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-Url: http://git.maquefel.me/?a=commitdiff_plain;h=45725e0fc3e7fe52fedb94f59806ec50e9618682;p=linux.git

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

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>
---

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index f25ec92f23ee2..c3aba3fc818d3 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1586,6 +1586,9 @@ 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;