[PATCH v1 1/1] usb: hub: Don't wait for connect state at resume for powered-off ports

From: sathyanarayanan . kuppuswamy
Date: Fri Apr 13 2018 - 13:43:05 EST


From: Dominik Bozek <dominikx.bozek@xxxxxxxxx>

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@xxxxxxxxx>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c5c1f6c..bd2b136 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3367,6 +3367,10 @@ static int wait_for_connected(struct usb_device *udev,
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);
--
2.7.4