regmap: Fix race condition in hwspinlock irqsave routine

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[ Upstream commit 4b58aac989 ]

Previously, the address of the shared member '&map->spinlock_flags' was
passed directly to 'hwspin_lock_timeout_irqsave'. This creates a race
condition where multiple contexts contending for the lock could overwrite
the shared flags variable, potentially corrupting the state for the
current lock owner.

Fix this by using a local stack variable 'flags' to store the IRQ state
temporarily.

Fixes: 8698b93647 ("regmap: Add hardware spinlock support")
Signed-off-by: Cheng-Yu Lee <cylee12@realtek.com>
Co-developed-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Link: https://patch.msgid.link/20260109032633.8732-1-eleanor.lin@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Cheng-Yu Lee 2026-01-09 11:26:33 +08:00 • committed by Greg Kroah-Hartman

parent 346775f2b4

commit 4aab0ca0a0

1 changed files with 3 additions and 1 deletions

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drivers/base/regmap/regmap.c

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