Hello.
First of all, I understand that there is no interest here in solving
FreeBSD 4.11 problems. I only post this because there
may be a chance that this could be a problem in CURRENT too.
(If no, may be someone likes to dive into ancient software bugs ;-)
I am running an embedded system under FreeBSD 4.11.
Sometimes after booting FreBSD the USB keyboard is not found
and so not automatically attached by usbd.
If I then unplug the keyboard and plug it in again the
kernel crashes with page fault in process 3 (usb0).
I currently have no debug kernel and cannot get a
kernel crash dump as I only have some limited flash memory.
But, so far I found that the crash address is in
usbdi.c, usbd_ar_pipe() at this line:
pipe->repeat=0.
The function seems to be only called from usbd_abort_pipe().
My guess is that usbd_abort_pipe() is called from ukbd_enable_intr()
in ukbd.c with a null pointer as usbd_pipe_handle.
The parts of the source I inspected seem to be unchanged in
CURRENT, so may be someone with more understanding of the
usb code has an idea about that.
So, first of all I will add a null pointer check in my
kernel source and see if it helps.
Further information: I am seeing this with and without kbdmux
(I modified an earlier and perhaps buggy kbdmux to work under 4.11).
Without kbdmux my usbd.conf contains these lines:
device "USB keyboard"
devname "ukbd0"
attach "/usr/sbin/kbdcontrol -k /dev/kdb1 < /dev/console"
detach "/usr/sbin/kbdcontrol -k /dev/kdb0 < /dev/console"
I also have the following modification in ukbd.c which has been suggested
earlier on this list by Hans Petter Selasky. It reports a specific
ukbd detach event to be catched by usbd. Without that patch the detach line
in usbd.conf won't work:
--- /usr/local/jail/usr/src/sys//dev/usb/ukbd.c Mon Mar 1 21:56:02 2004
+++ ./dev/usb/ukbd.c Thu Feb 23 09:57:59 2006
@@ -195,6 +195,22 @@
USB_ATTACH_SUCCESS_RETURN;
}
+
+static void
+usbd_add_device_detach_event(device_t self)
+{
+ struct usb_event ue;
+
+ bzero(&ue, sizeof(ue));
+
+ strncpy(ue.u.ue_device.udi_devnames[0],
+ device_get_nameunit(self), USB_MAX_DEVNAMELEN);
+ ue.u.ue_device.udi_devnames[0][USB_MAX_DEVNAMELEN - 1] = '\0';
+
+ usb_add_event(USB_EVENT_DEVICE_DETACH, &ue);
+}
+
+
int
ukbd_detach(device_t self)
{
@@ -219,6 +235,8 @@
return error;
DPRINTF(("%s: disconnected\n", USBDEVNAME(self)));
+
+ usbd_add_device_detach_event(self);
return (0);
}
Thank you for any help or comment,
Norbert Koch
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