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Re: [PATCH v2] netpoll: Fix extra refcount release in netpoll_cleanup()

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: [PATCH v2] netpoll: Fix extra refcount release in netpoll_cleanup()
Date 2016-03-25 20:20 +0100
Message-ID <rgFr4-6pQ-5@gated-at.bofh.it> (permalink)
References <rgq8F-3rj-1@gated-at.bofh.it> <rgyfU-ZW-3@gated-at.bofh.it> <rgD5U-4yf-9@gated-at.bofh.it>
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From: Bjorn Helgaas <helgaas@kernel.org>
Date: Fri, 25 Mar 2016 11:46:39 -0500

> You're right, there is an issue here.  I reproduced a problem with a
> bond device.  bond_netpoll_setup() calls __netpoll_setup() directly
> (not netpoll_setup()).  I'll debug it more; just wanted to let you
> know there *is* a problem with this patch.

I bet that's why the assignment to np->dev and the reference counting
were separated in the first place :-/

Indeed, commit 30fdd8a082a00126a6feec994e43e8dc12f5bccb:

commit 30fdd8a082a00126a6feec994e43e8dc12f5bccb
Author: Jiri Pirko <jiri@resnulli.us>
Date:   Tue Jul 17 05:22:35 2012 +0000

    netpoll: move np->dev and np->dev_name init into __netpoll_setup()
    
    Signed-off-by: Jiri Pirko <jiri@resnulli.us>
    Signed-off-by: David S. Miller <davem@davemloft.net>

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Thread

[PATCH v2] netpoll: Fix extra refcount release in netpoll_cleanup() Bjorn Helgaas <bhelgaas@google.com> - 2016-03-25 04:00 +0100
  Re: [PATCH v2] netpoll: Fix extra refcount release in  netpoll_cleanup() Neil Horman <nhorman@redhat.com> - 2016-03-25 12:40 +0100
    Re: [PATCH v2] netpoll: Fix extra refcount release in  netpoll_cleanup() Bjorn Helgaas <helgaas@kernel.org> - 2016-03-25 17:50 +0100
      Re: [PATCH v2] netpoll: Fix extra refcount release in  netpoll_cleanup() David Miller <davem@davemloft.net> - 2016-03-25 20:20 +0100
        Re: [PATCH v2] netpoll: Fix extra refcount release in  netpoll_cleanup() Neil Horman <nhorman@redhat.com> - 2016-03-28 15:20 +0200
  Re: [PATCH v2] netpoll: Fix extra refcount release in  netpoll_cleanup() David Miller <davem@davemloft.net> - 2016-03-25 16:30 +0100

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