From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Martin Kaiser <martin@kaiser.cx>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Sasha Levin <sashal@kernel.org>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 4.9 07/10] PCI: xgene-msi: Fix race in installing chained irq handler
Date: Tue, 2 Mar 2021 06:59:18 -0500 [thread overview]
Message-ID: <20210302115921.63636-7-sashal@kernel.org> (raw)
In-Reply-To: <20210302115921.63636-1-sashal@kernel.org>
From: Martin Kaiser <martin@kaiser.cx>
[ Upstream commit a93c00e5f975f23592895b7e83f35de2d36b7633 ]
Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().
See also 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained IRQ
handler").
Based on the mail discussion, it seems ok to drop the error handling.
Link: https://lore.kernel.org/r/20210115212435.19940-3-martin@kaiser.cx
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/host/pci-xgene-msi.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/host/pci-xgene-msi.c b/drivers/pci/host/pci-xgene-msi.c
index a6456b578269..b6a099371ad2 100644
--- a/drivers/pci/host/pci-xgene-msi.c
+++ b/drivers/pci/host/pci-xgene-msi.c
@@ -393,13 +393,9 @@ static int xgene_msi_hwirq_alloc(unsigned int cpu)
if (!msi_group->gic_irq)
continue;
- irq_set_chained_handler(msi_group->gic_irq,
- xgene_msi_isr);
- err = irq_set_handler_data(msi_group->gic_irq, msi_group);
- if (err) {
- pr_err("failed to register GIC IRQ handler\n");
- return -EINVAL;
- }
+ irq_set_chained_handler_and_data(msi_group->gic_irq,
+ xgene_msi_isr, msi_group);
+
/*
* Statically allocate MSI GIC IRQs to each CPU core.
* With 8-core X-Gene v1, 2 MSI GIC IRQs are allocated
--
2.30.1
parent reply other threads:[~2021-03-03 2:02 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20210302115921.63636-1-sashal@kernel.org>]
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