refine xhci-plat-Fix-xhci_plat-shutdown-sequence

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Apr 17, 2018 at 11:32:42AM +0800, leiwan@codeaurora.org wrote:
> 
> xhci-plat Shutdown callback should check HCD_FLAG_HW_ACCESSIBLE
> before accessing any register. This should avoid hung with access
> controllers which support runtime suspend
> 
> This can fix for issue of https://patchwork.kernel.org/patch/10339317/
> corresponding upload in CAF:
> https://source.codeaurora.org/quic/la/kernel/msm-4.4/commit/?h=LV.HB.1.1.5-03810-8x96.0&id=a7a5307ee04ad349d365ad50f304605a9cd9bd0a
> 
> full patch refer attachment.
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 9b27798..bdf914d 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -702,6 +702,10 @@ static void xhci_shutdown(struct usb_hcd *hcd)
>                 usb_disable_xhci_ports(to_pci_dev(hcd->self.sysdev));
> 
>         spin_lock_irq(&xhci->lock);
> +       if (!HCD_HW_ACCESSIBLE(hcd)) {
> +               spin_unlock_irq(&xhci->lock);
> +               return;
> +       }
>         xhci_halt(xhci);
>         /* Workaround for spurious wakeups at shutdown with HSW */
>         if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)

> From 9b65acb64f1ad87d115fa147c9e947fb3d37471c Mon Sep 17 00:00:00 2001
> From: Lei wang <leiwan@codeaurora.org>
> Date: Tue, 17 Apr 2018 10:55:35 +0800
> Subject: [PATCH] xhci: plat: Fix xhci_plat shutdown hung
> 
> xhci-plat Shutdown callback should check HCD_FLAG_HW_ACCESSIBLE
> before accessing any register. This should avoid hung with access
> controllers which support runtime suspend
> 
> Signed-off-by: Lei wang <leiwan@codeaurora.org>
> ---
>  drivers/usb/host/xhci.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> index 9b27798..bdf914d 100644
> --- a/drivers/usb/host/xhci.c
> +++ b/drivers/usb/host/xhci.c
> @@ -702,6 +702,10 @@ static void xhci_shutdown(struct usb_hcd *hcd)
>  		usb_disable_xhci_ports(to_pci_dev(hcd->self.sysdev));
>  
>  	spin_lock_irq(&xhci->lock);
> +	if (!HCD_HW_ACCESSIBLE(hcd)) {
> +		spin_unlock_irq(&xhci->lock);
> +		return;
> +	}
>  	xhci_halt(xhci);
>  	/* Workaround for spurious wakeups at shutdown with HSW */
>  	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
> -- 
> 1.9.1
> 

Hi,

This is the friendly patch-bot of Greg Kroah-Hartman.  You have sent him
a patch that has triggered this response.  He used to manually respond
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