On Tue, 7 Jun 2005, Alan Stern wrote:
On Mon, 6 Jun 2005, Phil Dibowitz wrote:
Ultimately we may want to remove the FIX_CAPACITY flag. Thanks to the
design geniuses at Prolific we're caught in a "damned if you do, damned if
you don't" situation.
What about a sysfs option or sysctl?
I'm not wrapping my mind around why - is it because by the time we've
reached a point where we can tell the kernel something about that
device, it's too late?
These two questions are related, and your guess is basically correct. The
kernel wants to know the capacity soon after the device is detected. That
doesn't leave time for userspace to intervene. And before the device is
detected there's nothing to do, because the FIX_CAPACITY flag has to be
applied on a per-device basis. Imagine a system with _two_ PL-3507
devices, one with the firmware upgrade and one without...
In principle one could do something based on the SCSI ID or something
similar, but it wouldn't be very easy and it wouldn't be general -- every
user would have to insert the necessary data by hand. On the whole we're
better off not worrying about this until and unless it becomes a real
problem.
How about a module parameter for usb-storage?
ignorequirks=<0|1>
0=use unusual_devs.h (default)
1=ignore unusual_devs.h
or possibly, more flexibly:
ignorequirks=<vendor id>,<device id>,<0|1>
Alan Stern
Best Regards,
Alex.
--
Alex Butcher Brainbench MVP for Internet Security: www.brainbench.com
Bristol, UK Need reliable and secure network systems?
PGP/GnuPG ID:0x271fd950 <http://www.assursys.com/>
-------------------------------------------------------
This SF.Net email is sponsored by: NEC IT Guy Games. How far can you shotput
a projector? How fast can you ride your desk chair down the office luge track?
If you want to score the big prize, get to know the little guy.
Play to win an NEC 61" plasma display: http://www.necitguy.com/?r=20
_______________________________________________
linux-usb-devel@lists.sourceforge.net
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
