From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Date: Fri, 13 Jan 2006 18:52:03 +0000
Subject: Re: cold plugging
Message-Id: <20060113185203.GA16552@kroah.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <200601131415.30207.treeve@scarlet.be>
In-Reply-To: <200601131415.30207.treeve@scarlet.be>
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To: linux-hotplug@vger.kernel.org

On Fri, Jan 13, 2006 at 09:23:51PM +0500, Alexander E. Patrakov wrote:
> Kay Sievers wrote:
> 
> >I'm using this:
> >	list=$(echo /sys/bus/*/devices/*/uevent)
> >	list="$list $(echo /sys/class/*/*/uevent)"
> >	list="$list $(echo /sys/block/*/uevent /sys/block/*/*/uevent)"
> >	for i in $list; do
> >	    case "$i" in
> >		*/device/uevent|*\**)
> >		    continue
> >		    ;;
> >		*/class/mem/*|*/class/tty/*)
> >		    first="$first $i"
> >		    ;;
> >		*/block/md*)
> >		    last="$last $i"
> >		    ;;
> >		*/*)
> >		    default="$default $i"
> >		    ;;
> >	    esac
> >	done
> >
> >	# trigger the sorted events
> >	for i in $first $default $last; do
> >	    echo "add" > "$i"
> >	done
> > 
> >
> Why sort the events? They arrive at udevd in random order anyway.

Because many things need /dev/null and the tty device nodes in their
handlers and scripts, so they need to be created first.

Try it and see if you don't believe us :)

> >To wait for the events to finish (if you need to), I do:
> >	loop00
> >	while test -d /dev/.udev/queue; do
> >	    sleep 0.1;
> >	    test "$loop" -gt 0 || break
> >	    loop=$(($loop - 1))
> >	done
> > 
> >
> USB uevents easily get past this loop. I have a check in my script that 
> sleeps 2 seconds after that and reports all new uevents in those 2 
> seconds as possible bugs.

Why does USB take longer for you?  What is taking such a long time?

thanks,

greg k-h


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