Hi I am trying to develop a linux kernel driver for a USB device and I am initially following the example driver usb-skeleton.c and also the driver usblcd.c The sequence: in the file operation ..write(): usb_alloc_urb() usb_buffer_alloc(a big buffer) usb_fill_bulk_urb(for an OUT pipe) usb_submit_urb() usb_free_urb() then in the completion ..callback(): usb_buffer_free() the routine dma_free_coherent() is called which calls WARN_ON(irqs_disabled) and because I am running the kernel with all the debugs and warnings switched on I get a stack dump in the system log. Because I do not want to see warnings unless I am doing something wrong I have to investigate the (possible) problem. As far as I can tell the WARN_ON() is completely spurious. Is that correct?? If so what is the solution and who will change the drivers that use the same algorithm?? Many thanks, Tony Olech Elan Digital Systems Ltd -- 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
