[PATCH 6.5 052/112] iavf: initialize waitqueues before starting watchdog_task

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

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

From: Michal Schmidt <mschmidt@xxxxxxxxxx>

[ Upstream commit 7db3111043885c146e795c199d39c3f9042d97c0 ]

It is not safe to initialize the waitqueues after queueing the
watchdog_task. It will be using them.

The chance of this causing a real problem is very small, because
there will be some sleeping before any of the waitqueues get used.
I got a crash only after inserting an artificial sleep in iavf_probe.

Queue the watchdog_task as the last step in iavf_probe. Add a comment to
prevent repeating the mistake.

Fixes: fe2647ab0c99 ("i40evf: prevent VF close returning before state transitions to DOWN")
Signed-off-by: Michal Schmidt <mschmidt@xxxxxxxxxx>
Reviewed-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 8ea5c0825c3c4..14875cd85a8e3 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -4982,8 +4982,6 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	INIT_WORK(&adapter->finish_config, iavf_finish_config);
 	INIT_DELAYED_WORK(&adapter->watchdog_task, iavf_watchdog_task);
 	INIT_DELAYED_WORK(&adapter->client_task, iavf_client_task);
-	queue_delayed_work(adapter->wq, &adapter->watchdog_task,
-			   msecs_to_jiffies(5 * (pdev->devfn & 0x07)));
 
 	/* Setup the wait queue for indicating transition to down status */
 	init_waitqueue_head(&adapter->down_waitqueue);
@@ -4994,6 +4992,9 @@ static int iavf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* Setup the wait queue for indicating virtchannel events */
 	init_waitqueue_head(&adapter->vc_waitqueue);
 
+	queue_delayed_work(adapter->wq, &adapter->watchdog_task,
+			   msecs_to_jiffies(5 * (pdev->devfn & 0x07)));
+	/* Initialization goes on in the work. Do not add more of it below. */
 	return 0;
 
 err_ioremap:
-- 
2.42.0






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