linux-kernel - [PATCH 4.14 187/217] ibmvnic: Fix error recovery on login failure

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Message-Id: <20180823075514.042492547@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:55:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, John Allen <jallen@...ux.vnet.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 187/217] ibmvnic: Fix error recovery on login failure

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: John Allen <jallen@...ux.ibm.com>

[ Upstream commit 3578a7ecb69920efc3885dbd610e98c00dbdf5db ]

Testing has uncovered a failure case that is not handled properly. In the
event that a login fails and we are not able to recover on the spot, we
return 0 from do_reset, preventing any error recovery code from being
triggered.  Additionally, the state is set to "probed" meaning that when we
are able to trigger the error recovery, the driver always comes up in the
probed state. To handle the case properly, we need to return a failure code
here and set the adapter state to the state that we entered the reset in
indicating the state that we would like to come out of the recovery reset
in.

Signed-off-by: John Allen <jallen@...ux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -1463,8 +1463,8 @@ static int do_reset(struct ibmvnic_adapt

 		rc = ibmvnic_login(netdev);
 		if (rc) {
-			adapter->state = VNIC_PROBED;
-			return 0;
+			adapter->state = reset_state;
+			return rc;
 		}

 		rc = reset_tx_pools(adapter);