> which happens when the driver's internal buffer is temporarily full. > I would have expected that the TTY layer or the libc implementation of > printf would requery write_room automatically and thus would notice How is it going to magically notice ? > after a while that there is space again, but this doesn't seem to happen. > Eventually the printf function returns after a very long timeout but without > that the remaining characters have been printed. You need to wake it up and tell it there is room in your completion interrupts. It will then think about retrying. > I based my code mainly on the ifx6x60-driver and I looked at other similar > drivers as well, but I can't see that they are using a different strategy. > > In a dated driver book it was suggested that write_room and write should > always return at least one. I would suggest recycling that book 8) Alan -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
