iommu/arm-smmu: Don't BUG() if we find aborting STEs with disable_bypass

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commit 5bc0a11664 upstream.

The disable_bypass cmdline option changes the SMMUv3 driver to put down
faulting stream table entries by default, as opposed to bypassing
transactions from unconfigured devices.

In this mode of operation, it is entirely expected to see aborting
entries in the stream table if and when we come to installing a valid
translation, so don't trigger a BUG() as a result of misdiagnosing these
entries as stream table corruption.

Fixes: 48ec83bcbc ("iommu/arm-smmu: Add initial driver support for ARM SMMUv3 devices")
Tested-by: Robin Murphy <robin.murphy@arm.com>
Reported-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Will Deacon 2016-08-16 14:29:16 +01:00 • committed by Greg Kroah-Hartman

parent aef62956c8

commit d860213f8b

1 changed files with 3 additions and 0 deletions

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drivers/iommu/arm-smmu-v3.c

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