Re: cold plugging

[Greg KH <greg@kroah.com>]

On Sat, Jan 14, 2006 at 12:29:45AM +0100, Pozsar Balazs wrote:
> On Fri, Jan 13, 2006 at 10:52:03AM -0800, Greg KH wrote:
> > 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.
> 
> But the above script does not guarantee that /dev/null will be created 
> first. It only orders the events, but as events are processed in 
> parallel, it may well happen that a later event gets processed earlier.

Have you seen this happen?

thanks,

greg k-h


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