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From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Macpaul Lin <macpaul.lin@mediatek.com>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
	Mediatek WSD Upstream <wsd_upstream@mediatek.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-mediatek@lists.infradead.org,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Macpaul Lin <macpaul.lin@gmail.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] usb: host: xhci-mtk: avoid runtime suspend when removing hcd
Date: Wed, 3 Jun 2020 16:43:26 +0800	[thread overview]
Message-ID: <1591173806.15527.1.camel@mhfsdcap03> (raw)
In-Reply-To: <1590726778-29065-1-git-send-email-macpaul.lin@mediatek.com>

On Fri, 2020-05-29 at 12:32 +0800, Macpaul Lin wrote:
> When runtime suspend was enabled, runtime suspend might happened
> 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@mediatek.com>
> ---
>  drivers/usb/host/xhci-mtk.c |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> index bfbdb3c..641d24e 100644
> --- a/drivers/usb/host/xhci-mtk.c
> +++ b/drivers/usb/host/xhci-mtk.c
> @@ -587,6 +587,9 @@ static int xhci_mtk_remove(struct platform_device *dev)
>  	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
>  	struct usb_hcd  *shared_hcd = xhci->shared_hcd;
>  
> +	pm_runtime_put_sync(&dev->dev);
> +	pm_runtime_disable(&dev->dev);
> +
>  	usb_remove_hcd(shared_hcd);
>  	xhci->shared_hcd = NULL;
>  	device_init_wakeup(&dev->dev, false);
> @@ -597,8 +600,6 @@ static int xhci_mtk_remove(struct platform_device *dev)
>  	xhci_mtk_sch_exit(mtk);
>  	xhci_mtk_clks_disable(mtk);
>  	xhci_mtk_ldos_disable(mtk);
> -	pm_runtime_put_sync(&dev->dev);
> -	pm_runtime_disable(&dev->dev);
>  
>  	return 0;
>  }

Reviewed-by: Chunfeng Yun <chunfeng.yun@mediatek.com>

Thanks


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  reply	other threads:[~2020-06-03  8:53 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-29  4:29 [PATCH] usb: host: xhci-mtk: avoid runtime suspend when removing hcd Macpaul Lin
2020-05-29  4:32 ` [PATCH v2] " Macpaul Lin
2020-06-03  8:43   ` Chunfeng Yun [this message]
2020-06-03 11:47 ` [PATCH] " Mathias Nyman
2020-06-03 13:01   ` Macpaul Lin
2020-06-03 13:09   ` [PATCH v3] " Macpaul Lin
2020-06-03 17:33     ` Sergei Shtylyov
2020-06-04  3:01     ` [PATCH v4] " Macpaul Lin
2020-06-04  9:14       ` Mathias Nyman

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