[PATCH 5.15 062/230] ibmvnic: init init_done_rc earlier

Greg Kroah-Hartman
2022-07-11T09:46:29Z

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

[ Upstream commit ae16bf15374d8b055e040ac6f3f1147ab1c9bb7d ]

We currently initialize the ->init_done completion/return code fields
before issuing a CRQ_INIT command. But if we get a transport event soon
after registering the CRQ the taskslet may already have recorded the
completion and error code. If we initialize here, we might overwrite/
lose that and end up issuing the CRQ_INIT only to timeout later.

If that timeout happens during probe, we will leave the adapter in the
DOWN state rather than retrying to register/init the CRQ.

Initialize the completion before registering the CRQ so we don't lose
the notification.

Fixes: 032c5e82847a ("Driver for IBM System i/p VNIC protocol")
Signed-off-by: Sukadev Bhattiprolu <sukadev@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 | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index b262aa84b6a2..70267bd73429 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2063,6 +2063,19 @@ static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
return "UNKNOWN";
}

+/*
+ * Initialize the init_done completion and return code values. We
+ * can get a transport event just after registering the CRQ and the
+ * tasklet will use this to communicate the transport event. To ensure
+ * we don't miss the notification/error, initialize these _before_
+ * regisering the CRQ.
+ */
+static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
+{
+ reinit_completion(&adapter->init_done);
+ adapter->init_done_rc = 0;
+}
+
/*
* do_reset returns zero if we are able to keep processing reset events, or
* non-zero if we hit a fatal error and must halt.
@@ -2169,6 +2182,8 @@ static int do_reset(struct ibmvnic_adapter *adapter,
*/
adapter->state = VNIC_PROBED;

+ reinit_init_done(adapter);
+
if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
rc = init_crq_queue(adapter);
} else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
@@ -2314,7 +2329,8 @@ static int do_hard_reset(struct ibmvnic_adapter *adapter,
*/
adapter->state = VNIC_PROBED;

- reinit_completion(&adapter->init_done);
+ reinit_init_done(adapter);
+
rc = init_crq_queue(adapter);
if (rc) {
netdev_err(adapter->netdev,
@@ -5485,10 +5501,6 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)

adapter->from_passive_init = false;

- if (reset)
- reinit_completion(&adapter->init_done);
-
- adapter->init_done_rc = 0;
rc = ibmvnic_send_crq_init(adapter);
if (rc) {
dev_err(dev, "Send crq init failed with error %d\n", rc);
@@ -5502,12 +5514,14 @@ static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)

if (adapter->init_done_rc) {
release_crq_queue(adapter);
+ dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc);
return adapter->init_done_rc;
}

if (adapter->from_passive_init) {
adapter->state = VNIC_OPEN;
adapter->from_passive_init = false;
+ dev_err(dev, "CRQ-init failed, passive-init\n");
return -1;
}

@@ -5596,6 +5610,8 @@ static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)

init_success = false;
do {
+ reinit_init_done(adapter);
+
rc = init_crq_queue(adapter);
if (rc) {
dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
--
2.35.1