The following reply was made to PR kern/34070; it has been noted by GNATS.

From: Matthias Drochner <M.Drochner@fz-juelich.de>
To: Iain Hibbert <plunky@rya-online.net>
Cc: gnats-bugs@NetBSD.org, kern-bug-people@NetBSD.org,
	gnats-admin@NetBSD.org, netbsd-bugs@NetBSD.org, wulf@NetBSD.org
Subject: Re: kern/34070: btconfig: SIOCSBTFLAGS: Resource temporarily 
 unavailable
Date: Fri, 24 Nov 2006 11:54:46 +0100

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 OK, another try...
 
 [data toggle code in ehci.c]
 M.Drochner@fz-juelich.de said:
 > The code above looks bogus - I can't imagine how transactions which
 > are not executed could contribute to the state of the data toggle
 > protocol. 
 
 Now I understand that that code (partially) rolls back a data toggle
 pre-computation in ehci_alloc_sqtd_chain().
 There is an obvious flaw however: It doesn't care about alignment
 wrt wMaxPacketSize, so it will miss a packet under some conditions.
 I'm not so eager to mess with that code right now, but I see an easy
 workaround which is at least good to prove that theory: Allocate
 transfer buffers in multiples of wMaxPacketSize.
 With the appended patch my ubt initializes, and an "btconfig -vvv"
 finishes successfully.
 
 best regards
 Matthias
 
 
 
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 Index: ubt.c
 ===================================================================
 RCS file: /cvsroot/src/sys/dev/usb/ubt.c,v
 retrieving revision 1.20
 diff -u -p -r1.20 ubt.c
 --- ubt.c	16 Nov 2006 01:33:26 -0000	1.20
 +++ ubt.c	24 Nov 2006 10:38:31 -0000
 @@ -151,7 +151,7 @@ SYSCTL_SETUP(sysctl_hw_ubt_debug_setup, 
   */
  #define UBT_BUFSIZ_CMD		(HCI_CMD_PKT_SIZE - 1)
  #define UBT_BUFSIZ_ACL		(2048 - 1)
 -#define UBT_BUFSIZ_EVENT	(HCI_EVENT_PKT_SIZE - 1)
 +#define UBT_BUFSIZ_EVENT	272 /*(HCI_EVENT_PKT_SIZE - 1)*/
  
  /* Interrupt Interval from (Bluetooth spec) */
  #define UBT_EVENT_INTERVAL	1	/* 1ms */
 
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