netdev - Re: [PATCH] Remove cli()/sti() calls from HYSDN driver.

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Message-Id: <200805071225.23643.Mark.Asselstine@windriver.com>
Date:	Wed, 7 May 2008 12:25:23 -0400
From:	"M. Asselstine" <Mark.Asselstine@...driver.com>
To:	akpm@...ux-foundation.org
Cc:	Karsten Keil <kkeil@...e.de>, kernel-janitors@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] Remove cli()/sti() calls from HYSDN driver.

On Friday 02 May 2008, Karsten Keil wrote:
> On Thu, May 01, 2008 at 04:16:52PM -0400, Mark Asselstine wrote:
> > >From looking at this driver the use of cli()/sti() within the do/while
> >
> > was a way to ensure interrupts were only disabled for short periods of
> > time while the bulk of the time interrupts were free to occur. The
> > use of the spin lock has eliminated the need to play with interrupts
> > in this way while still allowing for IO to be protected.
> >
> > The remaining 3 sti() calls seem unneeded now that at no other point
> > in the driver is there a call to cli().
> >
> > Signed-off-by: Mark Asselstine <mark.asselstine@...driver.com>
>
>   Acked-by: Karsten Keil <kkeil@...e.de>
>
Andrew, 

Would it be possible to include this commit in your tree. It is the last of 
the cli()/sti() calls and I would love to get his work completed. The patch 
has been vetted in kernel-janitors and netdev but no one has picked it up 
yet. unfortunately.

Thanks,
Mark
> > ---
> >  drivers/isdn/hysdn/boardergo.c |   14 +++++---------
> >  1 files changed, 5 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/isdn/hysdn/boardergo.c
> > b/drivers/isdn/hysdn/boardergo.c index 6cdbad3..3eb096f 100644
> > --- a/drivers/isdn/hysdn/boardergo.c
> > +++ b/drivers/isdn/hysdn/boardergo.c
> > @@ -64,10 +64,11 @@ ergo_interrupt(int intno, void *dev_id)
> >  }				/* ergo_interrupt */
> >
> > 
> > /************************************************************************
> >******/ -/* ergo_irq_bh is the function called by the immediate kernel
> > task list after */ -/* being activated with queue_task and no interrupts
> > active. This task is the */ -/* only one handling data transfer from or
> > to the card after booting. The task */ -/* may be queued from everywhere
> > (interrupts included).                       */ +/* ergo_irq_bh will be
> > called as part of the kernel clearing its shared work  */ +/* queue
> > sometime after a call to schedule_work has been made passing our     */
> > +/* work_struct. This task is the only one handling data transfer from or
> > to   */ +/* the card after booting. The task may be queued from
> > everywhere             */ +/* (interrupts included).                     
> >                                */
> > /************************************************************************
> >******/ static void
> >  ergo_irq_bh(struct work_struct *ugli_api)
> > @@ -90,7 +91,6 @@ ergo_irq_bh(struct work_struct *ugli_api)
> >  	card->hw_lock = 1;	/* we now lock the hardware */
> >
> >  	do {
> > -		sti();		/* reenable other ints */
> >  		again = 0;	/* assume loop not to be repeated */
> >
> >  		if (!dpr->ToHyFlag) {
> > @@ -110,7 +110,6 @@ ergo_irq_bh(struct work_struct *ugli_api)
> >  				again = 1;	/* restart loop */
> >  			}
> >  		}		/* a message has arrived for us */
> > -		cli();		/* no further ints */
> >  		if (again) {
> >  			dpr->ToHyInt = 1;
> >  			dpr->ToPcInt = 1;	/* interrupt to E1 for all cards */
> > @@ -242,7 +241,6 @@ ergo_writebootimg(struct HYSDN_CARD *card, unsigned
> > char *buf, byteout(card->iobase + PCI9050_USER_IO, PCI9050_E1_RUN);	/*
> > start E1 processor */ /* the interrupts are still masked */
> >
> > -		sti();
> >  		msleep_interruptible(20);		/* Timeout 20ms */
> >
> >  		if (((tDpramBootSpooler *) card->dpram)->Len !=
> > DPRAM_SPOOLER_DATA_SIZE) { @@ -276,7 +274,6 @@ ergo_writebootseq(struct
> > HYSDN_CARD *card, unsigned char *buf, int len) dst = sp->Data;		/* point
> > to data in spool structure */
> >  	buflen = sp->Len;	/* maximum len of spooled data */
> >  	wr_mirror = sp->WrPtr;	/* only once read */
> > -	sti();
> >
> >  	/* try until all bytes written or error */
> >  	i = 0x1000;		/* timeout value */
> > @@ -380,7 +377,6 @@ ergo_waitpofready(struct HYSDN_CARD *card)
> >  #endif /* CONFIG_HYSDN_CAPI */
> >  			return (0);	/* success */
> >  		}		/* data has arrived */
> > -		sti();
> >  		msleep_interruptible(50);		/* Timeout 50ms */
> >  	}			/* wait until timeout */
> >
> > --
> > 1.5.5.1


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