linux-kernel - Re: [PATCH -mm] Blackfin: blackfin i2c driver

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Message-ID: <4e5ebad50703062117j5a6866d9x8580060ae0f83a94@mail.gmail.com>
Date:	Wed, 7 Mar 2007 13:17:57 +0800
From:	"Sonic Zhang" <sonic.adi@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	bryan.wu@...log.com, khali@...ux-fr.org,
	linux-kernel@...r.kernel.org, mhfan@...c.edu
Subject: Re: [PATCH -mm] Blackfin: blackfin i2c driver

On 3/6/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 06 Mar 2007 14:54:18 +0800 "Wu, Bryan" <bryan.wu@...log.com> wrote:
>
> > Hi folks,
> >
> > [PATCH] Blackfin: blackfin i2c driver
> >

> > +     struct i2c_msg *pmsg;
> > +     int i, ret;
> > +     int rc = 0;
> > +
> > +     if (!(bfin_read_TWI_CONTROL() & TWI_ENA))
> > +             return -ENXIO;
> > +
> > +     down(&iface->twi_lock);
> > +
> > +     while (bfin_read_TWI_MASTER_STAT() & BUSBUSY) {
> > +             up(&iface->twi_lock);
> > +             schedule();
> > +             down(&iface->twi_lock);
> > +     }
>
> That's a busy loop until this task's timeslice has expired.  It'll work,
> but it'll suck a bit.  (Repeated in several places)
>

OK, I change it into yield(). So, current process will be move to the
tail of the run queue. Is that OK with you?
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