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

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

[kys]

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(-)

diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index a7513a8a8e37..d6106e1a0d4a 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -353,6 +353,9 @@ static void process_ib_ipinfo(void *in_msg, void *out_msg, int op)
 
 		out->body.kvp_ip_val.dhcp_enabled = in->kvp_ip_val.dhcp_enabled;
 
+		/* fallthrough */
+
+	case KVP_OP_GET_IP_INFO:
 		utf16s_to_utf8s((wchar_t *)in->kvp_ip_val.adapter_id,
 				MAX_ADAPTER_ID_SIZE,
 				UTF16_LITTLE_ENDIAN,
@@ -405,7 +408,11 @@ kvp_send_key(struct work_struct *dummy)
 		process_ib_ipinfo(in_msg, message, KVP_OP_SET_IP_INFO);
 		break;
 	case KVP_OP_GET_IP_INFO:
-		/* We only need to pass on message->kvp_hdr.operation.  */
+		/*
+		 * We only need to pass on the info of operation, adapter_id
+		 * and addr_family to the userland kvp daemon.
+		 */
+		process_ib_ipinfo(in_msg, message, KVP_OP_GET_IP_INFO);
 		break;
 	case KVP_OP_SET:
 		switch (in_msg->body.kvp_set.data.value_type) {
@@ -446,9 +453,9 @@ kvp_send_key(struct work_struct *dummy)
 
 		}
 
-		break;
-
-	case KVP_OP_GET:
+		/*
+		 * The key is always a string - utf16 encoding.
+		 */
 		message->body.kvp_set.data.key_size =
 			utf16s_to_utf8s(
 			(wchar_t *)in_msg->body.kvp_set.data.key,
@@ -456,6 +463,17 @@ kvp_send_key(struct work_struct *dummy)
 			UTF16_LITTLE_ENDIAN,
 			message->body.kvp_set.data.key,
 			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
+
+		break;
+
+	case KVP_OP_GET:
+		message->body.kvp_get.data.key_size =
+			utf16s_to_utf8s(
+			(wchar_t *)in_msg->body.kvp_get.data.key,
+			in_msg->body.kvp_get.data.key_size,
+			UTF16_LITTLE_ENDIAN,
+			message->body.kvp_get.data.key,
+			HV_KVP_EXCHANGE_MAX_KEY_SIZE - 1) + 1;
 		break;
 
 	case KVP_OP_DELETE:
-- 
2.18.0

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

[Michael Kelley]

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>

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

[gregkh]

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

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

[Dexuan Cui]

> 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.

Thanks,
-- Dexuan

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

[gregkh]

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

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

[Dexuan Cui]

> 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

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

[gregkh]

On Sun, Nov 11, 2018 at 04:18:03AM +0000, Dexuan Cui wrote:
> > 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?

It's in my queue, sorry, it's big right now due to travel...

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

[KY Srinivasan]

> -----Original Message-----
> From: gregkh@linuxfoundation.org <gregkh@linuxfoundation.org>
> Sent: Thursday, November 1, 2018 11:57 AM
> 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 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?

Greg,

I have already signed-off on this patch.

K. Y
> 
> Nope, I'm not the hv maintainer, they need to look at this and ack it,
> not me :)
> 
> greg k-h

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

[Haiyang Zhang]

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

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

Thanks!