disconnect and uas_work_list

[Oliver Neukum <oneukum@xxxxxxx>]

Hi,

going through uas it looks to me like there is a race by which
uas_do_work() can walk uas_work_list and do IO to a device
after it has been removed. This makes me wonder why you used
a single global list. Could you comment on that and tell me whether
I missed something subtle?

	Regards
		Oliver

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