On Thu, 21 Oct 2004, Alan Stern wrote:
> On Thu, 21 Oct 2004, Guennadi Liakhovetski wrote:
>
> > Actually, I had an impression, that this was already supported - the
> > user-space decides which driver to load for a specific event to cover
> > possible alternative / overlapping drivers... So, it might be, that it's
> > just usb/storage/usb.c that needs to be converted?
>
> It's not as simple as that (when is it ever?). Loading drivers is a
> separate operation from binding drivers to devices. If there are two
> drivers that can both manage the same device, and one of them is already
> loaded, then the kernel will bind that one to the device regardless of
> what the userspace hotplug programs do. Or if both are already loaded,
> the kernel will simply bind the first one on its list.
Right, that's logical. But in the case of ub / storage if you compile ub,
you have no chance to use usb-storage, even if you load it manually and ub
is not loaded. So, the question is - why cannot we get in this case too 2
competing drivers, having the ability to use either?
I think, I didn't explain my problem exactly. I coompiled all usb drivers
as modules, including usb-storage and ub. I don't use hotplug. I connect a
storage device (a card reader with a CF, or a memory stick), load
usb-storage (or in the reverse order) - it doesn't attach. ub does. In
drivers/usb/storage/usb.c I see
/* Bulk-only transport for all SubClass values */
...
#if !defined(CONFIG_BLK_DEV_UB) && !defined(CONFIG_BLK_DEV_UB_MODULE)
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
#endif
I thought, this was the problem, but I am not sure any more. So, is this
the expected behaviour or one should be able to use either driver just by
loading one or another?
Thanks
Guennadi
---------------------------------
Guennadi Liakhovetski, Ph.D.
DSA Daten- und Systemtechnik GmbH
Pascalstr. 28
D-52076 Aachen
Germany
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