linux-kernel - Re: [PATCH] Make prepare_namespace() wait for devices

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Message-Id: <20070524211737.daa3c99c.akpm@linux-foundation.org>
Date:	Thu, 24 May 2007 21:17:37 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pierre Ossman <drzeus-list@...eus.cx>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Make prepare_namespace() wait for devices

On Fri, 25 May 2007 06:03:54 +0200 Pierre Ossman <drzeus-list@...eus.cx> wrote:

> Andrew Morton wrote:
> > On Thu, 24 May 2007 14:21:35 +0200
> > Pierre Ossman <drzeus-list@...eus.cx> wrote:
> >
> >   
> >> +	/* wait for any asynchronous scanning to complete */
> >> +	if ((ROOT_DEV == 0) && root_wait) {
> >> +		printk(KERN_INFO "Waiting for root device %s...\n",
> >> +			saved_root_name);
> >> +		do {
> >> +			while (driver_probe_done() != 0)
> >> +				msleep(100);
> >> +			ROOT_DEV = name_to_dev_t(saved_root_name);
> >> +			if (ROOT_DEV == 0)
> >> +				msleep(100);
> >> +		} while (ROOT_DEV == 0);
> >> +	}
> >>     
> >
> > This seems overly complex.  Can't we simply do
> >
> >
> > 	while (driver_probe_done() || ROOT_DEV == 0)
> > 		msleep(100);
> >
> > ?
> >   
> 
> How would ROOT_DEV get updated in that loop?
> 

Whatever.  I think you can work it out ;)   

while (driver_probe_done() || (ROOT_DEV = name_to_dev_t(...)) == 0)

perhaps?

The loop-which-sleeps within a loop-which-sleeps seems poorly thought out?
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