irqchip/qcom-pdc: Fix broken locking

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pdc_enable_intr() serves as a primitive to qcom_pdc_gic_{en,dis}able,
and has a raw spinlock for mutual exclusion, which is uses with
interruptible primitives.

This means that this critical section can itself be interrupted.
Should the interrupt also be a PDC interrupt, and the endpoint driver
perform an irq_disable() on that interrupt, we end-up in a deadlock.

Fix this by using the irqsave/irqrestore variants of the locking
primitives.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Maulik Shah <quic_mkshah@quicinc.com>
Link: https://lore.kernel.org/r/20220224101226.88373-5-maz@kernel.org

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This commit is contained in:

Marc Zyngier 2022-02-24 10:12:25 +00:00

parent d494d088ac

commit a6aca2f460

1 changed files with 3 additions and 2 deletions

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drivers/irqchip/qcom-pdc.c

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