linux-kernel - [PATCH 4/8] Drivers: hv: vmbus: Fix the offer_in_progress in vmbus_process

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Message-Id: <20180605203756.29809-4-kys@linuxonhyperv.com>
Date:   Tue,  5 Jun 2018 13:37:52 -0700
From:   kys@...uxonhyperv.com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
        jasowang@...hat.com, sthemmin@...rosoft.com,
        Michael.H.Kelley@...rosoft.com, vkuznets@...hat.com
Cc:     Dexuan Cui <decui@...rosoft.com>, stable@...r.kernel.org,
        "K . Y . Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 4/8] Drivers: hv: vmbus: Fix the offer_in_progress in vmbus_process_offer()

From: Dexuan Cui <decui@...rosoft.com>

I didn't really hit a real bug, but just happened to spot the bug:
we have decreased the counter at the beginning of vmbus_process_offer(),
so we mustn't decrease it again.

Fixes: 6f3d791f3006 ("Drivers: hv: vmbus: Fix rescind handling issues")
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
Cc: stable@...r.kernel.org
Cc: Stephen Hemminger <sthemmin@...rosoft.com>
Cc: K. Y. Srinivasan <kys@...rosoft.com>
Cc: Stable <stable@...r.kernel.org> # 4.14 and above
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/channel_mgmt.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index ecc2bd275a73..f3b551a50653 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -527,10 +527,8 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
 		struct hv_device *dev
 			= newchannel->primary_channel->device_obj;
 
-		if (vmbus_add_channel_kobj(dev, newchannel)) {
-			atomic_dec(&vmbus_connection.offer_in_progress);
+		if (vmbus_add_channel_kobj(dev, newchannel))
 			goto err_free_chan;
-		}
 
 		if (channel->sc_creation_callback != NULL)
 			channel->sc_creation_callback(newchannel);
-- 
2.17.1