linux-kernel - Re: [PATCH v2] PCI: mediatek: Clear interrupt status before dispatching handler

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Message-ID: <YgS10ZUCzgjRs6LQ@kroah.com>
Date:   Thu, 10 Feb 2022 07:50:57 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     qizhong cheng <qizhong.cheng@...iatek.com>
Cc:     Ryder Lee <ryder.lee@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org,
        chuanjia.liu@...iatek.com
Subject: Re: [PATCH v2] PCI: mediatek: Clear interrupt status before
 dispatching handler

On Thu, Feb 10, 2022 at 09:21:25AM +0800, qizhong cheng wrote:
> We found a failure when used iperf tool for wifi performance testing,
> there are some MSIs received while clearing the interrupt status,
> these MSIs cannot be serviced.
> 
> The interrupt status can be cleared even the MSI status still remaining,
> as an edge-triggered interrupts, its interrupt status should be cleared
> before dispatching to the handler of device.
> 
> Signed-off-by: qizhong cheng <qizhong.cheng@...iatek.com>
> ---
> v2:
>  - Update the subject line.
>  - Improve the commit log and code comments.
> 
>  drivers/pci/controller/pcie-mediatek.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>