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PM / OPP: Fix NULL pointer dereference crash when disabling OPPs

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Commit 7d34d56ef3 (PM / OPP: Disable OPPs that aren't supported by
the regulator) causes a crash to happen on Tegra124 Jetson TK1 when
using the DFLL clock source for the CPU.  The DFLL manages the voltage
itself and so there is no regulator specified for the OPPs and so we
get a crash when we try to dereference the regulator pointer.  Fix
this by checking to see if the regulator IS_ERR_OR_NULL before
dereferencing it.

Fixes: 7d34d56ef3 (PM / OPP: Disable OPPs that aren't supported by the regulator)
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reported-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jon Hunter 2016-02-11 11:25:59 +00:00 committed by Rafael J. Wysocki
parent 6a0712f6f1
commit 78ecc56247
1 changed files with 1 additions and 1 deletions
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2
drivers/base/power/opp/core.c
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@ -975,7 +975,7 @@ static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
{
struct regulator *reg = dev_opp->regulator;
if (!IS_ERR(reg) &&
if (!IS_ERR_OR_NULL(reg) &&
!regulator_is_supported_voltage(reg, opp->u_volt_min,
opp->u_volt_max)) {
pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",