powercap: fix race condition in register_control_type()

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[ Upstream commit 7bda1910c4 ]

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>

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Sumeet Pawnikar 2025-12-06 00:32:16 +05:30 • committed by Greg Kroah-Hartman

parent cbbf6c1fe6

commit d33cc39e9f

1 changed files with 11 additions and 5 deletions

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drivers/powercap/powercap_sys.c

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