linux-kernel - ACPI: Properly clear flags on false-positives and send uevent on sudden unplug

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Message-ID: <20080806155601.GA4243@homac.suse.de>
Date:	Wed, 6 Aug 2008 17:56:01 +0200
From:	Holger Macht <hmacht@...e.de>
To:	linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>,
	Len Brown <lenb@...nel.org>, ak@...ux.intel.com
Subject: ACPI: Properly clear flags on false-positives and send uevent on
	sudden unplug

Some devices emit a ACPI_NOTIFY_DEVICE_CHECK while physically unplugging
even if the software undock has already been done and dock_present() check
fails. However, the internal flags need to be cleared (complete_undock()).

Also, even notify userspace if the dock station suddently went away
without proper software undocking.

Signed-off-by: Holger Macht <hmacht@...e.de>
---

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index bb7c51f..7d2edf1 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -563,9 +563,6 @@ EXPORT_SYMBOL_GPL(unregister_hotplug_dock_device);
  */
 static int handle_eject_request(struct dock_station *ds, u32 event)
 {
-	if (!dock_present(ds))
-		return -ENODEV;
-
 	if (dock_in_progress(ds))
 		return -EBUSY;
 
@@ -573,8 +570,16 @@ static int handle_eject_request(struct dock_station *ds, u32 event)
 	 * here we need to generate the undock
 	 * event prior to actually doing the undock
 	 * so that the device struct still exists.
+	 * Also, even send the dock event if the
+	 * device is not present anymore
 	 */
 	dock_event(ds, event, UNDOCK_EVENT);
+
+	if (!dock_present(ds)) {
+		complete_undock(ds);
+		return -ENODEV;
+	}
+
 	hotplug_dock_devices(ds, ACPI_NOTIFY_EJECT_REQUEST);
 	undock(ds);
 	eject_dock(ds);
--
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