usb: musb: fix tx fifo flush handling again
authorBin Liu <b-liu@ti.com>
Tue, 25 Jul 2017 14:31:34 +0000 (09:31 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 30 Jul 2017 14:18:27 +0000 (07:18 -0700)
commit45d73860530a14c608f410b91c6c341777bfa85d
tree060cf202b9eeba0b9c5181144f0801e9aa02d9ab
parent2eac13624364db5b5e1666ae0bb3a4d36bc56b6e
usb: musb: fix tx fifo flush handling again

commit 68fe05e2a451 ("usb: musb: fix tx fifo flush handling") drops the
1ms delay trying to solve the long disconnect time issue when
application queued many tx urbs. However, the 1ms delay is needed for
some use cases, for example, without the delay, reconnecting AR9271 WIFI
dongle no longer works if the connection is dropped from the AP.

So let's add back the 1ms delay in musb_h_tx_flush_fifo(), and solve the
long disconnect time problem with a separate patch for
usb_hcd_flush_endpoint().

Cc: stable@vger.kernel.org # v4.4+
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/musb/musb_host.c