iommu/arm-smmu: Disable interrupts whilst holding the cmdq lock

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The cmdq lock is taken whenever we issue commands into the command queue,
which can occur in IRQ context (as a result of unmap) or in process
context (as a result of a threaded IRQ handler or device probe).

This can lead to a theoretical deadlock if the interrupt handler
performing the unmap hits whilst the lock is taken, so explicitly use
the {irqsave,irqrestore} spin_lock accessors for the cmdq lock.

Tested-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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This commit is contained in:

Will Deacon 2016-09-09 14:33:59 +01:00

parent bcfced1580

commit 8ded2909e2

1 changed files with 3 additions and 2 deletions

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5

drivers/iommu/arm-smmu-v3.c

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