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

Dexuan Cui
2018-11-11T04:18:03Z

> From: gregkh@linuxfoundation.org <gregkh@linuxfoundation.org>
> Sent: Thursday, November 1, 2018 21:54
> To: Dexuan Cui <decui@microsoft.com>
> Cc: Michael Kelley <mikelley@microsoft.com>; KY Srinivasan
> <kys@microsoft.com>; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> jasowang@redhat.com; Stephen Hemminger <sthemmin@microsoft.com>;
> vkuznets <vkuznets@redhat.com>; Sasha Levin
> <Alexander.Levin@microsoft.com>; Haiyang Zhang <haiyangz@microsoft.com>;
> Stable@vger.kernel.org
> Subject: Re: [PATCH V2 3/5] Drivers: hv: kvp: Fix the recent regression caused
> by incorrect clean-up
>
> On Thu, Nov 01, 2018 at 07:22:28PM +0000, Dexuan Cui wrote:
> > > From: gregkh@linuxfoundation.org <gregkh@linuxfoundation.org>
> > > Sent: Thursday, November 1, 2018 11:57
> > > To: Dexuan Cui <decui@microsoft.com>
> > >
> > > On Wed, Oct 31, 2018 at 11:23:54PM +0000, Dexuan Cui wrote:
> > > > > From: Michael Kelley <mikelley@microsoft.com>
> > > > > Sent: Wednesday, October 24, 2018 08:38
> > > > > From: kys@linuxonhyperv.com <kys@linuxonhyperv.com> Sent:
> > > Wednesday,
> > > > > October 17, 2018 10:10 PM
> > > > > > From: Dexuan Cui <decui@microsoft.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@microsoft.com>
> > > > > > Cc: K. Y. Srinivasan <kys@microsoft.com>
> > > > > > Cc: Haiyang Zhang <haiyangz@microsoft.com>
> > > > > > Cc: Stephen Hemminger <sthemmin@microsoft.com>
> > > > > > Cc: <Stable@vger.kernel.org>
> > > > > > Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> > > > > > ---
> > > > > > drivers/hv/hv_kvp.c | 26 ++++++++++++++++++++++----
> > > > > > 1 file changed, 22 insertions(+), 4 deletions(-)
> > > > > >
> > > > > Reviewed-by: Michael Kelley <mikelley@microsoft.com>
> > > >
> > > > Hi Greg,
> > > > Can you please take a look at this patch?
> > >
> > > Nope, I'm not the hv maintainer, they need to look at this and ack it,
> > > not me :)
> > >
> > > greg k-h
> >
> > Hi Greg,
> > KY has added his Signed-off-by in the mail.
> >
> > I'll ask the other HV maintainers to take a look as well.
>
> Ok, then I'll look at it after 4.20-rc1 is out, nothing I can do until
> then anyway...
>
> thanks,
>
> greg k-h

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

The patch has received

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>

Thanks,
-- Dexuan