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authorPeng Fan <peng.fan@nxp.com>2019-03-06 02:49:50 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-06 08:07:21 +0300
commit0d3bd18a5efd66097ef58622b898d3139790aa9d (patch)
treeb0c95f4cf90631352093bf25cb10f7e8fe15598d /mm/cma.c
parent0c81585499601acd1d0e1cbf424cabfaee60628c (diff)
downloadlinux-0d3bd18a5efd66097ef58622b898d3139790aa9d.tar.xz
mm/cma.c: cma_declare_contiguous: correct err handling
In case cma_init_reserved_mem failed, need to free the memblock allocated by memblock_reserve or memblock_alloc_range. Quote Catalin's comments: https://lkml.org/lkml/2019/2/26/482 Kmemleak is supposed to work with the memblock_{alloc,free} pair and it ignores the memblock_reserve() as a memblock_alloc() implementation detail. It is, however, tolerant to memblock_free() being called on a sub-range or just a different range from a previous memblock_alloc(). So the original patch looks fine to me. FWIW: Link: http://lkml.kernel.org/r/20190227144631.16708-1-peng.fan@nxp.com Signed-off-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/cma.c')
-rw-r--r--mm/cma.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/cma.c b/mm/cma.c
index c7b39dd3b4f6..f4f3a8a57d86 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -353,12 +353,14 @@ int __init cma_declare_contiguous(phys_addr_t base,
ret = cma_init_reserved_mem(base, size, order_per_bit, name, res_cma);
if (ret)
- goto err;
+ goto free_mem;
pr_info("Reserved %ld MiB at %pa\n", (unsigned long)size / SZ_1M,
&base);
return 0;
+free_mem:
+ memblock_free(base, size);
err:
pr_err("Failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M);
return ret;