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Date: Wed, 22 Sep 2021 23:38:35 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>, "David S . Miller" <davem@...emloft.net>, Sasha Levin <sashal@...nel.org>, mpe@...erman.id.au, drt@...ux.ibm.com, kuba@...nel.org, linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 5.4 01/19] ibmvnic: check failover_pending in login response From: Sukadev Bhattiprolu <sukadev@...ux.ibm.com> [ Upstream commit d437f5aa23aa2b7bd07cd44b839d7546cc17166f ] If a failover occurs before a login response is received, the login response buffer maybe undefined. Check that there was no failover before accessing the login response buffer. 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 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index ecfe588f330e..cfe7229593ea 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -4277,6 +4277,14 @@ static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq, return 0; } + if (adapter->failover_pending) { + adapter->init_done_rc = -EAGAIN; + netdev_dbg(netdev, "Failover pending, ignoring login response\n"); + complete(&adapter->init_done); + /* login response buffer will be released on reset */ + return 0; + } + netdev->mtu = adapter->req_mtu - ETH_HLEN; netdev_dbg(adapter->netdev, "Login Response Buffer:\n"); -- 2.30.2
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