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Date: Fri, 18 Jul 2008 19:01:20 +0100 From: Ben Hutchings <bhutchings@...arflare.com> To: Jeff Garzik <jgarzik@...ox.com> Cc: netdev@...r.kernel.org, linux-net-drivers@...arflare.com Subject: [PATCH 2/4] sfc: Use a separate workqueue for resets This avoids deadlock in case a reset is triggered during self-test. Signed-off-by: Ben Hutchings <bhutchings@...arflare.com> --- drivers/net/sfc/efx.c | 20 +++++++++++++++++--- drivers/net/sfc/net_driver.h | 5 ++++- 2 files changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/net/sfc/efx.c b/drivers/net/sfc/efx.c index 0e5fecf..4e89c89 100644 --- a/drivers/net/sfc/efx.c +++ b/drivers/net/sfc/efx.c @@ -2046,7 +2046,7 @@ 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); } /************************************************************************** @@ -2204,14 +2204,28 @@ 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; @@ -2281,7 +2295,7 @@ 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); @@ -2418,7 +2432,7 @@ 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) && diff --git a/drivers/net/sfc/net_driver.h b/drivers/net/sfc/net_driver.h index 535807b..c9ce460 100644 --- a/drivers/net/sfc/net_driver.h +++ b/drivers/net/sfc/net_driver.h @@ -733,7 +733,9 @@ struct efx_nic_errors { * @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 @@ -821,6 +823,7 @@ 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; unsigned long membase_phys; -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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