linux-kernel - Re: [PATCH 1/1] staging: hv: Fix race condition on IC channel initialization (modified)

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Date:	Thu, 27 May 2010 16:22:32 -0700
From:	Greg KH <gregkh@...e.de>
To:	Haiyang Zhang <haiyangz@...rosoft.com>
Cc:	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'devel@...verdev.osuosl.org'" <devel@...verdev.osuosl.org>,
	"'virtualization@...ts.osdl.org'" <virtualization@...ts.osdl.org>,
	Hank Janssen <hjanssen@...rosoft.com>
Subject: Re: [PATCH 1/1] staging: hv: Fix race condition on IC channel
 initialization (modified)

On Wed, May 26, 2010 at 10:52:36PM +0000, Haiyang Zhang wrote:
> > From: Greg KH [mailto:gregkh@...e.de]
> > How about a lock!
> > 
> > What's so scary about a pretty little semaphore?  They are all cute and
> > cuddley and don't bite anyone.  You should not be afraid to use them,
> > they are here to do your bidding.
> 
> No problem, we will add a lock here.
> 
> > > The VmbusChannelProcessOffer() is called from interrupt context, and
> > > initialize the channels, wake up vmbus_init when all channels are
> > > ready. If using local variable only, how to pass the channel ready
> > > info to vmbus_init() which is in a different context?
> > 
> > No, I mean move the logic you added here, into the vmbus_init() call.
> 
> Do you mean:
> Move the event creat/wait/free, which is currently in vmbus_init(),
> into vmbus_bus_init() function.

Yes.

> hv_channle_ready will still be a global variable.

That's fine.

> And, the wakeup call -- osd_WaitEventSet() --remains in
> VmbusChannelProcessOffer() ?

Yes.

And as Jiri pointed out, this should be a simple completion.

thanks,

greg k-h
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