netdev - [patch] document hci

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Message-ID: <20080419164628.GA2214@elf.ucw.cz>
Date:	Sat, 19 Apr 2008 18:49:47 +0200
From:	Pavel Machek <pavel@....cz>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	hidave.darkstar@...il.com, linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [patch] document hci_usb as broken

Hi!

>> ok...  But as long as the old code is buildable and installable, we should
>> fix bugs in it?
>
> I am okay with it and happy to accept any fixes, but to be quite honest, 
> that this driver still works is in some cases pure luck. Doing the URB 
> handling by ourself is really simply plain work. No excuses here and parts 
> of it is my fault. I know that. Hence I started a new implementation from 
> scratch.

Ok, so I guess this is good idea... (I'd prefer previous race patch to
still be applied; but driver is broken even with that fix...)

I thought about adding && BROKEN to Kconfig...

---

hci_usb is fatally broken, document it as such.

Signed-off-by: Pavel Machek <pavel@...e.cz>

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 075598e..20d9279 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -3,13 +3,16 @@ menu "Bluetooth device drivers"
 	depends on BT
 
 config BT_HCIUSB
-	tristate "HCI USB driver"
+	tristate "HCI USB driver (dangerous, use alternate driver below)"
 	depends on USB
 	help
 	  Bluetooth HCI USB driver.
 	  This driver is required if you want to use Bluetooth devices with
 	  USB interface.
 
+	  Unfortunately, locking in this driver is fatally broken; it will
+	  corrupt memory on surprise disconnect and during resume.
+
 	  Say Y here to compile support for Bluetooth USB devices into the
 	  kernel or say M to compile it as module (hci_usb).
 
diff --git a/drivers/bluetooth/hci_usb.c b/drivers/bluetooth/hci_usb.c
index 192522e..6cc96b4 100644
--- a/drivers/bluetooth/hci_usb.c
+++ b/drivers/bluetooth/hci_usb.c
@@ -1,8 +1,22 @@
-/* 
+/*
+
+    This driver has fatally broken locking.
+
+    DO NOT USE.
+
+    See btusb.c for cleaner / shorter / actually working driver.
+
+
+
+
+
+
+
+
+ 
    HCI USB driver for Linux Bluetooth protocol stack (BlueZ)
    Copyright (C) 2000-2001 Qualcomm Incorporated
    Written 2000,2001 by Maxim Krasnyansky <maxk@...lcomm.com>
-
    Copyright (C) 2003 Maxim Krasnyansky <maxk@...lcomm.com>
 
    This program is free software; you can redistribute it and/or modify

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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