linux-kernel - [PATCH 11/11] pinctrl: st: Annotate st_pinconf_dbg

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Message-Id: <20260114-pinctrl-cleanup-guard-v1-11-a14572685cd3@oss.qualcomm.com>
Date: Wed, 14 Jan 2026 16:30:12 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
To: Andrew Jeffery <andrew@...econstruct.com.au>,
        Linus Walleij <linusw@...nel.org>, Joel Stanley <joel@....id.au>,
        Emil Renner Berthing <kernel@...il.dk>,
        Hal Feng <hal.feng@...rfivetech.com>,
        Chen Wang <unicorn_wang@...look.com>,
        Inochi Amaoto <inochiama@...il.com>,
        Basavaraj Natikar <Basavaraj.Natikar@....com>,
        Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Bartosz Golaszewski <brgl@...nel.org>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        Daniel Machon <daniel.machon@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Patrice Chotard <patrice.chotard@...s.st.com>
Cc: linux-aspeed@...ts.ozlabs.org, openbmc@...ts.ozlabs.org,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, sophgo@...ts.linux.dev,
        linux-tegra@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH 11/11] pinctrl: st: Annotate st_pinconf_dbg_show() as
 holding mutex

st_pinconf_dbg_show() unlocks and locks the pinctrl_dev mutex, so it
must be called by the pinctrl core with the mutex hold.  Annotate the
function with sparse __must_hold, so any changes in pinctrl locking will
be statically detected.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>

---

I think this is still useful, although maybe a bit pointless if core
explicitly always locks every pin_config_dbg_show() call? Anyway,
pattern of unlock+lock feels to me like something worth annotating.

I left the patch at the end of the set so it can be nicely discarded.
---
 drivers/pinctrl/pinctrl-st.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index d3cea3437d7f..8ce88e591f47 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -987,6 +987,7 @@ static int st_pinconf_get(struct pinctrl_dev *pctldev,
 
 static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 				   struct seq_file *s, unsigned pin_id)
+	__must_hold(&pctldev->mutex)
 {
 	struct st_pio_control *pc;
 	unsigned long config;

-- 
2.51.0