linux-kernel - Re: [PATCH v4] usb: host: xhci-mtk: avoid runtime suspend when removing hcd

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Message-ID: <d65bf50c-b1de-ece4-f14d-8f54418108ad@linux.intel.com>
Date:   Thu, 4 Jun 2020 12:14:38 +0300
From:   Mathias Nyman <mathias.nyman@...ux.intel.com>
To:     Macpaul Lin <macpaul.lin@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul.lin@...il.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-usb@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v4] usb: host: xhci-mtk: avoid runtime suspend when
 removing hcd

On 4.6.2020 6.01, Macpaul Lin wrote:
> When runtime suspend was enabled, runtime suspend might happen
> when xhci is removing hcd. This might cause kernel panic when hcd
> has been freed but runtime pm suspend related handle need to
> reference it.
> 
> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
> Reviewed-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> Cc: stable@...r.kernel.org
> ---
> Changes for v3:
>   - Replace better sequence for disabling the pm_runtime suspend.
> Changes for v4:
>   - Thanks for Sergei's review, typo in commit description has been corrected.
> 

Thanks, added to queue

-Mathias