linux-kernel - [PATCH] watchdog: starfive: add lock annotations to fix context imbalances

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Date:   Wed, 22 Nov 2023 08:51:18 +0000
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     linux-watchdog@...r.kernel.org
Cc:     linux@...ck-us.net, wim@...ux-watchdog.org,
        samin.guo@...rfivetech.com, xingyu.wu@...rfivetech.com,
        linux-kernel@...r.kernel.org, Ben Dooks <ben.dooks@...ethink.co.uk>
Subject: [PATCH] watchdog: starfive: add lock annotations to fix context imbalances

Add the necessary __acquires() and __releases() to the functions
that take and release the wdt lock to avoid the following sparse
warnings:

drivers/watchdog/starfive-wdt.c:204:13: warning: context imbalance in 'starfive_wdt_unlock' - wrong count at exit
drivers/watchdog/starfive-wdt.c:212:9: warning: context imbalance in 'starfive_wdt_lock' - unexpected unlock

Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>
---
 drivers/watchdog/starfive-wdt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/watchdog/starfive-wdt.c b/drivers/watchdog/starfive-wdt.c
index 5f501b41faf9..49b38ecc092d 100644
--- a/drivers/watchdog/starfive-wdt.c
+++ b/drivers/watchdog/starfive-wdt.c
@@ -202,12 +202,14 @@ static u32 starfive_wdt_ticks_to_sec(struct starfive_wdt *wdt, u32 ticks)
 
 /* Write unlock-key to unlock. Write other value to lock. */
 static void starfive_wdt_unlock(struct starfive_wdt *wdt)
+	__acquires(&wdt->lock)
 {
 	spin_lock(&wdt->lock);
 	writel(wdt->variant->unlock_key, wdt->base + wdt->variant->unlock);
 }
 
 static void starfive_wdt_lock(struct starfive_wdt *wdt)
+	__releases(&wdt->lock)
 {
 	writel(~wdt->variant->unlock_key, wdt->base + wdt->variant->unlock);
 	spin_unlock(&wdt->lock);
-- 
2.37.2.352.g3c44437643