linux-kernel - Re: [linux-usb-devel] spontaneous disconnect with "usb-storage: implement autosuspend"

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Date:	Wed, 12 Sep 2007 22:33:48 -0400
From:	Mark Lord <lkml@....ca>
To:	Greg KH <greg@...ah.com>
Cc:	Oliver Neukum <oliver@...kum.org>,
	Paolo Ornati <ornati@...twebnet.it>,
	linux-usb-devel@...ts.sourceforge.net,
	Alan Stern <stern@...land.harvard.edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [linux-usb-devel] spontaneous disconnect with "usb-storage:	implement
 autosuspend"

Greg KH wrote:
>
> There are many regressions right now, _ONLY_ if you enable
> CONFIG_USB_SUSPEND.  If you disable that, your problems will go away,
> right?
..
> Oh, and currently no distro will enable this option due to the hardware
> problems, so the only people that could get hit by this are those who
> build their own kernels, and they can easily disable the option.

Ubuntu has CONFIG_USB_SUSPEND=y

There are probably lots of other distros that use it as well.

This new behaviour (failed operation of USB flash keys) is a *new* regression
in 2.6.23, and we still have time to fix it by either reverting the changed
functionality, or by changing the code to default OFF.

Here's my patch for 2.6.23-rc6+ :

Fix USB Storage failures.

Signed-Off-By:  Mark Lord <mlord@...ox.com>
---

--- linux/drivers/usb/storage/usb.c.orig	2007-09-11 11:52:14.000000000 -0400
+++ linux/drivers/usb/storage/usb.c	2007-09-12 18:18:35.000000000 -0400
@@ -1065,7 +1065,7 @@
 	.pre_reset =	storage_pre_reset,
 	.post_reset =	storage_post_reset,
 	.id_table =	storage_usb_ids,
-	.supports_autosuspend = 1,
+	.supports_autosuspend = 0,
 };
 
 static int __init usb_stor_init(void)
-
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