linux-kernel - [PATCH v1 3/7] ACPI: scan: Replace infinite for-loop with finite while-loop

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Message-ID: <20240325123444.3031851-4-andriy.shevchenko@linux.intel.com>
Date: Mon, 25 Mar 2024 14:32:59 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Robert Moore <robert.moore@...el.com>
Subject: [PATCH v1 3/7] ACPI: scan: Replace infinite for-loop with finite while-loop

The infinite loops is harder to understand (as one has to go
over the body in order to find main exit conditional) and it's
more verbose than usual approach with a while-loop.

Note, we may not use list_for_each_entry_safe() as there is locking
involved and the saved pointer may become invalid behind our back.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/acpi/scan.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 7c157bf92695..5e4118970285 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -530,15 +530,10 @@ static DEFINE_MUTEX(acpi_device_del_lock);
 
 static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 {
-	for (;;) {
-		struct acpi_device *adev;
+	struct acpi_device *adev;
 
-		mutex_lock(&acpi_device_del_lock);
-
-		if (list_empty(&acpi_device_del_list)) {
-			mutex_unlock(&acpi_device_del_lock);
-			break;
-		}
+	mutex_lock(&acpi_device_del_lock);
+	while (!list_empty(&acpi_device_del_list)) {
 		adev = list_first_entry(&acpi_device_del_list,
 					struct acpi_device, del_list);
 		list_del(&adev->del_list);
@@ -555,7 +550,10 @@ static void acpi_device_del_work_fn(struct work_struct *work_not_used)
 		 */
 		acpi_power_transition(adev, ACPI_STATE_D3_COLD);
 		acpi_dev_put(adev);
+
+		mutex_lock(&acpi_device_del_lock);
 	}
+	mutex_unlock(&acpi_device_del_lock);
 }
 
 /**
-- 
2.43.0.rc1.1.gbec44491f096