linux-kernel - Re: [PATCH] PCI: Fix endianness issues in pci_bus_read

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Message-ID: <8d5b5e0450ac4a4f8ca0a9d7b9399a7b0b5eee00.camel@linux.ibm.com>
Date: Wed, 13 Aug 2025 09:47:50 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Hans Zhang <18255117159@....com>, Gerd Bayer <gbayer@...ux.ibm.com>,
        Manivannan Sadhasivam
	 <mani@...nel.org>,
        Hans Zhang <hans.zhang@...tech.com>
Cc: Arnd Bergmann <arnd@...nel.org>, Bjorn Helgaas <helgaas@...nel.org>,
        bhelgaas@...gle.com, Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian
 Borntraeger <borntraeger@...ux.ibm.com>,
        Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>,
        jingoohan1@...il.com,
        Krzysztof
 Wilczyński	 <kwilczynski@...nel.org>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-next
 <linux-next@...r.kernel.org>, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi
 <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>, geert@...ux-m68k.org
Subject: Re: [PATCH] PCI: Fix endianness issues in pci_bus_read_config()

On Tue, 2025-08-12 at 22:44 +0800, Hans Zhang wrote:
> 
> On 2025/8/4 18:09, Gerd Bayer wrote:
> > On Mon, 2025-08-04 at 11:06 +0800, Hans Zhang wrote:
> > > 
> > > On 2025/8/1 19:30, Gerd Bayer wrote:
> > > > On Fri, 2025-08-01 at 16:24 +0530, Manivannan Sadhasivam wrote:
> > > > 
> > > > <--- snip --->
> > > > 
> > > > > > > 
> > > 
> > > Dear all,
> > > 
> > > According to the issue mentioned by Lukas and Mani. Gerd has already
> > > been tested on the s390. I have tested it on the RK3588 and it works
> > > fine. RK3588 uses Synopsys' PCIe IP, that is, the DWC driver. Our
> > > company's is based on Cadence's PCIe 4.0 IP, and the test function is
> > > normal. All the platforms I tested were based on ARM.
> > > 
> > > The following is the patch based on the capability-search branch. May I
> > > ask everyone, do you have any more questions?
> > > 
> > > Gerd, if there's no problem, I'll add your Tested-by label.
> > 
> > Before you add that I'd like to re-test with the "final" patch.
> > 
> > > Branch:
> > > https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/log/?h=capability-search
> > > 
> > > Patch:
> > 
> > <--- snip --->
> > 
> > Please bear with me while I'm working on that.
> 
> 
> Dear Gerd,
> 
> May I ask if there is any update?
> 
> 
> 
> I plan to submit the v15 version of my series based on v6.17-rc1.
> The modification method is like the previous comment:
> https://lore.kernel.org/linux-pci/06012cc6-824d-4a7d-85c9-9995ec915382@163.com/
> 
> Best regards,
> Hans
> 

Hi Hans,

Gerd is currently out so I just gave the patch you provided against
capability-search-v14 a try on s390. Didn't see any issues with the
previously broken device probing. As I understand it Bjorn asked you to
send a complete v15 and then for people to test that. I like that
approach and would prefer to provide a Tested-by for v15 rather than
via a patch on top. Gerd should be back next week too. Does that work
for you?

Thanks,
Niklas Schnelle