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Subject[PATCH V2] mm/cma: cma_declare_contiguous: correct err handling
Date
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:

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---

V2:
Per Mike's comments, add more information in commit log
Add R-B

mm/cma.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

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;
--
2.16.4
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