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| author | Laura Abbott <lauraa@codeaurora.org> | 2014-02-25 11:01:19 -0800 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2014-05-15 12:14:21 +0200 |
| commit | 7ee793a62fa8c544f8b844e6e87b2d8e8836b219 (patch) | |
| tree | 5885be219592f9cf5a1cb2f81efda7148ad3019a /arch/arm/mm/dma-mapping.c | |
| parent | d6d211db37e75de2ddc3a4f979038c40df7cc79c (diff) | |
| download | lwn-7ee793a62fa8c544f8b844e6e87b2d8e8836b219.tar.gz lwn-7ee793a62fa8c544f8b844e6e87b2d8e8836b219.zip | |
cma: Remove potential deadlock situation
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.
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'arch/arm/mm/dma-mapping.c')
0 files changed, 0 insertions, 0 deletions