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of: reserved-memory: Fix using wrong number of cells to get property 'alignment'

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commit 267b21d0bef8e67dbe6c591c9991444e58237ec9 upstream.

According to DT spec, size of property 'alignment' is based on parent
node’s #size-cells property.

But __reserved_mem_alloc_size() wrongly uses @dt_root_addr_cells to get
the property obviously.

Fix by using @dt_root_size_cells instead of @dt_root_addr_cells.

Fixes: 3f0c820664 ("drivers: of: add initialization code for dynamic reserved memory")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Link: https://lore.kernel.org/r/20250109-of_core_fix-v4-9-db8a72415b8c@quicinc.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zijun Hu 2025-01-09 21:27:00 +08:00 • committed by Greg Kroah-Hartman
commit 4aac5315dc
1 changed files with 2 additions and 2 deletions
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4
drivers/of/of_reserved_mem.c
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@ -96,12 +96,12 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
prop = of_get_flat_dt_prop(node, "alignment", &len);
if (prop) {
if (len != dt_root_addr_cells * sizeof(__be32)) {
if (len != dt_root_size_cells * sizeof(__be32)) {
pr_err("invalid alignment property in '%s' node.\n",
uname);
return -EINVAL;
}
align = dt_mem_next_cell(dt_root_addr_cells, &prop);
align = dt_mem_next_cell(dt_root_size_cells, &prop);
}
/* Need adjust the alignment to satisfy the CMA requirement */