tree 06c148262fba293e4e5094f3797f2814e4cfff8a
parent 217336cad0c0d98bb32cb781bb13c1a07f5a203c
author Laura Abbott <lauraa@codeaurora.org> 1395350477 -0700
committer Laura Abbott <lauraa@codeaurora.org> 1396028359 -0700

cma: Make locking finer grained

CMA locking is currently very coarse. The cma_mutex protects both
the bitmap and avoids concurrency with alloc_contig_range. There
are several situations which may result in a deadlock on the CMA
mutex currently, mostly involving AB/BA situations with alloc and
free. Fix this issue by protecting the bitmap with a mutex per CMA
region and use the existing mutex for protecting against concurrency
with alloc_contig_range.

Change-Id: I6863ba7ab7fae07c68fee23b0aa4c869244fe2a1
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>