Hi,
there is a hardcoded sleep 3 in the usb.agent. But this is wrong,
because the kernel runs all hotplug events at once for a new hub. The
result is that every event still runs in parallel, just 3 seconds later.
This patch implements an userland fifo.
touch an unique file
wait one second to let things settle
build a list with lockfiles, oldest last
grab the pid of the oldest agent
if this pid match the running agent, proceed
if all lockfiles are gone, proceed as well, provides a way to workaround
a hanging event
otherwise wait a second and try again
Index: etc/hotplug/usb.agent
===================================================================
--- etc/hotplug/usb.agent (revision 13)
+++ etc/hotplug/usb.agent (working copy)
@@ -367,7 +367,15 @@
# with slow HID devices and "usbmodules".
# starting with 2.5, all hcds must queue control traffic.
if [ "$DEVPATH" = "" ]; then
- sleep 3
+ touch "${REMOVER}.queue.$$"
+ until [ `sleep 1` ] ; do
+ lockfiles=`ls -t /var/run/usb/*.queue.* 2>/dev/null`
+ pid=${lockfiles##*.}
+ debug_mesg $pid $lockfiles
+ test "$pid" = "$$" && { debug_mesg pid $$ proceeds ; break; }
+ test "$lockfiles" = "" && { debug_mesg all lockfiles gone ; break; }
+ debug_mesg wait 1 second for pid $pid
+ done
fi
usb_convert_vars
@@ -426,6 +434,10 @@
/sbin/devlabel restart
fi
+ if [ -e "${REMOVER}.queue.$$" ]; then
+ debug_mesg pid $$ done
+ rm -f "${REMOVER}.queue.$$"
+ fi
;;
remove)
--
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