patch "usb: ehci: change order of register cleanup during shutdown" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: ehci: change order of register cleanup during shutdown

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Marc Ohlf <[email protected]>
Date: Wed, 3 Aug 2016 11:51:54 +0200
Subject: 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.

---
 drivers/usb/host/ehci-hcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index a962b89b65a6..1e5f529d51a2 100644
@@ -332,11 +332,11 @@ static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 	int	port = HCS_N_PORTS(ehci->hcs_params);
 
 	while (port--) {
-		ehci_writel(ehci, PORT_RWC_BITS,
-				&ehci->regs->port_status[port]);
 		spin_unlock_irq(&ehci->lock);
 		ehci_port_power(ehci, port, false);
 		spin_lock_irq(&ehci->lock);
+		ehci_writel(ehci, PORT_RWC_BITS,
+				&ehci->regs->port_status[port]);
 	}
 }
 

2.9.2