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

Haiyang Zhang haiyangz at microsoft.com
Thu Nov 1 19:38:38 UTC 2018

> -----Original Message-----
> From: kys at linuxonhyperv.com <kys at linuxonhyperv.com>
> Sent: Thursday, October 18, 2018 1:10 AM
> To: gregkh at linuxfoundation.org; linux-kernel at vger.kernel.org;
> devel at linuxdriverproject.org; olaf at aepfle.de; apw at canonical.com;
> jasowang at redhat.com; Stephen Hemminger <sthemmin at microsoft.com>;
> Michael Kelley <mikelley at microsoft.com>; vkuznets <vkuznets at redhat.com>
> Cc: Dexuan Cui <decui at microsoft.com>; KY Srinivasan <kys at microsoft.com>;
> Haiyang Zhang <haiyangz at microsoft.com>; Stable at vger.kernel.org
> Subject: [PATCH V2 3/5] Drivers: hv: kvp: Fix the recent regression caused by
> incorrect clean-up
> From: Dexuan Cui <decui at 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 at microsoft.com>
> Cc: K. Y. Srinivasan <kys at microsoft.com>
> Cc: Haiyang Zhang <haiyangz at microsoft.com>
> Cc: Stephen Hemminger <sthemmin at microsoft.com>
> Cc: <Stable at vger.kernel.org>
> Signed-off-by: K. Y. Srinivasan <kys at microsoft.com>

Signed-off-by: Haiyang Zhang <haiyangz at microsoft.com>


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