On Tue, Feb 22, 2005 at 01:38:03PM -0500, Alan Stern wrote: > At present there's no way to do it in general. If you restrict your > program to the period while usb-storage waits before scanning the devices > then things will work, as you've seen. But there's no guarantee about how > long that period is; users can set it all the way down to 0. And ub has > no such settling period.
I'd also prefer not to have such a period, unless there are USB pen drives that require it, since it makes things unresponsive--when the player inserts a card, we play a sound and display the player's name on screen, so having that take several seconds (when it doesn't have to--the Shuffle seems to take a couple seconds to show up as a USB device regardless) is undesirable. We don't need to support other types of devices; people are free to plug in, for their own amusement, an IDE hard drive adapter or a USB camera at their local arcade, if they happen to work; but it's not a problem if they don't, as long as it doesn't interfere with the game. > A less general solution that could suffice for your problem would be to > have the kernel store the Manufacturer, Product, and Serial strings (and > also the Configuration and Interface name strings) rather than query the > device every time those sysfs files are accessed. This could be done > without much trouble. Part of the reason it hasn't is that devices are > allowed to change those strings at any time -- although I'm not aware of > any which do. Since those IDE converters seem to pass along the attached drive's name in one of those strings, I suppose it'd make sense that it'd need to change that string if the drive was hotplugged. Thanks. I don't think I'll have time to do this--short schedules suck, and I don't know the code well enough to implement this quickly--so I may have to disable the serial checking feature for this release. I'd hate to do that, though. -- Glenn Maynard ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
