linux-kernel - Re: [PATCH 1/2] usbip: Remove repeated setting of hcd->state in vhci_bus

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Date:   Mon, 6 May 2019 09:13:02 -0600
From:   shuah <shuah@...nel.org>
To:     Suwan Kim <suwan.kim027@...il.com>, valentina.manea.m@...il.com,
        gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        shuah <shuah@...nel.org>
Subject: Re: [PATCH 1/2] usbip: Remove repeated setting of hcd->state in
 vhci_bus_suspend()

On 5/6/19 6:55 AM, Suwan Kim wrote:
> When hcd suspends execution, hcd_bus_suspend() calls vhci_bus_suspend()
> which sets hcd->state as HC_STATE_SUSPENDED. But after calling
> vhci_bus_suspend(), hcd_bus_suspend() also sets hcd->state as
> HC_STATE_SUSPENDED.
> So, setting hcd->state in vhci_hcd_suspend() is unnecessary.
> 
> Signed-off-by: Suwan Kim <suwan.kim027@...il.com>
> ---
>   drivers/usb/usbip/vhci_hcd.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
> index 667d9c0ec905..e6f378d00fb6 100644
> --- a/drivers/usb/usbip/vhci_hcd.c
> +++ b/drivers/usb/usbip/vhci_hcd.c
> @@ -1238,10 +1238,6 @@ static int vhci_bus_suspend(struct usb_hcd *hcd)
>   
>   	dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
>   
> -	spin_lock_irqsave(&vhci->lock, flags);
> -	hcd->state = HC_STATE_SUSPENDED;
> -	spin_unlock_irqrestore(&vhci->lock, flags);
> -
>   	return 0;
>   }
>   
> 

Tell me more about why you think this change is needed? How did you test
this change?

thanks,
-- Shuah