From: Marc Zyngier <marc.zyngier@arm.com>
Date: Tue, 29 Jan 2019 15:19:23 +0000 (+0000)
Subject: irqchip/gic-v3-its: Gracefully fail on LPI exhaustion
X-Git-Tag: v4.19.29~66
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=423869f8871dee4028b67fa30f660ab43d14cfb2;p=platform%2Fkernel%2Flinux-rpi.git

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

[ Upstream commit 45725e0fc3e7fe52fedb94f59806ec50e9618682 ]

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: 38dd7c494cf6 ("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>
---

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index d9a8801..15579cb 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -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;