linux-kernel - RE: [PATCH V2 1/4] vmbus: don't acquire the mutex in vmbus_hvsock_device

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Date:   Mon, 18 Sep 2017 14:43:51 +0000
From:   KY Srinivasan <kys@...rosoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "apw@...onical.com" <apw@...onical.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "leann.ogasawara@...onical.com" <leann.ogasawara@...onical.com>,
        "marcelo.cerri@...onical.com" <marcelo.cerri@...onical.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH V2 1/4] vmbus: don't acquire the mutex in
 vmbus_hvsock_device_unregister()



> -----Original Message-----
> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Monday, September 18, 2017 7:00 AM
> To: KY Srinivasan <kys@...rosoft.com>
> Cc: linux-kernel@...r.kernel.org; devel@...uxdriverproject.org;
> olaf@...fle.de; apw@...onical.com; vkuznets@...hat.com;
> jasowang@...hat.com; leann.ogasawara@...onical.com;
> marcelo.cerri@...onical.com; Stephen Hemminger
> <sthemmin@...rosoft.com>; Haiyang Zhang <haiyangz@...rosoft.com>
> Subject: Re: [PATCH V2 1/4] vmbus: don't acquire the mutex in
> vmbus_hvsock_device_unregister()
> 
> On Sun, Sep 17, 2017 at 08:54:16PM -0700, kys@...hange.microsoft.com
> wrote:
> > From: Dexuan Cui <decui@...rosoft.com>
> >
> > Due to commit 54a66265d675 ("Drivers: hv: vmbus: Fix rescind handling"),
> > we need this patch to resolve the below deadlock:
> >
> > after we get the mutex in vmbus_hvsock_device_unregister() and call
> > vmbus_device_unregister() -> device_unregister() -> ... ->
> device_release()
> > -> vmbus_device_release(), we'll get a deadlock, because
> > vmbus_device_release() tries to get the same mutex.
> >
> > Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> > Cc: K. Y. Srinivasan <kys@...rosoft.com>
> > Cc: Haiyang Zhang <haiyangz@...rosoft.com>
> > Cc: Stephen Hemminger <sthemmin@...rosoft.com>
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> 
> As every one of these patches had questions from me, please break them
> up into different series, one for 4.14-final, and one for 4.15-rc1.

Will do.

Thanks,

K. Y
> 
> thanks,
> 
> greg k-h