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

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Date:	Wed, 12 Sep 2007 18:14:04 -0400
From:	Mark Lord <lkml@....ca>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	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"

Oliver Neukum wrote:
> Am Dienstag 14 August 2007 schrieb Paolo Ornati:
>> On Tue, 14 Aug 2007 17:46:16 +0200
>> Oliver Neukum <oliver@...kum.org> wrote:
>>
>>> Am Dienstag 14 August 2007 schrieb Paolo Ornati:
>>>> Hewlett-Packard PhotoSmart 720 / PhotoSmart 935 (storage)  
>>> Please try this patch.
>> Tried on -rc3 but it doesn't work, dmesg attached.
>>
>> However I've found that if "hald" is running the problems doesn't
>> happen (I think it's just hidden by the fact that hald do some polling
>> on it preventing autosuspend to trigger).
> 
> Exactly. This is not reliable. It needs to be done in kernel. This patch
> should do it.
> 
> 	Regards
> 		Oliver
> 
> ---
> 
> --- a/drivers/usb/core/quirks.c	2007-08-14 17:42:22.000000000 +0200
> +++ b/drivers/usb/core/quirks.c	2007-08-14 20:30:28.000000000 +0200
> @@ -30,6 +30,8 @@
>  static const struct usb_device_id usb_quirk_list[] = {
>  	/* HP 5300/5370C scanner */
>  	{ USB_DEVICE(0x03f0, 0x0701), .driver_info = USB_QUIRK_STRING_FETCH_255 },
> +	/* Hewlett-Packard PhotoSmart 720 / PhotoSmart 935 (storage) */
> +	{ USB_DEVICE(0x03f0, 0x4002), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
>  	/* Acer Peripherals Inc. (now BenQ Corp.) Prisa 640BU */
>  	{ USB_DEVICE(0x04a5, 0x207e), .driver_info = USB_QUIRK_NO_AUTOSUSPEND },
>  	/* Benq S2W 3300U */
> -

I believe the offending commit needs to be reverted.
It just breaks too much stuff, including my Sandisk USB sticks.

> with "CONFIG_USB_SUSPEND=y", since commit:
> 
> 8dfe4b14869fd185ca25ee88b02ada58a3005eaf
>     usb-storage: implement autosuspend
>     
>     This patch (as930) implements autosuspend for usb-storage.  It is
>     adapted from a patch by Oliver Neukum.  Autosuspend is allowed except
>     during LUN scanning, resets, and command execution.
> 
> my USB photo-camera gets automagically disconnected before I can do
> anything with it  ;) 

Ditto for several other devices that are being slowly special-cased,
and many that have yet to be tested.  This commit is (unfortunately)
a disaster with many regressions.

Andrew, Linus?
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