linux-kernel - Re: Linux guest domain with two vnets bound to the same vswitch experiences hung in bootup (sun

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Message-Id: <20091009.150829.218507309.davem@davemloft.net>
Date:	Fri, 09 Oct 2009 15:08:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	heyongli@...il.com
Cc:	sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Linux guest domain with two vnets bound to the same vswitch
 experiences hung in bootup (sun_netraT5220)

From: hyl <heyongli@...il.com>
Date: Thu, 24 Sep 2009 10:03:25 +0800

> Subject: [PATCH] Sun ldom vnet driver dead lock
> 
> if 2 vnet attach to same vswitch, ldom will report
> 2 same irq then lead to dead lock on the lp->lock
> or the vio->lock
> 
> static irqreturn_t ldc_rx(int irq, void *dev_id){
> ...
> out:
> 	spin_unlock_irqrestore(&lp->lock, flags);
>            << here run with out any lock
> 	send_events(lp, event_mask);
>            >> vnet evetn process will dead lock on
>            >> lp->lock or the vio->lock
> 
> Signed-off-by: Yongli He <heyongli@...il.com>

Thank you for this bug report and patch, I am looking at
it now.
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