bfa3dbb343f664573292afb9e44f9abeb81a19de — Samuel Holland 1 year, 5 days ago 18b7406
usb: xhci: fix Immediate Data Transfer endianness

The arguments to queue_trb are always byteswapped to LE for placement in
the ring, but this should not happen in the case of immediate data; the
bytes copied out of transfer_buffer are already in the correct order.
Add a complementary byteswap so the bytes end up in the ring correctly.

This was observed on BE ppc64 with a "Texas Instruments TUSB73x0
SuperSpeed USB 3.0 xHCI Host Controller [104c:8241]" as a ch341
usb-serial adapter ("1a86:7523 QinHeng Electronics HL-340 USB-Serial
adapter") always transmitting the same character (generally NUL) over
the serial link regardless of the key pressed.

Cc: <stable@vger.kernel.org> # 5.2+
Fixes: 33e39350ebd2 ("usb: xhci: add Immediate Data Transfer support")
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1572013829-14044-3-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 2 insertions(+), 0 deletions(-)

M drivers/usb/host/xhci-ring.c
M drivers/usb/host/xhci-ring.c => drivers/usb/host/xhci-ring.c +2 -0
@@ 3330,6 3330,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
			if (xhci_urb_suitable_for_idt(urb)) {
				memcpy(&send_addr, urb->transfer_buffer,
				field |= TRB_IDT;

@@ 3475,6 3476,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
		if (xhci_urb_suitable_for_idt(urb)) {
			memcpy(&addr, urb->transfer_buffer,
			field |= TRB_IDT;
		} else {
			addr = (u64) urb->transfer_dma;