irqdomain: Protect the linear revmap with RCU

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It is pretty odd that the radix tree uses RCU while the linear
portion doesn't, leading to potential surprises for the users,
depending on how the irqdomain has been created.

Fix this by moving the update of the linear revmap under
the mutex, and the lookup under the RCU read-side lock.

The mutex name is updated to reflect that it doesn't only
cover the radix-tree anymore.

Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2021-04-05 12:57:27 +01:00

parent 48b15a7921

commit d4a45c68dc

2 changed files with 26 additions and 28 deletions

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5

include/linux/irqdomain.h

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49

kernel/irq/irqdomain.c

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