c
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@ -827,7 +827,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
goto err_dev;
}
if (!devfreq->profile->max_state && !devfreq->profile->freq_table) {
if (!devfreq->profile->max_state || !devfreq->profile->freq_table) {
mutex_unlock(&devfreq->lock);
err = set_freq_table(devfreq);
if (err < 0)