Re: [linux-usb-devel] Re: USB storage problems on OHCI..

[Ruud Linders <rkmp@xs4all.nl>]

Linus Torvalds wrote:
> On Tue, 23 Sep 2003, Ruud Linders wrote:
> 
>>I tried the patch but it doesn't work for me using an USB-2 Memory stick
>>"DiskonKey" on an USB-2 port (with uhci_hcd & ehci_hcd loaded).
>>
>>After a 3 minute time-out I get
>>     "SCSI device sda: drive cache: write through"
>>and the device starts working just fine.
> 
> 
> Is this different from a plain kernel _without_ the patch?
> 

No difference.

> 
>>Unloading the ehci_hcd module doesn't make any difference.
>>Only when ripping out the whole mode-sense call it works immediately :-)
>>so it appears the device is just unhappy about the sd_do_mode_sense.
> 
> 
> Yes, I think we might want to mark USB devices as being write-through by 
> default. That said, I think the patch is still better than what we have 
> now (which just doesn't make any sense at all).
> 

Fully agree here, 2.4.2x doesn't appear to do this mode_sense checking
and works with all the usb-mass-storage devices I tried.


> 		Linus
> 
> 


_
Ruud