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irqchip/mvebu-gicp: Clear pending interrupts on init

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When a kexec'ed kernel boots up, there might be stale unhandled interrupts
pending in the interrupt controller. These are delivered as spurious
interrupts once the boot CPU enables interrupts.

Clear all pending interrupts when the driver is initialized to prevent
these spurious interrupts from locking the CPU in an endless loop.

Signed-off-by: Elad Nachman <enachman@marvell.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250803102548.669682-2-enachman@marvell.com
This commit is contained in:
Elad Nachman 2025-08-03 13:25:48 +03:00 committed by Thomas Gleixner
parent 02cbf8e069
commit 3c3d7dbab2
1 changed files with 10 additions and 0 deletions
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10
drivers/irqchip/irq-mvebu-gicp.c
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@ -177,6 +177,7 @@ static int mvebu_gicp_probe(struct platform_device *pdev)
.ops = &gicp_domain_ops, .ops = &gicp_domain_ops,
}; };
struct mvebu_gicp *gicp; struct mvebu_gicp *gicp;
void __iomem *base;
int ret, i; int ret, i;
gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL); gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL);
@ -236,6 +237,15 @@ static int mvebu_gicp_probe(struct platform_device *pdev)
return -ENODEV; return -ENODEV;
} }
base = ioremap(gicp->res->start, gicp->res->end - gicp->res->start);
if (IS_ERR(base)) {
dev_err(&pdev->dev, "ioremap() failed. Unable to clear pending interrupts.\n");
} else {
for (i = 0; i < 64; i++)
writel(i, base + GICP_CLRSPI_NSR_OFFSET);
iounmap(base);
}
return msi_create_parent_irq_domain(&info, &gicp_msi_parent_ops) ? 0 : -ENOMEM; return msi_create_parent_irq_domain(&info, &gicp_msi_parent_ops) ? 0 : -ENOMEM;
} }