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. Here's the patch:
--- resume.c.dpkg 2007-06-10 22:49:25.000000000 -0400
+++ resume.c 2007-06-11 23:02:33.000000000 -0400
@@ -731,6 +731,9 @@
struct stat stat_buf;
int dev;
int n, error = 0;
+ // Grace period variables
+ int loopcnt;
+ unsigned int usecs = 500000; // half a second
page_size = getpagesize();
buffer_size = BUFFER_PAGES * page_size;
@@ -755,6 +758,18 @@
if (splash_param != 'y' && splash_param != 'Y')
splash_param = 0;
+ /*
+ * 30 second grace period to allow resume device
+ * to come online (i.e. external USB drives)
+ */
+ for (loopcnt = 1; loopcnt <= 60; loopcnt++)
+ {
+ if (stat(resume_dev_name, &stat_buf) != 0)
+ usleep(usecs); // wait a half
second
+ else
+ break;
+ }
+
while (stat(resume_dev_name, &stat_buf)) {
fprintf(stderr,
"resume: Could not stat the resume device
file.\n"
--
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