iavf: initialize waitqueues before starting watchdog_task

[ 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@redhat.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index a39f7f0..1ae90f8 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -5020,8 +5020,6 @@ 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);
@@ -5032,6 +5030,9 @@ 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: