Commit aa80869b authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/87a4xp35cn.ffs@tglx
parent 6de23f81

drivers/irqchip/irq-msi-lib.c

+3 −0
Original line number Diff line number Diff line
@@ -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? */