linux-kernel - [PATCH 1/2] soundwire: bus: Simplify sdw_assign_device

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Message-Id: <20250422104245.958678-2-ckeepax@opensource.cirrus.com>
Date: Tue, 22 Apr 2025 11:42:44 +0100
From: Charles Keepax <ckeepax@...nsource.cirrus.com>
To: vkoul@...nel.org
Cc: yung-chuan.liao@...ux.intel.com, pierre-louis.bossart@...ux.dev,
        sanyog.r.kale@...el.com, linux-sound@...r.kernel.org,
        linux-kernel@...r.kernel.org, patches@...nsource.cirrus.com
Subject: [PATCH 1/2] soundwire: bus: Simplify sdw_assign_device_num()

Simplify the code in sdw_assign_device_num(). Remove the new_device
flag which can be simply handled inline and do a bit less shuffling of
dev_num in and out of various variables. This patch should cause no
functional changes.

Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 drivers/soundwire/bus.c | 29 ++++++++++++-----------------
 1 file changed, 12 insertions(+), 17 deletions(-)

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index 39aecd34c641..3f1d8ff55022 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -751,41 +751,36 @@ static int sdw_get_device_num(struct sdw_slave *slave)
 static int sdw_assign_device_num(struct sdw_slave *slave)
 {
 	struct sdw_bus *bus = slave->bus;
-	int ret, dev_num;
-	bool new_device = false;
+	struct device *dev = bus->dev;
+	int ret;
 
 	/* check first if device number is assigned, if so reuse that */
 	if (!slave->dev_num) {
 		if (!slave->dev_num_sticky) {
+			int dev_num;
+
 			mutex_lock(&slave->bus->bus_lock);
 			dev_num = sdw_get_device_num(slave);
 			mutex_unlock(&slave->bus->bus_lock);
 			if (dev_num < 0) {
-				dev_err(bus->dev, "Get dev_num failed: %d\n",
-					dev_num);
+				dev_err(dev, "Get dev_num failed: %d\n", dev_num);
 				return dev_num;
 			}
-			slave->dev_num = dev_num;
+
 			slave->dev_num_sticky = dev_num;
-			new_device = true;
 		} else {
-			slave->dev_num = slave->dev_num_sticky;
+			dev_dbg(dev, "Slave already registered, reusing dev_num: %d\n",
+				slave->dev_num_sticky);
 		}
 	}
 
-	if (!new_device)
-		dev_dbg(bus->dev,
-			"Slave already registered, reusing dev_num:%d\n",
-			slave->dev_num);
-
 	/* Clear the slave->dev_num to transfer message on device 0 */
-	dev_num = slave->dev_num;
 	slave->dev_num = 0;
 
-	ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, dev_num);
+	ret = sdw_write_no_pm(slave, SDW_SCP_DEVNUMBER, slave->dev_num_sticky);
 	if (ret < 0) {
-		dev_err(bus->dev, "Program device_num %d failed: %d\n",
-			dev_num, ret);
+		dev_err(dev, "Program device_num %d failed: %d\n",
+			slave->dev_num_sticky, ret);
 		return ret;
 	}
 
@@ -793,7 +788,7 @@ static int sdw_assign_device_num(struct sdw_slave *slave)
 	slave->dev_num = slave->dev_num_sticky;
 
 	if (bus->ops && bus->ops->new_peripheral_assigned)
-		bus->ops->new_peripheral_assigned(bus, slave, dev_num);
+		bus->ops->new_peripheral_assigned(bus, slave, slave->dev_num);
 
 	return 0;
 }
-- 
2.39.5