linux-kernel - [PATCH 5/6] USB: dummy-hcd: Add missing annotation for set_link

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Message-Id: <20200429100529.19645-6-jbi.octave@gmail.com>
Date:   Wed, 29 Apr 2020 11:05:27 +0100
From:   Jules Irenge <jbi.octave@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        "Jacky.Cao@...y.com" <Jacky.Cao@...y.com>,
        linux-usb@...r.kernel.org (open list:USB GADGET/PERIPHERAL SUBSYSTEM)
Subject: [PATCH 5/6] USB: dummy-hcd: Add missing annotation for set_link_state()

Sparse reports a warning at set_link_state()

warning: context imbalance in set_link_state() - unexpected unlock

The root cause is the missing annotation at set_link_state()
Add the missing __must_hold(&dum->lock)

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
---
 drivers/usb/gadget/udc/dummy_hcd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 4c9d1e49d5ed..c07ddf11e137 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -427,6 +427,7 @@ static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
 
 /* caller must hold lock */
 static void set_link_state(struct dummy_hcd *dum_hcd)
+	__must_hold(&dum->lock)
 {
 	struct dummy *dum = dum_hcd->dum;
 	unsigned int power_bit;
-- 
2.25.3