linux-kernel - [PATCH -next] usb: musb: fix PM reference leak in musb_irq

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Date:   Thu, 8 Apr 2021 17:18:36 +0800
From:   Bixuan Cui <cuibixuan@...wei.com>
To:     <b-liu@...com>, <gregkh@...uxfoundation.org>
CC:     <john.wanghui@...wei.com>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH -next] usb: musb: fix PM reference leak in musb_irq_work()

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/musb/musb_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index fc0457db62e1..8f09a387b773 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2070,7 +2070,7 @@ static void musb_irq_work(struct work_struct *data)
 	struct musb *musb = container_of(data, struct musb, irq_work.work);
 	int error;
 
-	error = pm_runtime_get_sync(musb->controller);
+	error = pm_runtime_resume_and_get(musb->controller);
 	if (error < 0) {
 		dev_err(musb->controller, "Could not enable: %i\n", error);