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Date:	Thu, 30 May 2013 10:20:45 +0900
From:	"Shimoda, Yoshihiro" <>
Cc:	Alexey Khoroshilov <>,
	Greg Kroah-Hartman <>,,,
Subject: Re: [PATCH] usb: gadget: r8a66597-udc: do not unlock unheld spinlock
 in r8a66597_sudmac_irq()


(2013/05/30 8:58), Felipe Balbi wrote:
> HI,
> On Thu, May 30, 2013 at 12:51:37AM +0400, Alexey Khoroshilov wrote:
>> r8a66597_irq() processes sudmac part (r8a66597_sudmac_irq()) before locking r8a66597->lock.
>> But transfer_complete(), that is called inside (r8a66597_sudmac_irq()->sudmac_finish()->transfer_complete()),
>> expects r8a66597->lock is locked. As a result unheld spinlock can be unlocked.
>> The patch just moves locking before calling r8a66597_sudmac_irq().
>> Found by Linux Driver Verification project (
>> Signed-off-by: Alexey Khoroshilov <>
> should this go to stable ? Looks like this bug has been there since
> 2.6.32.

Because non SMP CPUs have sudmac for now, this may not go to stable, I think.

Best regards,
Yoshihiro Shimoda
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