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

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Message-ID: <1FB5E1D5CA062146B38059374562DF7266B8C7C4@TK5EX14MBXC128.redmond.corp.microsoft.com>
Date:	Wed, 26 May 2010 22:52:36 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	Greg KH <gregkh@...e.de>
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)

> 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.  hv_channle_ready will still be a global variable. And, the wakeup call -- osd_WaitEventSet() --remains in VmbusChannelProcessOffer() ?

Thanks,

- Haiyang

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