6.16-stable review patch. If anyone has any objections, please let me know.
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From: Elad Nachman enachman@marvell.com
[ Upstream commit 3c3d7dbab2c70a4bca47634d564bf659351c05ca ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/irqchip/irq-mvebu-gicp.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/irqchip/irq-mvebu-gicp.c b/drivers/irqchip/irq-mvebu-gicp.c index d3232d6d8dce..fd85c845e015 100644 --- a/drivers/irqchip/irq-mvebu-gicp.c +++ b/drivers/irqchip/irq-mvebu-gicp.c @@ -177,6 +177,7 @@ static int mvebu_gicp_probe(struct platform_device *pdev) .ops = &gicp_domain_ops, }; struct mvebu_gicp *gicp; + void __iomem *base; int ret, i;
gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL); @@ -236,6 +237,15 @@ static int mvebu_gicp_probe(struct platform_device *pdev) 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; }