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SubjectRe: [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@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.

Andrew, Linus?
-
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