linux-kernel - Re: [PATCH V3 1/2] PCI: Add Extended Tags quirk for Broadcom HT2100 Root Port

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Date:   Tue, 11 Jul 2017 16:16:23 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        wim.ten.have@...cle.com, linux-arm-msm@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V3 1/2] PCI: Add Extended Tags quirk for Broadcom HT2100
 Root Port

On 7/11/2017 3:58 PM, Bjorn Helgaas wrote:
> I'm trying to avoid pci_walk_bus() because it's such a minefield as
> far as hot-added devices.  I don't think we can avoid one in the
> quirk, to turn off extended tags for any devices we've already found,
> but I think we *can* avoid adding more i

Jike Song asked what if you attach a PCIe endpoint that has an extended
tags quirk to think about the reverse direction. That's why, I was walking
the entire bus. 

We can maybe hold onto putting such a generic code until such a device
with quirk actually shows up.

I'll pull your suggestion into a patch, give it a try and then post the
next version.

-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.