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irqchip: gicv3-its: Zero itt before handling to hardware

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Some kind of brain-dead implementations chooses to insert ITEes in
rapid sequence of disabled ITEes, and an un-zeroed ITT will confuse
ITS on judging whether an ITE is really enabled or not. Considering
the implementations are still supported by the GICv3 architecture,
in which ITT is not required to be zeroed before being handled to
hardware, we do the favor in ITS driver.

Acked-by: Marc Zyngier <[email protected]>
Signed-off-by: Yun Wu <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jason Cooper <[email protected]>
This commit is contained in:
Yun Wu 2015-03-06 16:37:46 +00:00 • committed by Jason Cooper
commit 6c834125ba
1 changed files with 1 additions and 1 deletions
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drivers/irqchip/irq-gic-v3-its.c
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@ -1076,7 +1076,7 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
nr_ites = max(2UL, roundup_pow_of_two(nvecs));
sz = nr_ites * its->ite_size;
sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
itt = kmalloc(sz, GFP_KERNEL);
itt = kzalloc(sz, GFP_KERNEL);
lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis);
if (!dev || !itt || !lpi_map) {