The fixed parameter to cma_declare_contiguous() tells the function
whether the given base address must be honoured or should be considered
as a hint only. The API considers a zero base address as meaning any
base address, which must never be considered as a fixed value.
Part of the implementation correctly checks both fixed and base != 0,
but two locations check the fixed value only. Set fixed to false when
base is 0 to fix that and simplify the code.
Signed-off-by: Laurent Pinchart <laurent.pinchart+rene...@ideasonboard.com>
---
mm/cma.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/cma.c b/mm/cma.c
index 16c6650..6b14346 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -239,6 +239,9 @@ int __init cma_declare_contiguous(phys_addr_t base,
size = ALIGN(size, alignment);
limit &= ~(alignment - 1);
+ if (!base)
+ fixed = false;
+
/* size should be aligned with order_per_bit */
if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit))
return -EINVAL;
@@ -262,7 +265,7 @@ int __init cma_declare_contiguous(phys_addr_t base,
}
/* Reserve memory */
- if (base && fixed) {
+ if (fixed) {
if (memblock_is_region_reserved(base, size) ||
memblock_reserve(base, size) < 0) {
ret = -EBUSY;
--
2.0.4
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