On Tue, Jul 15, 2003 at 06:46:50PM -0700, Mike Fedyk wrote:
> On Tue, Jul 15, 2003 at 06:37:43PM -0700, Greg KH wrote:
> > On Tue, Jul 15, 2003 at 06:29:48PM -0700, Mike Fedyk wrote:
> > > Here's a nice oops for you guys.
> > >
> > > Hotplug is the trigger. I can't reproduce without hotplug.
> > >
> > > hotplug tries to load ohci, ehci, and finally uhci (the correct module), it
> > > oopses for each driver with hotplug, but if I try without hotplug ('apt-get
> > > remove hotplug' before rebooting), I can load all three usb drivers with no
> > > oops.
> >
> > If you just load these drivers by hand, does the oops happen?
> >
>
> I didn't look into the hotplug scripts to see which hotplug modules (and
> they are modules for me) were being loaded and in which order.
It should just do:
modprobe -q ehci-hcd >/dev/null 2>&1
modprobe -q ohci-hcd >/dev/null 2>&1
modprobe -q uhci-hcd >/dev/null 2>&1
That's what the latest hotplug package has in it. I don't know what
Debian has lately...
> I did load the usb drivers by hand with no oops though.
That's really strange.
> > Can you enable debugging in the kobject code, or the driver base code to
> > try to get some better debug messages of what is going on?
> >
>
> Please tell me which file that's in, and what I need to change, or give a
> patch.
Here's a patch that I always run with. It is pretty verbose, but helps
me out a lot in debugging and development.
Let us know if it shows anything interesting.
thanks,
greg k-h
diff -Nru a/drivers/base/bus.c b/drivers/base/bus.c
--- a/drivers/base/bus.c Tue Jul 15 19:23:44 2003
+++ b/drivers/base/bus.c Tue Jul 15 19:23:44 2003
@@ -8,7 +8,7 @@
*
*/
-#undef DEBUG
+#define DEBUG 1
#include <linux/device.h>
#include <linux/module.h>
diff -Nru a/drivers/base/class.c b/drivers/base/class.c
--- a/drivers/base/class.c Tue Jul 15 19:24:11 2003
+++ b/drivers/base/class.c Tue Jul 15 19:24:11 2003
@@ -10,7 +10,7 @@
*
*/
-#undef DEBUG
+#define DEBUG 1
#include <linux/device.h>
#include <linux/module.h>
diff -Nru a/drivers/base/core.c b/drivers/base/core.c
--- a/drivers/base/core.c Tue Jul 15 19:23:45 2003
+++ b/drivers/base/core.c Tue Jul 15 19:23:45 2003
@@ -8,7 +8,7 @@
*
*/
-#undef DEBUG
+#define DEBUG 1
#include <linux/device.h>
#include <linux/err.h>
diff -Nru a/drivers/base/driver.c b/drivers/base/driver.c
--- a/drivers/base/driver.c Tue Jul 15 19:24:11 2003
+++ b/drivers/base/driver.c Tue Jul 15 19:24:11 2003
@@ -8,7 +8,7 @@
*
*/
-#undef DEBUG
+#define DEBUG 1
#include <linux/device.h>
#include <linux/module.h>
diff -Nru a/include/linux/usb.h b/include/linux/usb.h
diff -Nru a/lib/kobject.c b/lib/kobject.c
--- a/lib/kobject.c Tue Jul 15 19:23:44 2003
+++ b/lib/kobject.c Tue Jul 15 19:23:44 2003
@@ -10,7 +10,7 @@
* about using the kobject interface.
*/
-#undef DEBUG
+#define DEBUG
#include <linux/kobject.h>
#include <linux/string.h>
@@ -213,6 +213,7 @@
void kobject_init(struct kobject * kobj)
{
+ WARN_ON(atomic_read(&kobj->refcount));
atomic_set(&kobj->refcount,1);
INIT_LIST_HEAD(&kobj->entry);
kobj->kset = kset_get(kobj->kset);
@@ -379,6 +380,7 @@
atomic_inc(&kobj->refcount);
} else
ret = NULL;
+ WARN_ON((kobj != NULL) && (ret==NULL));
return ret;
}
-
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This archive was generated by hypermail 2b29 : Tue Jul 15 2003 - 22:01:01 EST