linux-kernel - [PATCH 5.15 218/262] ibmvnic: initialize rc before completing wait

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Date:   Mon,  7 Mar 2022 10:19:22 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sukadev Bhattiprolu <sukadev@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 218/262] ibmvnic: initialize rc before completing wait

From: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>

[ Upstream commit 765559b10ce514eb1576595834f23cdc92125fee ]

We should initialize ->init_done_rc before calling complete(). Otherwise
the waiting thread may see ->init_done_rc as 0 before we have updated it
and may assume that the CRQ was successful.

Fixes: 6b278c0cb378 ("ibmvnic delay complete()")
Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 52eb6629328c..e98f7d3f935d 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -5145,9 +5145,9 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
 			}
 
 			if (!completion_done(&adapter->init_done)) {
-				complete(&adapter->init_done);
 				if (!adapter->init_done_rc)
 					adapter->init_done_rc = -EAGAIN;
+				complete(&adapter->init_done);
 			}
 
 			break;
-- 
2.34.1