linux-kernel - Re: [PATCH] PCI: MSI: Only use the generic MSI layer when domain is hierarchical

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Date:	Mon, 23 Nov 2015 18:38:28 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Marc Zyngier <marc.zyngier@....com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Phil Edworthy <phil.edworthy@...esas.com>,
	linux-kernel@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH] PCI: MSI: Only use the generic MSI layer when domain is
 hierarchical

On Mon, 23 Nov 2015, Marc Zyngier wrote:

> Since d8a1cb757550 ("PCI/MSI: Let pci_msi_get_domain use struct
> device::msi_domain"), we use the MSI domain associated to the PCI device.
> 
> But finding a MSI domain doesn't mean that the domain is implemented
> using the generic MSI domain API, and a number of MSI controllers
> are still using the arch_setup_msi_irq/arch_teardown_msi_irqs.
> 
> In order to avoid a firework on these systems, check that the domain
> we just obtained is hierarchical. If not, don't use the generic MSI
> stuff and stick with the old one. Not pretty, but reliable.
> 
> Another insentive to rework those drivers and phase out this API.
> 
> Reported-by: Phil Edworthy <phil.edworthy@...esas.com>
> Tested-by: Phil Edworthy <phil.edworthy@...esas.com>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Acked-by: Thomas Gleixner <tglx@...utronix.de>
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