linux-kernel - Re: [PATCH 19/32] usb/ueagle-atm: use system

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Date:	Mon, 03 Jan 2011 17:41:22 +0100
From:	castet.matthieu@...e.fr
To:	tj@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	stf_xl@...pl
Subject: Re: [PATCH 19/32] usb/ueagle-atm: use system_wq instead of dedicated workqueues

Quoting castet.matthieu@...e.fr:

> Hi,
>
> could you CC me on ueagle-atm.c patches.
>
> From what I remind we sleep in the workqueue, that's why we couldn't use the
> system one (freeze keyboard...). But may be the code changed.
For the record we still do blocking usb transfert on the workqueue.

>
>
> Matthieu
>
> Tejun Heo a écrit :
> > With cmwq, there's no reason to use separate workqueues.  Drop
> > uea_softc->work_q and use system_wq instead.  The used work item is
> > sync flushed on driver detach.
> >
> > Signed-off-by: Tejun Heo <tj@...nel.org>
> > Cc: Stanislaw Gruszka <stf_xl@...pl>
> > Cc: linux-usb@...r.kernel.org
> > ---
> > Only compile tested.  Please feel free to take it into the subsystem
> > tree or simply ack - I'll route it through the wq tree.
> >
> > Thanks.
> >
> >  drivers/usb/atm/ueagle-atm.c |   19 +++++--------------
> >  1 files changed, 5 insertions(+), 14 deletions(-)
> >
> > diff --git a/drivers/usb/atm/ueagle-atm.c b/drivers/usb/atm/ueagle-atm.c
> > index 44447f5..55c1d3b 100644
> > --- a/drivers/usb/atm/ueagle-atm.c
> > +++ b/drivers/usb/atm/ueagle-atm.c
> > @@ -168,7 +168,6 @@ struct uea_softc {
> >  	union cmv_dsc cmv_dsc;
> >
> >  	struct work_struct task;
> > -	struct workqueue_struct *work_q;
> >  	u16 pageno;
> >  	u16 ovl;
> >
> > @@ -1879,7 +1878,7 @@ static int uea_start_reset(struct uea_softc *sc)
> >  	/* start loading DSP */
> >  	sc->pageno = 0;
> >  	sc->ovl = 0;
> > -	queue_work(sc->work_q, &sc->task);
> > +	schedule_work(&sc->task);
> >
> >  	/* wait for modem ready CMV */
> >  	ret = wait_cmv_ack(sc);
> > @@ -2091,14 +2090,14 @@ static void uea_schedule_load_page_e1(struct
> uea_softc
> *sc,
> >  {
> >  	sc->pageno = intr->e1_bSwapPageNo;
> >  	sc->ovl = intr->e1_bOvl >> 4 | intr->e1_bOvl << 4;
> > -	queue_work(sc->work_q, &sc->task);
> > +	schedule_work(&sc->task);
> >  }
> >
> >  static void uea_schedule_load_page_e4(struct uea_softc *sc,
> >  						struct intr_pkt *intr)
> >  {
> >  	sc->pageno = intr->e4_bSwapPageNo;
> > -	queue_work(sc->work_q, &sc->task);
> > +	schedule_work(&sc->task);
> >  }
> >
> >  /*
> > @@ -2170,13 +2169,6 @@ static int uea_boot(struct uea_softc *sc)
> >
> >  	init_waitqueue_head(&sc->sync_q);
> >
> > -	sc->work_q = create_workqueue("ueagle-dsp");
> > -	if (!sc->work_q) {
> > -		uea_err(INS_TO_USBDEV(sc), "cannot allocate workqueue\n");
> > -		uea_leaves(INS_TO_USBDEV(sc));
> > -		return -ENOMEM;
> > -	}
> > -
> >  	if (UEA_CHIP_VERSION(sc) == ADI930)
> >  		load_XILINX_firmware(sc);
> >
> > @@ -2222,7 +2214,6 @@ err1:
> >  	sc->urb_int = NULL;
> >  	kfree(intr);
> >  err0:
> > -	destroy_workqueue(sc->work_q);
> >  	uea_leaves(INS_TO_USBDEV(sc));
> >  	return -ENOMEM;
> >  }
> > @@ -2243,8 +2234,8 @@ static void uea_stop(struct uea_softc *sc)
> >  	kfree(sc->urb_int->transfer_buffer);
> >  	usb_free_urb(sc->urb_int);
> >
> > -	/* stop any pending boot process, when no one can schedule work */
> > -	destroy_workqueue(sc->work_q);
> > +	/* flush the work item, when no one can schedule it */
> > +	flush_work_sync(&sc->task);
> >
> >  	if (sc->dsp_firm)
> >  		release_firmware(sc->dsp_firm);
>
>


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