linux-kernel - Re: [PATCH v2] xhci: fix runtime PM imbalance in USB2 resume

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Date:   Sat, 26 Feb 2022 16:06:51 +0000
From:   Henry Lin <henryl@...dia.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] xhci: fix runtime PM imbalance in USB2 resume

USB2 resume starts with usb_hcd_start_port_resume() in port status
change handling for RESUME link state. usb_hcd_end_port_resume() call is
needed to keep runtime PM balance.

Fixes: a231ec41e6f6 ("xhci: refactor U0 link state handling in get_port_status")
Signed-off-by: Henry Lin <henryl@...dia.com>
---
V1 -> V2: Added Fixes tag in changelog

 drivers/usb/host/xhci-hub.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index df3522dab31b..4a8b07b8ee01 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1090,6 +1090,8 @@ static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
                 if (link_state == XDEV_U0) {
                         bus_state->resume_done[portnum] = 0;
                         clear_bit(portnum, &bus_state->resuming_ports);
+                       usb_hcd_end_port_resume(&port->rhub->hcd->self,
+                                               portnum);
                         if (bus_state->suspended_ports & (1 << portnum)) {
                                 bus_state->suspended_ports &= ~(1 << portnum);
                                 bus_state->port_c_suspend |= 1 << portnum;
--
2.17.1