linux-kernel - RE: [PATCH V2 3/5] Drivers: hv: kvp: Fix the recent regression caused by incorrect clean-up

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Date:   Wed, 31 Oct 2018 23:23:54 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Michael Kelley <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "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>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        vkuznets <vkuznets@...hat.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
CC:     Haiyang Zhang <haiyangz@...rosoft.com>,
        "Stable@...r.kernel.org" <Stable@...r.kernel.org>
Subject: RE: [PATCH V2 3/5] Drivers: hv: kvp: Fix the recent regression caused
 by incorrect clean-up

> From: Michael Kelley <mikelley@...rosoft.com>
> Sent: Wednesday, October 24, 2018 08:38
> From: kys@...uxonhyperv.com <kys@...uxonhyperv.com>  Sent: Wednesday,
> October 17, 2018 10:10 PM
> > From: Dexuan Cui <decui@...rosoft.com>
> >
> > In kvp_send_key(), we do need call process_ib_ipinfo() if
> > message->kvp_hdr.operation is KVP_OP_GET_IP_INFO, because it turns out
> > the userland hv_kvp_daemon needs the info of operation, adapter_id and
> > addr_family. With the incorrect fc62c3b1977d, the host can't get the
> > VM's IP via KVP.
> >
> > And, fc62c3b1977d added a "break;", but actually forgot to initialize
> > the key_size/value in the case of KVP_OP_SET, so the default key_size of
> > 0 is passed to the kvp daemon, and the pool files
> > /var/lib/hyperv/.kvp_pool_* can't be updated.
> >
> > This patch effectively rolls back the previous fc62c3b1977d, and
> > correctly fixes the "this statement may fall through" warnings.
> >
> > This patch is tested on WS 2012 R2 and 2016.
> >
> > Fixes: fc62c3b1977d ("Drivers: hv: kvp: Fix two "this statement may fall
> through" warnings")
> > 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>
> > Cc: <Stable@...r.kernel.org>
> > Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> > ---
> >  drivers/hv/hv_kvp.c | 26 ++++++++++++++++++++++----
> >  1 file changed, 22 insertions(+), 4 deletions(-)
> >
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>

Hi Greg,
Can you please take a look at this patch?

We need it to fix a regression introduced by me in:
Fixes: fc62c3b1977d ("Drivers: hv: kvp: Fix two "this statement may fall through" warnings")

The faulty patch is being meged into the old stable kernels... So we need to
take this patch ASAP. Thanks!

-- Dexuan