Re: Can't unload uhci_hcd module with 2.6.22 -- also oops

On Tue, 31 Jul 2007, Oliver Neukum wrote:

> Am Dienstag 31 Juli 2007 schrieb A. Kalten:
> > On Tue, 31 Jul 2007 13:00:38 -0400
> > "A. Kalten" <[email protected]> wrote:
> > > 
> > > But after compiling 2.6.23-rc1 and undergoing the same steps
> > > with the usb modem as before, the problem remains.  The only
> > > difference is that the command "rmmod uhci-hcd" now reports
> > > the message "Killed" instead of "Device busy."
> > > 
> > 
> > For whatever it's worth.I should point out that this problem
> > only occurs when using the USB Abstract Control Model driver
> > for USB modems (i.e. the cdc_acm module).  When using my
> > USB scanner or USB printer I can unload the uhci-hcd module
> > without any problem using the equivalent procedure.
> 
> acm uses two interfaces for one driver which is pretty rare and explains
> that a refcounting problem is not seen with other drivers.

But shouldn't the same problem affect other people?

Here's a diagnotic patch to try under 2.6.22.  It should add some
interesting information to the kernel log, starting from the point
where the modem gets plugged in.

Alan Stern



Index: 2.6.22/drivers/usb/core/sysfs.c
===================================================================
--- 2.6.22.orig/drivers/usb/core/sysfs.c
+++ 2.6.22/drivers/usb/core/sysfs.c
@@ -530,6 +530,7 @@ int usb_create_sysfs_intf_files(struct u
 	struct usb_host_interface *alt = intf->cur_altsetting;
 	int retval;
 
+	dev_info(dev, "Create sysfs intf files\n");
 	retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
 	if (retval)
 		return retval;
@@ -546,6 +547,7 @@ void usb_remove_sysfs_intf_files(struct 
 {
 	struct device *dev = &intf->dev;
 
+	dev_info(dev, "Remove sysfs intf files\n");
 	usb_remove_intf_ep_files(intf);
 	device_remove_file(dev, &dev_attr_interface);
 	sysfs_remove_group(&dev->kobj, &intf_attr_grp);


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