tree e3cb2492951b8cccd32f1872617a30cbf6a4b51c
parent aed9d65ac3278d4febd8665bd7db59ef53e825fe
author Marc Ohlf <ohlf@mkt-sys.de> 1470217914 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1470752058 +0200

usb: ehci: change order of register cleanup during shutdown

In ehci_turn_off_all_ports() all EHCI port registers are cleared to zero.
On some hardware, this can lead to an system hang,
when ehci_port_power() accesses the already cleared registers.

This patch changes the order of cleanup.
First call ehci_port_power() which respects the current bits in
port status registers
and afterwards cleanup the hard way by setting everything to zero.

Signed-off-by: Marc Ohlf <ohlf@mkt-sys.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>