On Tue, May 22 2007, Ingo Molnar wrote:
>
> * Jeff Garzik <[email protected]> wrote:
>
> > >@@ -1709,12 +1710,11 @@ static int __init sjcd_init(void)
> > > printk(KERN_INFO "SJCD: Resetting: ");
> > > sjcd_send_cmd(SCMD_RESET);
> > > for (i = 1000; i > 0 && !sjcd_status_valid; --i) {
> > >- unsigned long timer;
> > >-
> > > /*
> > > * Wait 10ms approx.
> > > */
> > >- for (timer = jiffies; time_before_eq(jiffies, timer););
> > >+ msleep(10);
> > >+
> >
> > I always worry when I see code like this, wondering if there is some
> > arcane reason that I cannot fathom, that is being removed. You gotta
> > wonder how long it has been since this driver was used, by anybody.
> >
> > Oh well, I cannot find fault with the patch, paranoia worries aside.
>
> well, while i dont have that hardware, i found this by booting an
> allyesconfig bzImage which runs the code above, which locks up without
> this change. And then it booted fine with this change. So arcane issues
> aside, it does visibly improve things ;-)
But if you looked at the driver, you'd see 2 other identical busy loops
in the very same function :-)
--
Jens Axboe
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