linux-kernel - [PATCH v2 4/6] soundwire: sysfs: have the driver core handle the creation of the device groups

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Date:   Wed, 24 Aug 2022 15:59:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     alsa-devel@...a-project.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/6] soundwire: sysfs: have the driver core handle the creation of the device groups

The driver core supports the ability to handle the creation and removal
of device-specific sysfs files in a race-free manner.  Take advantage of
that by converting this driver to use this by moving the sysfs
attributes into a group and assigning the dev_groups pointer to it.

Cc: Vinod Koul <vkoul@...nel.org>
Cc: Bard Liao <yung-chuan.liao@...ux.intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc: Sanyog Kale <sanyog.r.kale@...el.com>
Cc: alsa-devel@...a-project.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
v2: rebased on 6.0-rc1

 drivers/soundwire/bus_type.c    | 1 +
 drivers/soundwire/sysfs_local.h | 3 +++
 drivers/soundwire/sysfs_slave.c | 6 +-----
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/soundwire/bus_type.c b/drivers/soundwire/bus_type.c
index 04b3529f8929..397fe9179369 100644
--- a/drivers/soundwire/bus_type.c
+++ b/drivers/soundwire/bus_type.c
@@ -215,6 +215,7 @@ int __sdw_register_driver(struct sdw_driver *drv, struct module *owner)
 	drv->driver.probe = sdw_drv_probe;
 	drv->driver.remove = sdw_drv_remove;
 	drv->driver.shutdown = sdw_drv_shutdown;
+	drv->driver.dev_groups = sdw_attr_groups;
 
 	return driver_register(&drv->driver);
 }
diff --git a/drivers/soundwire/sysfs_local.h b/drivers/soundwire/sysfs_local.h
index 7268bc24c538..3ab8658a7782 100644
--- a/drivers/soundwire/sysfs_local.h
+++ b/drivers/soundwire/sysfs_local.h
@@ -11,6 +11,9 @@
 /* basic attributes to report status of Slave (attachment, dev_num) */
 extern const struct attribute_group *sdw_slave_status_attr_groups[];
 
+/* attributes for all soundwire devices */
+extern const struct attribute_group *sdw_attr_groups[];
+
 /* additional device-managed properties reported after driver probe */
 int sdw_slave_sysfs_init(struct sdw_slave *slave);
 int sdw_slave_sysfs_dpn_init(struct sdw_slave *slave);
diff --git a/drivers/soundwire/sysfs_slave.c b/drivers/soundwire/sysfs_slave.c
index 3723333a5c2b..4c716c167493 100644
--- a/drivers/soundwire/sysfs_slave.c
+++ b/drivers/soundwire/sysfs_slave.c
@@ -204,7 +204,7 @@ static const struct attribute_group dp0_group = {
 	.name = "dp0",
 };
 
-static const struct attribute_group *slave_groups[] = {
+const struct attribute_group *sdw_attr_groups[] = {
 	&slave_attr_group,
 	&sdw_slave_dev_attr_group,
 	&dp0_group,
@@ -215,10 +215,6 @@ int sdw_slave_sysfs_init(struct sdw_slave *slave)
 {
 	int ret;
 
-	ret = devm_device_add_groups(&slave->dev, slave_groups);
-	if (ret < 0)
-		return ret;
-
 	if (slave->prop.source_ports || slave->prop.sink_ports) {
 		ret = sdw_slave_sysfs_dpn_init(slave);
 		if (ret < 0)
-- 
2.37.2