lift locking/unlocking ep->mtx out of ep_{start,done}_scan()

get rid of depth/ep_locked arguments there and document
the kludge in ep_item_poll() that has lead to ep_locked existence in
the first place

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-08-31 13:41:30 -04:00
commit 57804b1cc4