linux-kernel - [PATCH v1 1/1] ACPI: bus: Introduce acpi_dev

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Date:   Sat, 10 Apr 2021 16:47:18 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dwaipayan Ray <dwaipayanray1@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...ica.org
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>
Subject: [PATCH v1 1/1] ACPI: bus: Introduce acpi_dev_get() and reuse it in ACPI code

Introduce acpi_dev_get() to have a symmetrical API with acpi_dev_put()
and reuse both in ACPI code under drivers/acpi folder.

While at it, use acpi_bus_put_acpi_device() in one place rather than above.

Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/acpi/device_sysfs.c | 4 ++--
 drivers/acpi/glue.c         | 8 ++++----
 drivers/acpi/scan.c         | 9 ++++-----
 include/acpi/acpi_bus.h     | 6 ++++++
 4 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
index da4ff2a8b06a..35757c3c1b71 100644
--- a/drivers/acpi/device_sysfs.c
+++ b/drivers/acpi/device_sysfs.c
@@ -376,12 +376,12 @@ eject_store(struct device *d, struct device_attribute *attr,
 	if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
 		return -ENODEV;
 
-	get_device(&acpi_device->dev);
+	acpi_dev_get(acpi_device);
 	status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT);
 	if (ACPI_SUCCESS(status))
 		return count;
 
-	put_device(&acpi_device->dev);
+	acpi_dev_put(acpi_device);
 	acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT,
 			  ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
 	return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
index 36b24b0658cb..0715e3be99a0 100644
--- a/drivers/acpi/glue.c
+++ b/drivers/acpi/glue.c
@@ -190,7 +190,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
 	if (!acpi_dev)
 		return -EINVAL;
 
-	get_device(&acpi_dev->dev);
+	acpi_dev_get(acpi_dev);
 	get_device(dev);
 	physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
 	if (!physical_node) {
@@ -217,7 +217,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
 				goto err;
 
 			put_device(dev);
-			put_device(&acpi_dev->dev);
+			acpi_dev_put(acpi_dev);
 			return 0;
 		}
 		if (pn->node_id == node_id) {
@@ -257,7 +257,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
  err:
 	ACPI_COMPANION_SET(dev, NULL);
 	put_device(dev);
-	put_device(&acpi_dev->dev);
+	acpi_dev_put(acpi_dev);
 	return retval;
 }
 EXPORT_SYMBOL_GPL(acpi_bind_one);
@@ -285,7 +285,7 @@ int acpi_unbind_one(struct device *dev)
 			ACPI_COMPANION_SET(dev, NULL);
 			/* Drop references taken by acpi_bind_one(). */
 			put_device(dev);
-			put_device(&acpi_dev->dev);
+			acpi_dev_put(acpi_dev);
 			kfree(entry);
 			break;
 		}
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ad2541c0aece..bba6b529cf6c 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -530,7 +530,7 @@ static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 		 * used by the device.
 		 */
 		acpi_power_transition(adev, ACPI_STATE_D3_COLD);
-		put_device(&adev->dev);
+		acpi_dev_put(adev);
 	}
 }
 
@@ -604,8 +604,7 @@ EXPORT_SYMBOL(acpi_bus_get_device);
 
 static void get_acpi_device(void *dev)
 {
-	if (dev)
-		get_device(&((struct acpi_device *)dev)->dev);
+	acpi_dev_get(dev);
 }
 
 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
@@ -615,7 +614,7 @@ struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
 
 void acpi_bus_put_acpi_device(struct acpi_device *adev)
 {
-	put_device(&adev->dev);
+	acpi_dev_put(adev);
 }
 
 static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id)
@@ -2386,7 +2385,7 @@ int __init acpi_scan_init(void)
 			acpi_detach_data(acpi_root->handle,
 					 acpi_scan_drop_device);
 			acpi_device_del(acpi_root);
-			put_device(&acpi_root->dev);
+			acpi_bus_put_acpi_device(acpi_root);
 			goto out;
 		}
 	}
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 834b7a1f7405..b728173a6171 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -707,6 +707,12 @@ acpi_dev_get_first_match_dev(const char *hid, const char *uid, s64 hrv);
 	     adev;							\
 	     adev = acpi_dev_get_next_match_dev(adev, hid, uid, hrv))
 
+static inline void acpi_dev_get(struct acpi_device *adev)
+{
+	if (adev)
+		get_device(&adev->dev);
+}
+
 static inline void acpi_dev_put(struct acpi_device *adev)
 {
 	put_device(&adev->dev);
-- 
2.31.1