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| author | Sumeet Pawnikar <sumeet4linux@gmail.com> | 2025-12-05 22:02:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-01-17 18:30:01 +0300 |
| commit | e07dea55aa13435d048ee4bc7ee2d02c4491b47e (patch) | |
| tree | 0246e8872520eb0153dcdf6b452d06222aebc12a /tools/perf/scripts/python/stackcollapse.py | |
| parent | 98676ee71fd4eafeb8be63c7f3f1905d40e03101 (diff) | |
| download | linux-e07dea55aa13435d048ee4bc7ee2d02c4491b47e.tar.xz | |
powercap: fix race condition in register_control_type()
[ Upstream commit 7bda1910c4bccd4b8d4726620bb3d6bbfb62286e ]
The device becomes visible to userspace via device_register()
even before it fully initialized by idr_init(). If userspace
or another thread tries to register a zone immediately after
device_register(), the control_type_valid() will fail because
the control_type is not yet in the list. The IDR is not yet
initialized, so this race condition causes zone registration
failure.
Move idr_init() and list addition before device_register()
fix the race condition.
Signed-off-by: Sumeet Pawnikar <sumeet4linux@gmail.com>
[ rjw: Subject adjustment, empty line added ]
Link: https://patch.msgid.link/20251205190216.5032-1-sumeet4linux@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/stackcollapse.py')
0 files changed, 0 insertions, 0 deletions