From: Sukadev Bhattiprolu sukadev@linux.ibm.com
[ Upstream commit 6b278c0cb378079f3c0c61ae4a369c09ff1a4188 ]
If we get CRQ_INIT, we set errno to -EIO and first call complete() to notify the waiter. Then we try to schedule a FAILOVER reset. If this occurs while adapter is in PROBING state, ibmvnic_reset() changes the error code to EAGAIN and returns without scheduling the FAILOVER. The purpose of setting error code to EAGAIN is to ask the waiter to retry.
But due to the earlier complete() call, the waiter may already have seen the -EIO response and decided not to retry. This can cause intermittent failures when bringing up ibmvnic adapters during boot, specially in in kexec/kdump kernels.
Defer the complete() call until after scheduling the reset.
Also streamline the error code to EAGAIN. Don't see why we need EIO sometimes. All 3 callers of ibmvnic_reset_init() can handle EAGAIN.
Fixes: 17c8705838a5 ("ibmvnic: Return error code if init interrupted by transport event") Reported-by: Vaishnavi Bhat vaish123@in.ibm.com Signed-off-by: Sukadev Bhattiprolu sukadev@linux.ibm.com Reviewed-by: Dany Madden drt@linux.ibm.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/ibm/ibmvnic.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c index 84961a83803b7..352ffe982d849 100644 --- a/drivers/net/ethernet/ibm/ibmvnic.c +++ b/drivers/net/ethernet/ibm/ibmvnic.c @@ -2565,7 +2565,7 @@ static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
if (adapter->state == VNIC_PROBING) { netdev_warn(netdev, "Adapter reset during probe\n"); - adapter->init_done_rc = EAGAIN; + adapter->init_done_rc = -EAGAIN; ret = EAGAIN; goto err; } @@ -5067,11 +5067,6 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq, */ adapter->login_pending = false;
- if (!completion_done(&adapter->init_done)) { - complete(&adapter->init_done); - adapter->init_done_rc = -EIO; - } - if (adapter->state == VNIC_DOWN) rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT); else @@ -5092,6 +5087,13 @@ static void ibmvnic_handle_crq(union ibmvnic_crq *crq, rc); adapter->failover_pending = false; } + + if (!completion_done(&adapter->init_done)) { + complete(&adapter->init_done); + if (!adapter->init_done_rc) + adapter->init_done_rc = -EAGAIN; + } + break; case IBMVNIC_CRQ_INIT_COMPLETE: dev_info(dev, "Partner initialization complete\n"); @@ -5559,7 +5561,7 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id) }
rc = ibmvnic_reset_init(adapter, false); - } while (rc == EAGAIN); + } while (rc == -EAGAIN);
/* We are ignoring the error from ibmvnic_reset_init() assuming that the * partner is not ready. CRQ is not active. When the partner becomes