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USB: Verify the port status when timeout happens during port suspend

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On the Realtek high-speed Hub(0bda:5487), the port which has wakeup
enabled_descendants will sometimes timeout when setting PORT_SUSPEND
feature. After checking the PORT_SUSPEND bit in wPortStatus, it is
already set which means the port has been suspended. We should treat
it suspended to make sure it will be resumed correctly.

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chris Chiu <chris.chiu@canonical.com>
Link: https://lore.kernel.org/r/20210514045405.5261-2-chris.chiu@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Chiu 2021-05-14 12:54:04 +08:00 committed by Greg Kroah-Hartman
parent 106133dacc
commit 7142452387
1 changed files with 21 additions and 0 deletions
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21
drivers/usb/core/hub.c
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@ -3385,6 +3385,26 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
status = 0;
}
if (status) {
/* Check if the port has been suspended for the timeout case
* to prevent the suspended port from incorrect handling.
*/
if (status == -ETIMEDOUT) {
int ret;
u16 portstatus, portchange;
portstatus = portchange = 0;
ret = hub_port_status(hub, port1, &portstatus,
&portchange);
dev_dbg(&port_dev->dev,
"suspend timeout, status %04x\n", portstatus);
if (ret == 0 && port_is_suspended(hub, portstatus)) {
status = 0;
goto suspend_done;
}
}
dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status);
/* Try to enable USB3 LTM again */
@ -3401,6 +3421,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
if (!PMSG_IS_AUTO(msg))
status = 0;
} else {
suspend_done:
dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n",
(PMSG_IS_AUTO(msg) ? "auto-" : ""),
udev->do_remote_wakeup);