xhci: really enqueue zero length TRBs.
Enqueue the first TRB even if full_len is zero.
Without this "adb install <apk>" freezes the system.
Signed-off-by: Alban Browaeys <alban.browaeys@gmail.com>
Fixes: 86065c2719a5 ("xhci: don't rely on precalculated value of needed trbs in the enqueue loop")
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index fe5b70b..fd9fd12 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3244,7 +3244,8 @@
send_addr = addr;
/* Queue the TRBs, even if they are zero-length */
- for (enqd_len = 0; enqd_len < full_len; enqd_len += trb_buff_len) {
+ for (enqd_len = 0; first_trb || enqd_len < full_len;
+ enqd_len += trb_buff_len) {
field = TRB_TYPE(TRB_NORMAL);
/* TRB buffer should not cross 64KB boundaries */