linux-kernel - Re: [PATCH RESEND] usb: ohci-exynos: Remove locks for 'ohci' in suspend callback

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Date:	Wed, 09 Apr 2014 11:13:32 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	'Vivek Gautam' <gautam.vivek@...sung.com>,
	'Alan Stern' <stern@...land.harvard.edu>
Cc:	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, kgene.kim@...sung.com,
	'Manjunath Goudar' <csmanjuvijay@...il.com>,
	'Jingoo Han' <jg1.han@...sung.com>
Subject: Re: [PATCH RESEND] usb: ohci-exynos: Remove locks for 'ohci' in
 suspend callback

On Tuesday, April 08, 2014 11:41 PM, Vivek Gautam wrote:
> 
> Patch : 14982e3 USB: OHCI: Properly handle ohci-exynos suspend
> has already removed 'ohci_hcd' settings from exynos glue layer
> as a part of streamlining the ohci controller's suspend.
> So we don't need the locks for 'ohci_hcd' anymore.

Right, this spin_lock/unlock is unnecessary, because it is
already used in ohci_suspend().

Acked-by: Jingoo Han <jg1.han@...sung.com>

Best regards,
Jingoo Han

> 
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> Cc: Manjunath Goudar <csmanjuvijay@...il.com>
> Cc: Alan Stern <stern@...land.harvard.edu>
> ---
>  drivers/usb/host/ohci-exynos.c |    6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
> index 68588d8..9cf80cb 100644
> --- a/drivers/usb/host/ohci-exynos.c
> +++ b/drivers/usb/host/ohci-exynos.c
> @@ -190,17 +190,13 @@ static int exynos_ohci_suspend(struct device *dev)
>  {
>  	struct usb_hcd *hcd = dev_get_drvdata(dev);
>  	struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
> -	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
>  	struct platform_device *pdev = to_platform_device(dev);
>  	bool do_wakeup = device_may_wakeup(dev);
> -	unsigned long flags;
>  	int rc = ohci_suspend(hcd, do_wakeup);
> 
>  	if (rc)
>  		return rc;
> 
> -	spin_lock_irqsave(&ohci->lock, flags);
> -
>  	if (exynos_ohci->otg)
>  		exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
> 
> @@ -208,8 +204,6 @@ static int exynos_ohci_suspend(struct device *dev)
> 
>  	clk_disable_unprepare(exynos_ohci->clk);
> 
> -	spin_unlock_irqrestore(&ohci->lock, flags);
> -
>  	return 0;
>  }
> 
> --
> 1.7.10.4

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