Hi all,
I have a problem of deadlock at kernel startup,
related to USB keyboard and mouse handling.
I'm working on 2.4.18-rmk6 on a board based on Samsung
S3C2800X, which is an ARM CPU.
My USB controller is a VIA VT6202 (UHCI interface).
The system hangs in most times when I boot my system
with keyboard and/or mouse attached, while it does
never hang when I boot without them and plug them
afterwards.
When the hang occurs, the system blocks before
displaying the login prompt on my serial console.
After a long session of debugging with printk, I found
out that in those cases one of the calls to
schedule_timeout() (issued when waiting for an URB
response in usb.c) never returns.
I can avoid this situation by removing the
schedule_timeout() call in usb.c:
--- original/usb.c 2002-08-14 11:50:10.000000000 +0200
+++ my/usb.c 2003-09-19 15:57:21.000000000 +0200
@@ -1078,7 +1078,7 @@
while (timeout && !awd.done)
{
- timeout = schedule_timeout(timeout);
+ //timeout = schedule_timeout(timeout);
set_current_state(TASK_UNINTERRUPTIBLE);
rmb();
}
The system seems to work correctly anyway, with the
URB requests correctly done.
It is not clear to me why this function call can cause
problems in my architecture, and I don't know either
if my modification will result in buggy or unstable
system behaviour.
What do you think about it?
Thank you in advance
--
Pier Paolo Glave
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