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irqchip/gic-v3-its: Gracefully fail on LPI exhaustion

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[ Upstream commit 45725e0fc3 ]

In the unlikely event that we cannot find any available LPI in the
system, we should gracefully return an error instead of carrying
on with no LPI allocated at all.

Fixes: 38dd7c494c ("irqchip/gic-v3-its: Drop chunk allocation compatibility")
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marc Zyngier
2019-01-29 15:19:23 +00:00
committed by Greg Kroah-Hartman
parent dc81cfafb4
commit 423869f887
1 changed files with 3 additions and 0 deletions
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3
drivers/irqchip/irq-gic-v3-its.c
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@@ -1581,6 +1581,9 @@ static unsigned long *its_lpi_alloc(int nr_irqs, u32 *base, int *nr_ids)
nr_irqs /= 2;
} while (nr_irqs > 0);
if (!nr_irqs)
err = -ENOSPC;
if (err)
goto out;