linux-kernel - [PATCH] set dock_station->flags to zero during dock

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Message-ID: <20100201163043.GA3240@think>
Date:	Mon, 1 Feb 2010 11:30:44 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Chiang <achiang@...com>
Subject: [PATCH] set dock_station->flags to zero during dock_add

Before fe06fba292af5ed5c1c6ad9af3a9ef68da7a5088 the dock_station struct
was allocated and zero filled by kzalloc.  Now it is allocated by
platform_device_register_data(), apparently via a kmemdup of a variable
on the stack?

Now we no longer init dock_station->flags to zero, and my x60 laptop was
lucky enough to always have DOCK_DOCKING set.  So, I always saw -EBUSY
when I tried to undock.

With the patch below, I can dock and undock properly again.  I double
checked that dock_station->flags was the only field that we were not
setting up.

This was just brute force guessing, I have no idea what this code does.

Signed-off-by: Chris Mason <chris.mason@...cle.com>

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index bbc2c13..0a449ad 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -944,6 +945,7 @@ static int dock_add(acpi_handle handle)
 	dock_station->handle = handle;
 	dock_station->dock_device = dd;
 	dock_station->last_dock_time = jiffies - HZ;
+	dock_station->flags = 0;

 	mutex_init(&dock_station->hp_lock);
 	spin_lock_init(&dock_station->dd_lock);
--
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