Prevent potential double frees in sg driver
sg_ioctl could be spammed by requests, leading to a double free in
__free_pages. This protects the entry points of sg_ioctl where the
memory could be corrupted by a double call to __free_pages if multiple
requests are happening concurrently.
Bug:35644812
Change-Id: Ie13f65beb6974430f90292e2742841b26aecb8b1
Signed-off-by:
Robb Glasser <rglasser@google.com>
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