tree c509d3c40a6cf6d75c7f4b34d62b2875fdf617e1
parent 6a0712f6f199e737aa5913d28ec4bd3a25de9660
author Jon Hunter <jonathanh@nvidia.com> 1455189959 +0000
committer Rafael J. Wysocki <rafael.j.wysocki@intel.com> 1455224738 +0100

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

Commit 7d34d56ef334 (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: 7d34d56ef334 (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>