irqchip/gic-v3: Only provision redistributors that are enabled in ACPI

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[ Upstream commit 926b5dfa6b ]

We currently allocate redistributor region structures for
individual redistributors when ACPI doesn't present us with
compact MMIO regions covering multiple redistributors.

It turns out that we allocate these structures even when
the redistributor is flagged as disabled by ACPI. It works
fine until someone actually tries to tarse one of these
structures, and access the corresponding MMIO region.

Instead, track the number of enabled redistributors, and
only allocate what is required. This makes sure that there
is no invalid data to misuse.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reported-by: Heyi Guo <guoheyi@huawei.com>
Tested-by: Heyi Guo <guoheyi@huawei.com>
Link: https://lore.kernel.org/r/20191216062745.63397-1-guoheyi@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Marc Zyngier 2019-12-16 11:24:57 +00:00 • committed by Greg Kroah-Hartman

parent c7ef30f0a5

commit 28fb656e75

1 changed files with 7 additions and 2 deletions

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drivers/irqchip/irq-gic-v3.c

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