linux-kernel - [PATCH] usb: core: hub: Fix PM reference leak in usb_port

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Date:   Thu, 8 Apr 2021 21:08:31 +0800
From:   Bixuan Cui <cuibixuan@...wei.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <john.wanghui@...wei.com>, <linux-usb@...r.kernel.org>,
        <gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>,
        <gustavoars@...nel.org>, <oneukum@...e.com>,
        <erosca@...adit-jv.com>, "Bixuan Cui" <cuibixuan@...wei.com>
Subject: [PATCH] usb: core: hub: Fix PM reference leak in usb_port_resume()

pm_runtime_get_sync will increment pm usage counter even it failed.
thus a pairing decrement is needed.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Bixuan Cui <cuibixuan@...wei.com>
---
 drivers/usb/core/hub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 9a83390072da..b2bc4b7c4289 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3605,7 +3605,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 	u16		portchange, portstatus;
 
 	if (!test_and_set_bit(port1, hub->child_usage_bits)) {
-		status = pm_runtime_get_sync(&port_dev->dev);
+		status = pm_runtime_resume_and_get(&port_dev->dev);
 		if (status < 0) {
 			dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
 					status);
-- 
2.17.1