From aa80869b77e16d30ce69523528c63a2e2b050634 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 3 Feb 2026 22:05:44 +0100 Subject: [PATCH] irqchip/msi-lib: Refuse initialization when irq_write_msi_msg() is missing MSI parent domains rely on the fact that the top level device domain provides a irq_write_msi_msg() callback. Check for that and if missing warn and refuse to initialize the device domain. Signed-off-by: Thomas Gleixner Link: https://patch.msgid.link/87a4xp35cn.ffs@tglx --- drivers/irqchip/irq-msi-lib.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/irqchip/irq-msi-lib.c b/drivers/irqchip/irq-msi-lib.c index d5eefc3d7215..45e0ed3134ce 100644 --- a/drivers/irqchip/irq-msi-lib.c +++ b/drivers/irqchip/irq-msi-lib.c @@ -48,6 +48,9 @@ bool msi_lib_init_dev_msi_info(struct device *dev, struct irq_domain *domain, return false; } + if (WARN_ON_ONCE(!chip->irq_write_msi_msg)) + return false; + required_flags = pops->required_flags; /* Is the target domain bus token supported? */