linux-kernel - [PATCH] bay: Exit if notify handler cannot be installed

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Message-ID: <20080521104547.GA8097@homac>
Date:	Wed, 21 May 2008 12:45:47 +0200
From:	Holger Macht <hmacht@...e.de>
To:	linux-acpi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, kristen.c.accardi@...el.com,
	Len Brown <lenb@...nel.org>
Subject: [PATCH] bay: Exit if notify handler cannot be installed

If acpi_install_notify_handler() for a bay device fails, the bay driver is
superfluous. Most likely, another driver (like libata) is already caring
about this device anyway. Furthermore,
register_hotplug_dock_device(acpi_handle) from the dock driver must not be
called twice with the same handler. This would result in an endless loop
consuming 100% of CPU. So clean up and exit.

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

diff --git a/drivers/acpi/bay.c b/drivers/acpi/bay.c
index d2fc941..26038c2 100644
--- a/drivers/acpi/bay.c
+++ b/drivers/acpi/bay.c
@@ -301,16 +301,20 @@ static int bay_add(acpi_handle handle, int id)
 	 */
 	pdev->dev.uevent_suppress = 0;
 
-	if (acpi_bay_add_fs(new_bay)) {
-		platform_device_unregister(new_bay->pdev);
-		goto bay_add_err;
-	}
-
 	/* register for events on this device */
 	status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
 			bay_notify, new_bay);
 	if (ACPI_FAILURE(status)) {
-		printk(KERN_ERR PREFIX "Error installing bay notify handler\n");
+		printk(KERN_INFO PREFIX "Error installing bay notify handler\n");
+		platform_device_unregister(new_bay->pdev);
+		goto bay_add_err;
+	}
+
+	if (acpi_bay_add_fs(new_bay)) {
+		acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+					   bay_notify);
+		platform_device_unregister(new_bay->pdev);
+		goto bay_add_err;
 	}
 
 	/* if we are on a dock station, we should register for dock

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