linux-kernel - Re: [PATCH 1/9] drivers/net: remove unnecessary flush_scheduled

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Message-ID: <20101215005436.GB10280@exar.com>
Date:	Tue, 14 Dec 2010 18:54:36 -0600
From:	Jon Mason <jon.mason@...r.com>
To:	Tejun Heo <tj@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	Wolfgang Grandegger <wg@...ndegger.com>,
	"Stephen Hemminger" <shemminger@...ux-foundation.org>,
	Ramkrishna Vepa <Ramkrishna.Vepa@...r.com>,
	Sivakumar Subramani <Sivakumar.Subramani@...r.com>,
	Sreenivasa Honnur <Sreenivasa.Honnur@...r.com>
Subject: Re: [PATCH 1/9] drivers/net: remove unnecessary
 flush_scheduled_work() calls

On Sun, Dec 12, 2010 at 07:52:57AM -0800, Tejun Heo wrote:
> janz-ican3, sh_eth, skge and vxge don't use workqueue at all and there
> is no reason to flush the system_wq.  Drop flush_scheduled_work()
> calls and references to workqueue.

I believe you were referencing an older version of the vxge driver.
These is now a reset task that runs on the system workqueue.  Based on
your other patches, the flush_scheduled_work should be replaced with a
cancel_delayed_work_sync(&vdev->reset_task)

Thanks,
Jon

>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Wolfgang Grandegger <wg@...ndegger.com>
> Cc: Stephen Hemminger <shemminger@...ux-foundation.org>
> Cc: Ramkrishna Vepa <ramkrishna.vepa@...r.com>
> Cc: Sivakumar Subramani <sivakumar.subramani@...r.com>
> Cc: Sreenivasa Honnur <sreenivasa.honnur@...r.com>
> Cc: Jon Mason <jon.mason@...r.com>
> Cc: netdev@...r.kernel.org
> ---
>  drivers/net/can/janz-ican3.c |    9 ---------
>  drivers/net/sh_eth.c         |    1 -
>  drivers/net/sh_eth.h         |    1 -
>  drivers/net/skge.c           |    2 --
>  drivers/net/vxge/vxge-main.c |    2 --
>  5 files changed, 0 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/net/can/janz-ican3.c b/drivers/net/can/janz-ican3.c
> index 6e533dc..b9a6d7a 100644
> --- a/drivers/net/can/janz-ican3.c
> +++ b/drivers/net/can/janz-ican3.c
> @@ -1114,11 +1114,6 @@ static bool ican3_txok(struct ican3_dev *mod)
>  /*
>   * Recieve one CAN frame from the hardware
>   *
> - * This works like the core of a NAPI function, but is intended to be called
> - * from workqueue context instead. This driver already needs a workqueue to
> - * process control messages, so we use the workqueue instead of using NAPI.
> - * This was done to simplify locking.
> - *
>   * CONTEXT: must be called from user context
>   */
>  static int ican3_recv_skb(struct ican3_dev *mod)
> @@ -1251,7 +1246,6 @@ static irqreturn_t ican3_irq(int irq, void *dev_id)
>   * Reset an ICAN module to its power-on state
>   *
>   * CONTEXT: no network device registered
> - * LOCKING: work function disabled
>   */
>  static int ican3_reset_module(struct ican3_dev *mod)
>  {
> @@ -1262,9 +1256,6 @@ static int ican3_reset_module(struct ican3_dev *mod)
>       /* disable interrupts so no more work is scheduled */
>       iowrite8(1 << mod->num, &mod->ctrl->int_disable);
>
> -     /* flush any pending work */
> -     flush_scheduled_work();
> -
>       /* the first unallocated page in the DPM is #9 */
>       mod->free_page = DPM_FREE_START;
>
> diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
> index b12660d..819c175 100644
> --- a/drivers/net/sh_eth.c
> +++ b/drivers/net/sh_eth.c
> @@ -1552,7 +1552,6 @@ static int sh_eth_drv_remove(struct platform_device *pdev)
>
>       sh_mdio_release(ndev);
>       unregister_netdev(ndev);
> -     flush_scheduled_work();
>       pm_runtime_disable(&pdev->dev);
>       free_netdev(ndev);
>       platform_set_drvdata(pdev, NULL);
> diff --git a/drivers/net/sh_eth.h b/drivers/net/sh_eth.h
> index 8b47763..efa6422 100644
> --- a/drivers/net/sh_eth.h
> +++ b/drivers/net/sh_eth.h
> @@ -26,7 +26,6 @@
>  #include <linux/module.h>
>  #include <linux/kernel.h>
>  #include <linux/spinlock.h>
> -#include <linux/workqueue.h>
>  #include <linux/netdevice.h>
>  #include <linux/phy.h>
>
> diff --git a/drivers/net/skge.c b/drivers/net/skge.c
> index 220e039..8c1404b 100644
> --- a/drivers/net/skge.c
> +++ b/drivers/net/skge.c
> @@ -4012,8 +4012,6 @@ static void __devexit skge_remove(struct pci_dev *pdev)
>       if (!hw)
>               return;
>
> -     flush_scheduled_work();
> -
>       dev1 = hw->dev[1];
>       if (dev1)
>               unregister_netdev(dev1);
> diff --git a/drivers/net/vxge/vxge-main.c b/drivers/net/vxge/vxge-main.c
> index b771e4b..537ad87 100644
> --- a/drivers/net/vxge/vxge-main.c
> +++ b/drivers/net/vxge/vxge-main.c
> @@ -3439,8 +3439,6 @@ static void vxge_device_unregister(struct __vxge_hw_device *hldev)
>
>       strncpy(buf, dev->name, IFNAMSIZ);
>
> -     flush_scheduled_work();
> -
>       /* in 2.6 will call stop() if device is up */
>       unregister_netdev(dev);
>
> --
> 1.7.1
>

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