Hi Sarah, This is the patchset for xHCI dynamic ring expansion. When room_on_ring() check fails, try to expand the ring with double segment numbers. It's achieved by either finding a cached ring or allocating a new ring with the same number of sgements as the old ring, then link the old ring to the new ring. It fixes the "ERROR: no room on ring" error unless the driver askes for a ring with more than 256 segments. It's tested with an isoc device which requires at least 32 segments. The patchset is based on AMD isoc link TRB quirk patch. Thanks, Andiry --- Andiry Xu (3): xHCI: store ring's last segment and segment numbers xHCI: set cycle state when allocate rings xHCI: dynamic ring expansion drivers/usb/host/xhci-mem.c | 132 +++++++++++++++++++++++++++++++++++------- drivers/usb/host/xhci-ring.c | 38 +++++++++---- drivers/usb/host/xhci.h | 5 ++ 3 files changed, 142 insertions(+), 33 deletions(-) -- 1.7.4.1 -- 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
