4.17-stable review patch. If anyone has any objections, please let me know.
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From: Dominik Bozek dominikx.bozek@intel.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@intel.com Signed-off-by: Kuppuswamy Sathyanarayanan sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/core/hub.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3380,6 +3380,10 @@ 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);