Hi, Ming Lei made me look. I found a scenario I don't like. Suppose we have a device with two interfaces #1 and #0 Let #1 be storage and #0 be vendor specific and the skeleton driver bound to it. CPU A CPU B skel_read() mutex_lock_interruptible(&dev->io_mutex) copy_to_user(...) page fault schedule reading a page from interface #0 usb_stor_port_reset() usb_reset_device() drv->pre_reset() skel_pre_reset() mutex_lock(&dev->io_mutex) Contrary to the usual scenario you don't need writable mmap. In fact it could happen with a scratched CD. What do you think? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
