linux-kernel - Re: [PATCH 4/5 V4] PCI: only return true when dev io state is really changed

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Date:   Sun, 27 Sep 2020 02:14:25 -0700
From:   Joe Perches <joe@...ches.com>
To:     Ethan Zhao <haifeng.zhao@...el.com>, bhelgaas@...gle.com,
        oohall@...il.com, ruscur@...sell.cc, lukas@...ner.de,
        andriy.shevchenko@...ux.intel.com, stuart.w.hayes@...il.com,
        mr.nuke.me@...il.com, mika.westerberg@...ux.intel.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        pei.p.jia@...el.com, ashok.raj@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...el.com, hch@...radead.org
Subject: Re: [PATCH 4/5 V4] PCI: only return true when dev io state is
 really changed

On Sun, 2020-09-27 at 04:27 -0400, Ethan Zhao wrote:
> When uncorrectable error happens, AER driver and DPC driver interrupt
> handlers likely call
> 
>    pcie_do_recovery()
>    ->pci_walk_bus()
>      ->report_frozen_detected()
> 
> with pci_channel_io_frozen the same time.
>    If pci_dev_set_io_state() return true even if the original state is
> pci_channel_io_frozen, that will cause AER or DPC handler re-enter
> the error detecting and recovery procedure one after another.
>    The result is the recovery flow mixed between AER and DPC.
> So simplify the pci_dev_set_io_state() function to only return true
> when dev->error_state is changed.
> 
> Signed-off-by: Ethan Zhao <haifeng.zhao@...el.com>
> Tested-by: Wen Jin <wen.jin@...el.com>
> Tested-by: Shanshan Zhang <ShanshanX.Zhang@...el.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Reviewed-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> Reviewed-by: Joe Perches <joe@...ches.com>

Hi Ethan/Haifeng.

Like Andy, I did not "review" this patch and sign it.
I merely suggested another simplification.
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