linux-kernel - [PATCH v4 6/7] i2c: designware: Use runtime PM macro for auto-cleanup

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Message-Id: <20251126-i2c-dw-v4-6-b0654598e7c5@bootlin.com>
Date: Wed, 26 Nov 2025 11:46:29 +0100
From: Benoît Monin <benoit.monin@...tlin.com>
To: Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Jarkko Nikula <jarkko.nikula@...ux.intel.com>, 
 Mika Westerberg <mika.westerberg@...ux.intel.com>, 
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 Jan Dabros <jsd@...ihalf.com>, 
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
 Clark Williams <clrkwllms@...nel.org>, Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Gregory CLEMENT <gregory.clement@...tlin.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>, 
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, 
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Dmitry Guzman <dmitry.guzman@...ileye.com>, linux-i2c@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-rt-devel@...ts.linux.dev, 
 Benoît Monin <benoit.monin@...tlin.com>
Subject: [PATCH v4 6/7] i2c: designware: Use runtime PM macro for
 auto-cleanup

Simplify runtime PM handling in i2c_dw_xfer() by using the
pm_runtime_active_auto_try guard. This adds the proper handling for
runtime PM resume errors and allows us to get rid of the done and
done_nolock labels.

Signed-off-by: Benoît Monin <benoit.monin@...tlin.com>
---
 drivers/i2c/busses/i2c-designware-master.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index f3c87f447dd5..907597c7a05c 100644
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -905,11 +905,13 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 
 	dev_dbg(dev->dev, "msgs: %d\n", num);
 
-	pm_runtime_get_sync(dev->dev);
+	ACQUIRE(pm_runtime_active_auto_try, pm)(dev->dev);
+	if (ACQUIRE_ERR(pm_runtime_active_auto_try, &pm))
+		return -ENXIO;
 
 	ret = i2c_dw_acquire_lock(dev);
 	if (ret)
-		goto done_nolock;
+		return ret;
 
 	/*
 	 * If the I2C_M_STOP is present in some the messages,
@@ -923,13 +925,15 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 		for (cnt = 1; ; cnt++) {
 			if (!i2c_dw_msg_is_valid(dev, msgs_part, cnt - 1)) {
 				ret = -EINVAL;
-				goto done;
+				break;
 			}
 
 			if ((msgs_part[cnt - 1].flags & I2C_M_STOP) ||
 			    (msgs_part + cnt == msgs + num))
 				break;
 		}
+		if (ret < 0)
+			break;
 
 		/* transfer one part up to a STOP */
 		ret = __i2c_dw_xfer_one_part(dev, msgs_part, cnt);
@@ -937,12 +941,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 			break;
 	}
 
-done:
 	i2c_dw_release_lock(dev);
 
-done_nolock:
-	pm_runtime_put_autosuspend(dev->dev);
-
 	if (ret < 0)
 		return ret;
 	return num;

-- 
2.52.0