[Intel-wired-lan] [Patch 0/2] iavf: Fix panics due to active work queues being freed in iavf_remove()

[Intel-wired-lan] [Patch 0/2] iavf: Fix panics due to active work queues being freed in iavf_remove()

[Ken Cox]

This series fixes panics that occur after iavf_remove() is called.

The panics occur because the iavf_adapter structure is freed at the end
of iavf_remove(), but it is possible that new work has been scheduled using
the work_struct's contained within the iavf_adapter structure.  If this occurs, the system will panic when it later tries to process the work queue.

Ken Cox (2):
  iavf: Fix panic in iavf_remove
  iavf: Prevent reset from being scheduled while adapter is being
    removed

 drivers/net/ethernet/intel/iavf/iavf_ethtool.c  |  7 +++++--
 drivers/net/ethernet/intel/iavf/iavf_main.c     | 17 +++++++++++------
 drivers/net/ethernet/intel/iavf/iavf_virtchnl.c |  4 +++-
 3 files changed, 19 insertions(+), 9 deletions(-)

-- 
2.31.1

[Intel-wired-lan] [Patch 1/2] iavf: Fix panic in iavf_remove

[Ken Cox]

It's possible for the client_task to get scheduled by the watchdog
after cancel_delayed_work_sync(&adapter->client_task);  This can cause
a panic because free_netdev() is called with the client_task still queued
on the work queue.

The stack backtrace usually looks similar to:

[  121.272963] Workqueue:  0x0 (iavf)
[  121.272969] RIP: 0010:__list_del_entry_valid.cold.1+0x20/0x4c
...
[  121.272980] Call Trace:
[  121.272985]  move_linked_works+0x49/0xa0
[  121.272988]  pwq_activate_delayed_work+0x43/0x100
[  121.272991]  pwq_dec_nr_in_flight+0x5d/0x90
[  121.272993]  worker_thread+0x30/0x370
[  121.272995]  ? process_one_work+0x420/0x420
[  121.272998]  kthread+0x15d/0x180
[  121.273000]  ? __kthread_parkme+0xa0/0xa0
[  121.273003]  ret_from_fork+0x1f/0x40

Signed-off-by: Ken Cox <jkc@redhat.com>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 6c2afbc8acbcd..63eec7edbf60a 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -3940,7 +3940,6 @@ static void iavf_remove(struct pci_dev *pdev)
 	set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
 	cancel_delayed_work_sync(&adapter->init_task);
 	cancel_work_sync(&adapter->reset_task);
-	cancel_delayed_work_sync(&adapter->client_task);
 	if (adapter->netdev_registered) {
 		unregister_netdev(netdev);
 		adapter->netdev_registered = false;
@@ -3974,6 +3973,7 @@ static void iavf_remove(struct pci_dev *pdev)
 	iavf_free_q_vectors(adapter);
 
 	cancel_delayed_work_sync(&adapter->watchdog_task);
+	cancel_delayed_work_sync(&adapter->client_task);
 
 	cancel_work_sync(&adapter->adminq_task);
 
-- 
2.31.1

[Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being scheduled while adapter is being removed

[Ken Cox]

If a reset gets scheduled while the adapter is being removed it can
cause a panic.

The work_struct for the reset_task is contained in the iavf_adapter
structure.  iavf_remove() eventually frees the iavf_adapter structure
so if there is active work scheduled it can cause a panic.

Signed-off-by: Ken Cox <jkc@redhat.com>
---
 drivers/net/ethernet/intel/iavf/iavf_ethtool.c  |  7 +++++--
 drivers/net/ethernet/intel/iavf/iavf_main.c     | 15 ++++++++++-----
 drivers/net/ethernet/intel/iavf/iavf_virtchnl.c |  4 +++-
 3 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
index af43fbd8cb75e..3cf1679153604 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
@@ -519,7 +519,9 @@ static int iavf_set_priv_flags(struct net_device *netdev, u32 flags)
 
 	/* issue a reset to force legacy-rx change to take effect */
 	if (changed_flags & IAVF_FLAG_LEGACY_RX) {
-		if (netif_running(netdev)) {
+
+		if (netif_running(netdev) &&
+		    !test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section)) {
 			adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 			queue_work(iavf_wq, &adapter->reset_task);
 		}
@@ -630,7 +632,8 @@ static int iavf_set_ringparam(struct net_device *netdev,
 	adapter->tx_desc_count = new_tx_count;
 	adapter->rx_desc_count = new_rx_count;
 
-	if (netif_running(netdev)) {
+	if (netif_running(netdev) &&
+	    !test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section)) {
 		adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 		queue_work(iavf_wq, &adapter->reset_task);
 	}
diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index 63eec7edbf60a..af2788c997ca2 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -164,7 +164,8 @@ static int iavf_lock_timeout(struct iavf_adapter *adapter,
 void iavf_schedule_reset(struct iavf_adapter *adapter)
 {
 	if (!(adapter->flags &
-	      (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED))) {
+	      (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED)) &&
+	    !test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section)) {
 		adapter->flags |= IAVF_FLAG_RESET_NEEDED;
 		queue_work(iavf_wq, &adapter->reset_task);
 	}
@@ -2013,7 +2014,8 @@ static void iavf_watchdog_task(struct work_struct *work)
 		adapter->aq_required = 0;
 		adapter->current_op = VIRTCHNL_OP_UNKNOWN;
 		dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
-		queue_work(iavf_wq, &adapter->reset_task);
+		if (!test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section))
+			queue_work(iavf_wq, &adapter->reset_task);
 		goto watchdog_done;
 	}
 
@@ -3348,8 +3350,10 @@ static int iavf_change_mtu(struct net_device *netdev, int new_mtu)
 		iavf_notify_client_l2_params(&adapter->vsi);
 		adapter->flags |= IAVF_FLAG_SERVICE_CLIENT_REQUESTED;
 	}
-	adapter->flags |= IAVF_FLAG_RESET_NEEDED;
-	queue_work(iavf_wq, &adapter->reset_task);
+	if (!test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section)) {
+		adapter->flags |= IAVF_FLAG_RESET_NEEDED;
+		queue_work(iavf_wq, &adapter->reset_task);
+	}
 
 	return 0;
 }
@@ -3909,7 +3913,8 @@ static int __maybe_unused iavf_resume(struct device *dev_d)
 		return err;
 	}
 
-	queue_work(iavf_wq, &adapter->reset_task);
+	if (!test_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section))
+		queue_work(iavf_wq, &adapter->reset_task);
 
 	netif_device_attach(netdev);
 
diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 0eab3c43bdc59..ba973b2ab0547 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -1470,7 +1470,9 @@ void iavf_virtchnl_completion(struct iavf_adapter *adapter,
 			break;
 		case VIRTCHNL_EVENT_RESET_IMPENDING:
 			dev_info(&adapter->pdev->dev, "Reset warning received from the PF\n");
-			if (!(adapter->flags & IAVF_FLAG_RESET_PENDING)) {
+			if (!(adapter->flags & IAVF_FLAG_RESET_PENDING) &&
+			    !test_bit(__IAVF_IN_REMOVE_TASK,
+				      &adapter->crit_section)) {
 				adapter->flags |= IAVF_FLAG_RESET_PENDING;
 				dev_info(&adapter->pdev->dev, "Scheduling reset task\n");
 				queue_work(iavf_wq, &adapter->reset_task);
-- 
2.31.1

[Intel-wired-lan] [Patch 1/2] iavf: Fix panic in iavf_remove

[Jankowski, Konrad0]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Ken Cox
> Sent: ?roda, 8 grudnia 2021 11:22
> To: intel-wired-lan at osuosl.org
> Cc: Ken Cox <jkc@redhat.com>
> Subject: [Intel-wired-lan] [Patch 1/2] iavf: Fix panic in iavf_remove
> 
> It's possible for the client_task to get scheduled by the watchdog after
> cancel_delayed_work_sync(&adapter->client_task);  This can cause a panic
> because free_netdev() is called with the client_task still queued on the work
> queue.
> 
> The stack backtrace usually looks similar to:
> 
> [  121.272963] Workqueue:  0x0 (iavf)
> [  121.272969] RIP: 0010:__list_del_entry_valid.cold.1+0x20/0x4c
> ...
> [  121.272980] Call Trace:
> [  121.272985]  move_linked_works+0x49/0xa0 [  121.272988]
> pwq_activate_delayed_work+0x43/0x100
> [  121.272991]  pwq_dec_nr_in_flight+0x5d/0x90 [  121.272993]
> worker_thread+0x30/0x370 [  121.272995]  ?
> process_one_work+0x420/0x420 [  121.272998]  kthread+0x15d/0x180 [
> 121.273000]  ? __kthread_parkme+0xa0/0xa0 [  121.273003]
> ret_from_fork+0x1f/0x40
> 
> Signed-off-by: Ken Cox <jkc@redhat.com>
> ---
>  drivers/net/ethernet/intel/iavf/iavf_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c
> b/drivers/net/ethernet/intel/iavf/iavf_main.c
> index 6c2afbc8acbcd..63eec7edbf60a 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
> @@ -3940,7 +3940,6 @@ static void iavf_remove(struct pci_dev *pdev)

Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>

[Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being scheduled while adapter is being removed

[Jankowski, Konrad0]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of
> Ken Cox
> Sent: ?roda, 8 grudnia 2021 11:22
> To: intel-wired-lan at osuosl.org
> Cc: Ken Cox <jkc@redhat.com>
> Subject: [Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being
> scheduled while adapter is being removed
> 
> If a reset gets scheduled while the adapter is being removed it can cause a
> panic.
> 
> The work_struct for the reset_task is contained in the iavf_adapter
> structure.  iavf_remove() eventually frees the iavf_adapter structure so if
> there is active work scheduled it can cause a panic.
> 
> Signed-off-by: Ken Cox <jkc@redhat.com>
> ---
>  drivers/net/ethernet/intel/iavf/iavf_ethtool.c  |  7 +++++--
>  drivers/net/ethernet/intel/iavf/iavf_main.c     | 15 ++++++++++-----
>  drivers/net/ethernet/intel/iavf/iavf_virtchnl.c |  4 +++-
>  3 files changed, 18 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> index af43fbd8cb75e..3cf1679153604 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> @@ -519,7 +519,9 @@ static int iavf_set_priv_flags(struct net_device

Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>

[Intel-wired-lan] [Patch 1/2] iavf: Fix panic in iavf_remove

[Jankowski, Konrad0]

I'm sorry, this was not sent to me, it is still untested

[Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being scheduled while adapter is being removed

[Jankowski, Konrad0]

> -----Original Message-----
> From: Jankowski, Konrad0
> Sent: sobota, 11 grudnia 2021 12:26
> To: Ken Cox <jkc@redhat.com>; intel-wired-lan at osuosl.org
> Subject: RE: [Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being
> scheduled while adapter is being removed
> 
> 
> 
> > -----Original Message-----
> > From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf
> > Of Ken Cox
> > Sent: ?roda, 8 grudnia 2021 11:22
> > To: intel-wired-lan at osuosl.org
> > Cc: Ken Cox <jkc@redhat.com>
> > Subject: [Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being
> > scheduled while adapter is being removed
> >
> > If a reset gets scheduled while the adapter is being removed it can
> > cause a panic.
> >
> > The work_struct for the reset_task is contained in the iavf_adapter
> > structure.  iavf_remove() eventually frees the iavf_adapter structure
> > so if there is active work scheduled it can cause a panic.
> >
> > Signed-off-by: Ken Cox <jkc@redhat.com>
> > ---
> >  drivers/net/ethernet/intel/iavf/iavf_ethtool.c  |  7 +++++--
> >  drivers/net/ethernet/intel/iavf/iavf_main.c     | 15 ++++++++++-----
> >  drivers/net/ethernet/intel/iavf/iavf_virtchnl.c |  4 +++-
> >  3 files changed, 18 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> > b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> > index af43fbd8cb75e..3cf1679153604 100644
> > --- a/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> > +++ b/drivers/net/ethernet/intel/iavf/iavf_ethtool.c
> > @@ -519,7 +519,9 @@ static int iavf_set_priv_flags(struct net_device
> 

I'm sorry, this was not sent to me, it is still untested

[Intel-wired-lan] [Patch 1/2] iavf: Fix panic in iavf_remove

[Nguyen, Anthony L]

On Wed, 2021-12-08 at 04:21 -0600, Ken Cox wrote:
> It's possible for the client_task to get scheduled by the watchdog
> after cancel_delayed_work_sync(&adapter->client_task);? This can
> cause
> a panic because free_netdev() is called with the client_task still
> queued
> on the work queue.
> 
> The stack backtrace usually looks similar to:
> 
> [? 121.272963] Workqueue:? 0x0 (iavf)
> [? 121.272969] RIP: 0010:__list_del_entry_valid.cold.1+0x20/0x4c
> ...
> [? 121.272980] Call Trace:
> [? 121.272985]? move_linked_works+0x49/0xa0
> [? 121.272988]? pwq_activate_delayed_work+0x43/0x100
> [? 121.272991]? pwq_dec_nr_in_flight+0x5d/0x90
> [? 121.272993]? worker_thread+0x30/0x370
> [? 121.272995]? ? process_one_work+0x420/0x420
> [? 121.272998]? kthread+0x15d/0x180
> [? 121.273000]? ? __kthread_parkme+0xa0/0xa0
> [? 121.273003]? ret_from_fork+0x1f/0x40
> 
> Signed-off-by: Ken Cox <jkc@redhat.com>
> ---
> ?drivers/net/ethernet/intel/iavf/iavf_main.c | 2 +-
> ?1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c
> b/drivers/net/ethernet/intel/iavf/iavf_main.c
> index 6c2afbc8acbcd..63eec7edbf60a 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
> @@ -3940,7 +3940,6 @@ static void iavf_remove(struct pci_dev *pdev)
> ????????set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
> ????????cancel_delayed_work_sync(&adapter->init_task);
> ????????cancel_work_sync(&adapter->reset_task);
> -???????cancel_delayed_work_sync(&adapter->client_task);
> ????????if (adapter->netdev_registered) {
> ????????????????unregister_netdev(netdev);
> ????????????????adapter->netdev_registered = false;
> @@ -3974,6 +3973,7 @@ static void iavf_remove(struct pci_dev *pdev)
> ????????iavf_free_q_vectors(adapter);
> ?
> ????????cancel_delayed_work_sync(&adapter->watchdog_task);
> +???????cancel_delayed_work_sync(&adapter->client_task);
> ?
> ????????cancel_work_sync(&adapter->adminq_task);
> ?

Hi Ken,

What tree is this patch based on? This doesn't apply to either of the
IWL trees or the netdev trees.

The ordering looks correct on the kernel tree with watchdog_task being
cancelled before the client_task [1]. However, we do have an extra
'cancel_delayed_work_sync(&adapter->watchdog_task)'. I'll get a patch
together to remove the extra one.

Thanks,
Tony


[1] https://elixir.bootlin.com/linux/v5.16-
rc5/source/drivers/net/ethernet/intel/iavf/iavf_main.c#3979

[Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being scheduled while adapter is being removed

[Nguyen, Anthony L]

On Wed, 2021-12-08 at 04:21 -0600, Ken Cox wrote:
> If a reset gets scheduled while the adapter is being removed it can
> cause a panic.
> 
> The work_struct for the reset_task is contained in the iavf_adapter
> structure.? iavf_remove() eventually frees the iavf_adapter structure
> so if there is active work scheduled it can cause a panic.
> 
> Signed-off-by: Ken Cox <jkc@redhat.com>

Like the other patch, this one isn't applying.

Thanks,
Tony

[Intel-wired-lan] [Patch 1/2] iavf: Fix panic in iavf_remove

[Ken Cox]

On 12/13/21 12:26, Nguyen, Anthony L wrote:
> On Wed, 2021-12-08 at 04:21 -0600, Ken Cox wrote:
>> It's possible for the client_task to get scheduled by the watchdog
>> after cancel_delayed_work_sync(&adapter->client_task);? This can
>> cause
>> a panic because free_netdev() is called with the client_task still
>> queued
>> on the work queue.
>>
>> The stack backtrace usually looks similar to:
>>
>> [? 121.272963] Workqueue:? 0x0 (iavf)
>> [? 121.272969] RIP: 0010:__list_del_entry_valid.cold.1+0x20/0x4c
>> ...
>> [? 121.272980] Call Trace:
>> [? 121.272985]? move_linked_works+0x49/0xa0
>> [? 121.272988]? pwq_activate_delayed_work+0x43/0x100
>> [? 121.272991]? pwq_dec_nr_in_flight+0x5d/0x90
>> [? 121.272993]? worker_thread+0x30/0x370
>> [? 121.272995]? ? process_one_work+0x420/0x420
>> [? 121.272998]? kthread+0x15d/0x180
>> [? 121.273000]? ? __kthread_parkme+0xa0/0xa0
>> [? 121.273003]? ret_from_fork+0x1f/0x40
>>
>> Signed-off-by: Ken Cox <jkc@redhat.com>
>> ---
>>  ?drivers/net/ethernet/intel/iavf/iavf_main.c | 2 +-
>>  ?1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c
>> b/drivers/net/ethernet/intel/iavf/iavf_main.c
>> index 6c2afbc8acbcd..63eec7edbf60a 100644
>> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c
>> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
>> @@ -3940,7 +3940,6 @@ static void iavf_remove(struct pci_dev *pdev)
>>  ????????set_bit(__IAVF_IN_REMOVE_TASK, &adapter->crit_section);
>>  ????????cancel_delayed_work_sync(&adapter->init_task);
>>  ????????cancel_work_sync(&adapter->reset_task);
>> -???????cancel_delayed_work_sync(&adapter->client_task);
>>  ????????if (adapter->netdev_registered) {
>>  ????????????????unregister_netdev(netdev);
>>  ????????????????adapter->netdev_registered = false;
>> @@ -3974,6 +3973,7 @@ static void iavf_remove(struct pci_dev *pdev)
>>  ????????iavf_free_q_vectors(adapter);
>>   
>>  ????????cancel_delayed_work_sync(&adapter->watchdog_task);
>> +???????cancel_delayed_work_sync(&adapter->client_task);
>>   
>>  ????????cancel_work_sync(&adapter->adminq_task);
>>   
> 
> Hi Ken,
> 
> What tree is this patch based on? This doesn't apply to either of the
> IWL trees or the netdev trees.
Sorry, I was in the wrong branch when I generated these patches.  Please 
disregard.  I will re-evaluate and resend if necessary.

> 
> The ordering looks correct on the kernel tree with watchdog_task being
> cancelled before the client_task [1]. However, we do have an extra
> 'cancel_delayed_work_sync(&adapter->watchdog_task)'. I'll get a patch
> together to remove the extra one.
> 
> Thanks,
> Tony
> 
> 
> [1] https://elixir.bootlin.com/linux/v5.16-
> rc5/source/drivers/net/ethernet/intel/iavf/iavf_main.c#3979
> 

[Intel-wired-lan] [Patch 2/2] iavf: Prevent reset from being scheduled while adapter is being removed

[Ken Cox]

On 12/13/21 12:27, Nguyen, Anthony L wrote:
> On Wed, 2021-12-08 at 04:21 -0600, Ken Cox wrote:
>> If a reset gets scheduled while the adapter is being removed it can
>> cause a panic.
>>
>> The work_struct for the reset_task is contained in the iavf_adapter
>> structure.? iavf_remove() eventually frees the iavf_adapter structure
>> so if there is active work scheduled it can cause a panic.
>>
>> Signed-off-by: Ken Cox <jkc@redhat.com>
> 
> Like the other patch, this one isn't applying.
> 
> Thanks,
> Tony
> 
Sorry, I was in the wrong branch when I generated these patches.  Please 
disregard.  I will re-evaluate and resend if necessary.

[Intel-wired-lan] [Patch 0/2] iavf: Fix panics due to active work queues being freed in iavf_remove()

[Ken Cox]

On 12/8/21 04:21, Ken Cox wrote:
> This series fixes panics that occur after iavf_remove() is called.
> 
> The panics occur because the iavf_adapter structure is freed at the end
> of iavf_remove(), but it is possible that new work has been scheduled using
> the work_struct's contained within the iavf_adapter structure.  If this occurs, the system will panic when it later tries to process the work queue.
> 
> Ken Cox (2):
>    iavf: Fix panic in iavf_remove
>    iavf: Prevent reset from being scheduled while adapter is being
>      removed
> 
>   drivers/net/ethernet/intel/iavf/iavf_ethtool.c  |  7 +++++--
>   drivers/net/ethernet/intel/iavf/iavf_main.c     | 17 +++++++++++------
>   drivers/net/ethernet/intel/iavf/iavf_virtchnl.c |  4 +++-
>   3 files changed, 19 insertions(+), 9 deletions(-)
> 
NAK for this series.

These patches were generated off of the wrong branch.  I will 
re-evaluate and re-submit if necessary.