linux-kernel - Re: [PATCH] driver core: remove polling for driver_probe

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Message-ID: <20090129072938.2761a6ed@infradead.org>
Date:	Thu, 29 Jan 2009 07:29:38 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	tom.leiming@...il.com
Cc:	kay.sievers@...y.org, greg@...ah.com, linux-kernel@...r.kernel.org,
	Ming Lei <tom.leiming@...il.com>
Subject: Re: [PATCH] driver core: remove polling for driver_probe_done

> @@ -396,9 +396,9 @@ void __init prepare_namespace(void)
>  	if ((ROOT_DEV == 0) && root_wait) {
>  		printk(KERN_INFO "Waiting for root device %s...\n",
>  			saved_root_name);
> -		while (driver_probe_done() != 0 ||
> -			(ROOT_DEV = name_to_dev_t(saved_root_name))
> == 0)
> -			msleep(100);
> +		ROOT_DEV = name_to_dev_t(saved_root_name);
> +		if (ROOT_DEV)
> +			driver_probe_wait_done();
>  	}
>  

Hi,

another comment:

this is not equivalent

you turned "wait until all probing is done OR until the device exists"
into "wait until all probing is done"... which might be several seconds
longer!
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