linux-kernel - Aw: Re: Re: [PATCH] pci: mediatek: fix warning in msi.h

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Date:   Wed, 4 Nov 2020 17:49:31 +0100
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Marc Zyngier <maz@...nel.org>, Ryder Lee <ryder.lee@...iatek.com>,
        linux-mediatek@...ts.infradead.org,
        Frank Wunderlich <linux@...web.de>,
        linux-kernel@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Aw: Re:  Re: [PATCH] pci: mediatek: fix warning in msi.h


> Gesendet: Dienstag, 03. November 2020 um 11:16 Uhr
> Von: "Thomas Gleixner" <tglx@...utronix.de>
> Any architecture which selects PCI_MSI_ARCH_FALLBACKS and does not have
> irqdomain support runs into:
>
> 	if (!d)
> 		bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
>
> which in turn makes pci_msi_supported() return 0 and consequently makes
> pci_enable_msi[x]() fail.

i'm not that deep into this, but just my thoughts...you are the experts :)

checking for PCI_MSI_ARCH_FALLBACKS here does not help?

something like this:

#ifndef PCI_MSI_ARCH_FALLBACKS
	if (!d)
		bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
#endif

imho pci_enable_msi[x]() does not do anything if there is no msi-support (or does not get called), so maybe check the PCI_BUS_FLAGS_NO_MSI before the call (if this is inside core) or inside the enable-function (if called from outside)....

or is this the issue marc talkes about (called before flag is set)?

regards Frank