linux-kernel - RE: [PATCH 1/1] PCI/RCEC: Fix failure to inject errors to some RCiEP devices

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Message-ID: <610e4c558a654e15b2864d594d5b3902@intel.com>
Date:   Fri, 19 Feb 2021 01:51:11 +0000
From:   "Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>
To:     'Krzysztof Wilczyński' <kw@...ux.com>
CC:     Bjorn Helgaas <helgaas@...nel.org>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>, "Jin, Wen" <wen.jin@...el.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] PCI/RCEC: Fix failure to inject errors to some RCiEP
 devices

> ...
> 
> I took your suggestion and came up with the following:
> 
>   Function rcec_assoc_rciep() incorrectly used "rciep->devfn" (a single
>   byte encoding the device and function number) as the device number to
>   check whether the corresponding bit was set in the RCiEPBitmap of the
>   RCEC (Root Complex Event Collector) while enumerating over each bit of
>   the RCiEPBitmap.
> 
>   As per the PCI Express Base Specification, Revision 5.0, Version 1.0,
>   Section 7.9.10.2, "Association Bitmap for RCiEPs", p. 935, only needs to
>   use a device number to check whether the corresponding bit was set in
>   the RCiEPBitmap.
> 
>   Fix rcec_assoc_rciep() using the PCI_SLOT() macro and convert the value
>   of "rciep->devfn" to a device number to ensure that the RCiEP devices
>   are associated with the RCEC are linked when the RCEC is enumerated.
>
> Using either of the following as the subject:
> 
>   PCI/RCEC: Use device number to check RCiEPBitmap of RCEC
>   PCI/RCEC: Fix RCiEP capable devices RCEC association
> 
> What do you think?  Also, feel free to change whatever you see fit, of course, as
> tis is only a suggestion.
> 

Hi Krzysztof,

Thanks for improving the commit message. It looks clearer. 😊
Will send out a v2 with this commit message.

Thanks!
-Qiuxu