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Date: Mon, 18 Sep 2017 16:00:24 +0200
From: Greg KH <gregkh@linuxfoundation.org>
To: kys@microsoft.com
Cc: linux-kernel@vger.kernel.org, devel@linuxdriverproject.org,
        olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com,
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        marcelo.cerri@canonical.com, sthemmin@microsoft.com,
        Haiyang Zhang <haiyangz@microsoft.com>
Subject: Re: [PATCH V2 1/4] vmbus: don't acquire the mutex in
 vmbus_hvsock_device_unregister()
Message-ID: <20170918140024.GE21077@kroah.com>
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 <20170918035419.11062-1-kys@exchange.microsoft.com>
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On Sun, Sep 17, 2017 at 08:54:16PM -0700, kys@exchange.microsoft.com wrote:
> From: Dexuan Cui <decui@microsoft.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@microsoft.com>
> Cc: K. Y. Srinivasan <kys@microsoft.com>
> Cc: Haiyang Zhang <haiyangz@microsoft.com>
> Cc: Stephen Hemminger <sthemmin@microsoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@microsoft.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.

thanks,

greg k-h