Hi,
in addition to the issues noted with alphatrack.c, tranzport.c has
an additional problem:
/**
* usb_tranzport_disconnect
*
* Called by the usb core when the device is removed from the system.
*/
static void usb_tranzport_disconnect(struct usb_interface *intf)
{
struct usb_tranzport *dev;
int minor;
mutex_lock(&disconnect_mutex);
dev = usb_get_intfdata(intf);
usb_set_intfdata(intf, NULL);
If read/write through sysfs races this, you'll oops.
In disconnect you first must call device_remove_file() for every attribute.
Regards
Oliver
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