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SubjectRe: [linux-usb-devel] spontaneous disconnect with "usb-storage: implement autosuspend"
Greg KH wrote:
> On Wed, Sep 12, 2007 at 06:14:04PM -0400, Mark Lord wrote:
>> Oliver Neukum wrote:
>>> Am Dienstag 14 August 2007 schrieb Paolo Ornati:
>>>> On Tue, 14 Aug 2007 17:46:16 +0200
>>>> Oliver Neukum <oliver@neukum.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.
>
> There are many regressions right now, _ONLY_ if you enable
> CONFIG_USB_SUSPEND. If you disable that, your problems will go away,
> right?
>
> This option is a new option, and we have found out the hard way that
> a very large class of hardware really does not like working with usb
> suspend at all.

CONFIG_USB_SUSPEND is *not* a new config option.
It's been around for quite some time now, and I also had it
enabled in 2.6.22 without any troubles. Definite regression here, folks!

Cheers
-
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