linux-kernel - Re: [PATCH 0/8 v2] PCI: Align return values of PCIe capability and PCI accessors

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Message-ID: <20200615134650.GA2030477@ziepe.ca>
Date:   Mon, 15 Jun 2020 10:46:50 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     refactormyself@...il.com
Cc:     helgaas@...nel.org, bjorn@...gaas.com, skhan@...uxfoundation.org,
        linux-pci@...r.kernel.org, Vinod Koul <vkoul@...nel.org>,
        dmaengine@...r.kernel.org,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        Don Brace <don.brace@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        esc.storagedev@...rosemi.com, linux-scsi@...r.kernel.org,
        Russell Currey <ruscur@...sell.cc>,
        Sam Bobroff <sbobroff@...ux.ibm.com>,
        Oliver O'Halloran <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8 v2] PCI: Align return values of PCIe capability and
 PCI accessors

On Mon, Jun 15, 2020 at 09:32:17AM +0200, refactormyself@...il.com wrote:
> From: Bolarinwa Olayemi Saheed <refactormyself@...il.com>
> 
> 
> PATCH 1/8 to 7/8:
> PCIBIOS_ error codes have positive values and they are passed down the
> call heirarchy from accessors. For functions which are meant to return
> only a negative value on failure, passing on this value is a bug.
> To mitigate this, call pcibios_err_to_errno() before passing on return
> value from PCIe capability accessors call heirarchy. This function
> converts any positive PCIBIOS_ error codes to negative generic error
> values.
> 
> PATCH 8/8:
> The PCIe capability accessors can return 0, -EINVAL, or any PCIBIOS_ error
> code. The pci accessor on the other hand can only return 0 or any PCIBIOS_
> error code.This inconsistency among these accessor makes it harder for
> callers to check for errors.
> Return PCIBIOS_BAD_REGISTER_NUMBER instead of -EINVAL in all PCIe
> capability accessors.
> 
> MERGING:
> These may all be merged via the PCI tree, since it is a collection of
> similar fixes. This way they all get merged at once.

I prefer this not happen for active trees, it just risks needless
merge conflicts.

I will take the hfi1 patches at least, let me know when they are
reviewed

Thanks,
Jason