USB: uas: add locking
Add spinlock to protect uas data structures. [ v2: s/GFP_NOIO/GFP_ATOMIC/, better don't sleep when holding a spinlock ] Signed-off-by: NGerd Hoffmann <kraxel@redhat.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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