On Tue, 7 Jul 2009, Ramya Desai wrote: > I wanted my driver to make asynchronous calls to the device (USB > attached SCSI). To get this I am issuing commands from callback > context. Is there any alternate call to usb_sg_wait(), that can be > called from callback context. There are alternatives, but none of them are able to handle scatter-gather lists. > If there is no alternate call, do I need > to change my driver design? It's kind of hard to answer this without knowing what your driver design is. > Because if the driver is blocked waiting on the scatter gather > transfer by calling usb_sg_wait() from driver context, it can't queue > any other command. Will this lead to spawn a kernel thread or a work > queue or something, so that each instance can call usb_sg_init() and > usb_sg_wait()? That would be one possible approach. Alan Stern -- 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
