linux-kernel - [PATCH] acpi: handle the acpi hotplug schedule error

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Date:   Sat,  3 Jun 2017 15:38:58 +0800
From:   "Lee, Chun-Yi" <joeyli.kernel@...il.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lee, Chun-Yi" <jlee@...e.com>, Len Brown <lenb@...nel.org>
Subject: [PATCH] acpi: handle the acpi hotplug schedule error

Kernel should the decrement reference count of acpi device when
acpi hotplug work scheduling is failed. And, kernel should evaluates
_OST to notify BIOS the failure.

Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <lenb@...nel.org>
Signed-off-by: "Lee, Chun-Yi" <jlee@...e.com>
---
 drivers/acpi/bus.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 34fbe02..2f2cec9 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -427,8 +427,14 @@ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 	    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 		driver->ops.notify(adev, type);
 
-	if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
-		return;
+	if (hotplug_event) {
+		if (ACPI_FAILURE(acpi_hotplug_schedule(adev, type))) {
+			acpi_bus_put_acpi_device(adev);
+			goto err;
+		} else {
+			return;
+		}
+	}
 
 	acpi_bus_put_acpi_device(adev);
 	return;
-- 
2.10.2