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

[Haiyang Zhang]

> -----Original Message-----
> From: kys@xxxxxxxxxxxxxxxxx <kys@xxxxxxxxxxxxxxxxx>
> Sent: Thursday, October 18, 2018 1:10 AM
> To: gregkh@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> devel@xxxxxxxxxxxxxxxxxxxxxx; olaf@xxxxxxxxx; apw@xxxxxxxxxxxxx;
> jasowang@xxxxxxxxxx; Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>;
> Michael Kelley <mikelley@xxxxxxxxxxxxx>; vkuznets <vkuznets@xxxxxxxxxx>
> Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>;
> Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>; Stable@xxxxxxxxxxxxxxx
> Subject: [PATCH V2 3/5] Drivers: hv: kvp: Fix the recent regression caused by
> incorrect clean-up
> 
> From: Dexuan Cui <decui@xxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxx>
> Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
> Cc: <Stable@xxxxxxxxxxxxxxx>
> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>

Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>

Thanks!