linux-kernel - RE: [PATCH v2] usb: dwc2: call dwc2_is_controller

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Date:	Wed, 14 Jan 2015 19:03:37 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	Robert Baldyga <r.baldyga@...sung.com>,
	"balbi@...com" <balbi@...com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dinguyen@...nsource.altera.com" <dinguyen@...nsource.altera.com>,
	"yousaf.kaukab@...el.com" <yousaf.kaukab@...el.com>,
	"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>
Subject: RE: [PATCH v2] usb: dwc2: call dwc2_is_controller_alive() under
 spinlock

> From: Robert Baldyga [mailto:r.baldyga@...sung.com]
> Sent: Tuesday, January 13, 2015 10:46 PM
> 
> This patch fixes bug described here:
> https://lkml.org/lkml/2014/12/22/185
> 
> Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>

Although I don't understand *why* this fixes Robert's issue, it's
certainly a harmless patch, so

Acked-by: Paul Zimmerman <paulz@...opsys.com>

But I suspect Felipe will want a better changelog, I don't think just
a URL is good enough.

-- 
Paul

> ---
> 
> Changelog:
> 
> v2:
> - fixed comment from Paul Zimmerman
> 
> v1: https://lkml.org/lkml/2015/1/13/186
> 
>  drivers/usb/dwc2/core_intr.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
> index ad43c5b..02e3e2d 100644
> --- a/drivers/usb/dwc2/core_intr.c
> +++ b/drivers/usb/dwc2/core_intr.c
> @@ -476,13 +476,13 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
>  	u32 gintsts;
>  	irqreturn_t retval = IRQ_NONE;
> 
> +	spin_lock(&hsotg->lock);
> +
>  	if (!dwc2_is_controller_alive(hsotg)) {
>  		dev_warn(hsotg->dev, "Controller is dead\n");
>  		goto out;
>  	}
> 
> -	spin_lock(&hsotg->lock);
> -
>  	gintsts = dwc2_read_common_intr(hsotg);
>  	if (gintsts & ~GINTSTS_PRTINT)
>  		retval = IRQ_HANDLED;
> @@ -515,8 +515,8 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
>  		}
>  	}
> 
> -	spin_unlock(&hsotg->lock);
>  out:
> +	spin_unlock(&hsotg->lock);
>  	return retval;
>  }
>  EXPORT_SYMBOL_GPL(dwc2_handle_common_intr);
> --
> 1.9.1

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