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opp: Don't use IS_ERR on invalid supplies 

_set_opp_custom() receives a set of OPP supplies as its arguments and
the caller of it passes NULL when the supplies are not valid. But
_set_opp_custom(), by mistake, checks for error by performing
IS_ERR(old_supply) on it which will always evaluate to false.

The problem was spotted during of testing of upcoming update for the
NVIDIA Tegra CPUFreq driver.

Cc: stable <stable@vger.kernel.org>
Fixes: 7e535993fa ("OPP: Separate out custom OPP handler specific code")
Reported-by: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[ Viresh: Massaged changelog ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Dmitry Osipenko 2019-06-23 20:50:53 +03:00 committed by Viresh Kumar
parent cd7ea58286
commit 560d1bcad7
1 changed files with 1 additions and 1 deletions
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2
drivers/opp/core.c
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@ -685,7 +685,7 @@ static int _set_opp_custom(const struct opp_table *opp_table,
data->old_opp.rate = old_freq;
size = sizeof(*old_supply) * opp_table->regulator_count;
if (IS_ERR(old_supply))
if (!old_supply)
memset(data->old_opp.supplies, 0, size);
else
memcpy(data->old_opp.supplies, old_supply, size);