linux-kernel - [PATCH] irqchip/msi-lib: Refuse initialization when irq_write_msi

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Message-ID: <87a4xp35cn.ffs@tglx>
Date: Tue, 03 Feb 2026 22:05:44 +0100
From: Thomas Gleixner <tglx@...nel.org>
To: Anup Patel <anup@...infault.org>
Cc: Yingjun Ni <yingjun.ni@...cv-computing.com>, pjw@...nel.org,
 palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr,
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, Marc
 Zyngier <maz@...nel.org>
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 <tglx@...nel.org>
---
 drivers/irqchip/irq-msi-lib.c |    3 +++
 1 file changed, 3 insertions(+)

--- 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 de
 		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? */