linux-kernel - RE: [PATCH 086/117] Staging: hv: storvsc: Leverage the spinlock to manage ref

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Message-ID: <6E21E5352C11B742B20C142EB499E048081B239E@TK5EX14MBXC126.redmond.corp.microsoft.com>
Date:	Wed, 24 Aug 2011 00:58:36 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Greg KH <greg@...ah.com>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH 086/117] Staging: hv: storvsc: Leverage the spinlock to
 manage ref_cnt



> -----Original Message-----
> From: Greg KH [mailto:greg@...ah.com]
> Sent: Tuesday, August 23, 2011 7:10 PM
> To: KY Srinivasan
> Cc: gregkh@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; virtualization@...ts.osdl.org; Haiyang Zhang
> Subject: Re: [PATCH 086/117] Staging: hv: storvsc: Leverage the spinlock to
> manage ref_cnt
> 
> On Fri, Jul 15, 2011 at 10:47:14AM -0700, K. Y. Srinivasan wrote:
> > Now that we have a spin lock protecting access to the stor device pointer,
> > use it manage the reference count as well.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
> > ---
> >  drivers/staging/hv/hyperv_storage.h |    8 ++++----
> >  drivers/staging/hv/storvsc.c        |   10 +++++-----
> >  2 files changed, 9 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/staging/hv/hyperv_storage.h
> b/drivers/staging/hv/hyperv_storage.h
> > index 53b65be..d946211 100644
> > --- a/drivers/staging/hv/hyperv_storage.h
> > +++ b/drivers/staging/hv/hyperv_storage.h
> > @@ -265,7 +265,7 @@ struct storvsc_device {
> >  	struct hv_device *device;
> >
> >  	/* 0 indicates the device is being destroyed */
> > -	atomic_t ref_count;
> > +	int	 ref_count;
> 
> Is this really needed?  Can't you rely on the reference count of the
> hv_device itself?

We don't have a reference count on the hv_device and this count is taken
to deal with racing unloads and incoming traffic on the channel from the 
host. 

Regards,

K. Y

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