s2disk / resume: Add grace period to allow resume device to come online
Original patch from Dominique Brazziel <dbrazziel@snet.net>
Tue, 12 Jun 2007 00:11:37 -0400 Original mail:
"I have an old system (eMachine 433MH) with a new external USB drive
(which is actually faster than the internal hard drive that came with
the box). It takes a few seconds for the Linux to bring it online, due
in some part I think to a 5 second delay in kernel driver usb-storage
(specifically usb.c). This console message gives a clue as to what is
happening:
usb-storage: waiting for device to settle before scanning
Once I installed uswsusp I noticed the boot process stopping because the
'stat' call only happens once (and fails), but almost immediately
afterward the drive would come online.
I worked up a patch that issues the stat call, sleeps for half a second
then checks again. If it's successful it breaks out of the loop. I set
the loop counter to 60 for a 30 second timeout. It takes about 5 to 10
seconds for the drive to come online on my system but again, my system
is slow, mileage may vary."
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
1 file changed
