linux-kernel - [PATCH 4.14 199/246] usb: hub: Dont wait for connect state at resume for powered-off ports

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Message-Id: <20180801165021.240728802@linuxfoundation.org>
Date:   Wed,  1 Aug 2018 18:51:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dominik Bozek <dominikx.bozek@...el.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 199/246] usb: hub: Dont wait for connect state at resume for powered-off ports

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dominik Bozek <dominikx.bozek@...el.com>

[ Upstream commit 5d111f5190848d6fb1c414dc57797efea3526a2f ]

wait_for_connected() wait till a port change status to
USB_PORT_STAT_CONNECTION, but this is not possible if
the port is unpowered. The loop will only exit at timeout.

Such case take place if an over-current incident happen
while system is in S3. Then during resume wait_for_connected()
will wait 2s, which may be noticeable by the user.

Signed-off-by: Dominik Bozek <dominikx.bozek@...el.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/core/hub.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3361,6 +3361,10 @@ static int wait_for_connected(struct usb
 	while (delay_ms < 2000) {
 		if (status || *portstatus & USB_PORT_STAT_CONNECTION)
 			break;
+		if (!port_is_power_on(hub, *portstatus)) {
+			status = -ENODEV;
+			break;
+		}
 		msleep(20);
 		delay_ms += 20;
 		status = hub_port_status(hub, *port1, portstatus, portchange);