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Commit 8d9853d9 authored by Ben Hutchings's avatar Ben Hutchings Committed by Jeff Garzik
Browse files

sfc: Use a separate workqueue for resets 



This avoids deadlock in case a reset is triggered during self-test.

Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 9dadae68

drivers/net/sfc/efx.c

+17 −3
Original line number Diff line number Diff line
@@ -1762,7 +1762,7 @@ void efx_schedule_reset(struct efx_nic *efx, enum reset_type type) 


	efx->reset_pending = method;



	queue_work(efx->workqueue, &efx->reset_work);

	queue_work(efx->reset_workqueue, &efx->reset_work);

}



/**************************************************************************
@@ -1907,14 +1907,28 @@ static int efx_init_struct(struct efx_nic *efx, struct efx_nic_type *type, 
		goto fail1;

	}



	efx->reset_workqueue = create_singlethread_workqueue("sfc_reset");

	if (!efx->reset_workqueue) {

		rc = -ENOMEM;

		goto fail2;

	}



	return 0;



 fail2:

	destroy_workqueue(efx->workqueue);

	efx->workqueue = NULL;



 fail1:

	return rc;

}



static void efx_fini_struct(struct efx_nic *efx)

{

	if (efx->reset_workqueue) {

		destroy_workqueue(efx->reset_workqueue);

		efx->reset_workqueue = NULL;

	}

	if (efx->workqueue) {

		destroy_workqueue(efx->workqueue);

		efx->workqueue = NULL;
@@ -1977,7 +1991,7 @@ static void efx_pci_remove(struct pci_dev *pci_dev) 
	 * scheduled from this point because efx_stop_all() has been

	 * called, we are no longer registered with driverlink, and

	 * the net_device's have been removed. */

	flush_workqueue(efx->workqueue);

	flush_workqueue(efx->reset_workqueue);



	efx_pci_remove_main(efx);
@@ -2098,7 +2112,7 @@ static int __devinit efx_pci_probe(struct pci_dev *pci_dev, 
		 * scheduled since efx_stop_all() has been called, and we

		 * have not and never have been registered with either

		 * the rtnetlink or driverlink layers. */

		cancel_work_sync(&efx->reset_work);

		flush_workqueue(efx->reset_workqueue);



		/* Retry if a recoverably reset event has been scheduled */

		if ((efx->reset_pending != RESET_TYPE_INVISIBLE) &&

drivers/net/sfc/net_driver.h

+4 −1
Original line number Diff line number Diff line
@@ -616,7 +616,9 @@ union efx_multicast_hash { 
 * @pci_dev: The PCI device

 * @type: Controller type attributes

 * @legacy_irq: IRQ number

 * @workqueue: Workqueue for resets, port reconfigures and the HW monitor

 * @workqueue: Workqueue for port reconfigures and the HW monitor.

 *	Work items do not hold and must not acquire RTNL.

 * @reset_workqueue: Workqueue for resets.  Work item will acquire RTNL.

 * @reset_work: Scheduled reset workitem

 * @monitor_work: Hardware monitor workitem

 * @membase_phys: Memory BAR value as physical address
@@ -684,6 +686,7 @@ struct efx_nic { 
	const struct efx_nic_type *type;

	int legacy_irq;

	struct workqueue_struct *workqueue;

	struct workqueue_struct *reset_workqueue;

	struct work_struct reset_work;

	struct delayed_work monitor_work;

	resource_size_t membase_phys;