From: Marc Zyngier <marc.zyngier@arm.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Heyi Guo <guoheyi@huawei.com>, Heyi Guo <heyi.guo@linaro.org>,
Lubomir Rintel <lkundrak@v3.sk>, Pavel Machek <pavel@ucw.cz>,
Zenghui Yu <yuzenghui@huawei.com>,
Zheng Xiang <zhengxiang9@huawei.com>,
Jason Cooper <jason@lakedaemon.net>,
linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] irqchip/gic-v3-its: Gracefully fail on LPI exhaustion
Date: Wed, 6 Feb 2019 10:48:46 +0000 [thread overview]
Message-ID: <20190206104848.12580-4-marc.zyngier@arm.com> (raw)
In-Reply-To: <20190206104848.12580-1-marc.zyngier@arm.com>
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>
---
drivers/irqchip/irq-gic-v3-its.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index f25ec92f23ee..c3aba3fc818d 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;
--
2.20.1
next prev parent reply other threads:[~2019-02-06 10:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-06 10:48 [PATCH 0/5] irqchip updates for 5.0-rc6 Marc Zyngier
2019-02-06 10:48 ` [PATCH 1/5] irqchip/gic-v4: Fix occasional VLPI drop Marc Zyngier
2019-02-06 10:48 ` [PATCH 2/5] irqchip/gic-v3-its: Plug allocation race for devices sharing a DevID Marc Zyngier
2019-02-06 10:48 ` Marc Zyngier [this message]
2019-02-06 10:48 ` [PATCH 4/5] irqchip/mmp: Only touch the PJ4 IRQ & FIQ bits on enable/disable Marc Zyngier
2019-02-06 10:48 ` [PATCH 5/5] irqchip/gic-v3-its: Fix ITT_entry_size accessor Marc Zyngier
2019-02-06 10:57 ` [PATCH 0/5] irqchip updates for 5.0-rc6 Marc Zyngier
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