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fdt: Fix alignment issue when reading 64-bits properties from fdt

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The FDT specification [0] gives a requirement of aligning properties on
32-bits. Make sure that the compiler is aware of this constraint when
accessing 64-bits properties.

[0]: https://github.com/devicetree-org/devicetree-specification/blob/master/source/flattened-format.rst

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jean-Jacques Hiblot 2019-10-22 10:05:22 +02:00 committed by Simon Glass
parent 97b5f9d1a0
commit d60ae4c59d
4 changed files with 4 additions and 3 deletions
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2
common/fdt_support.c
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@ -1566,7 +1566,7 @@ static int fdt_read_prop(const fdt32_t *prop, int prop_len, int cell_off,
uint64_t *val, int cells)
{
const fdt32_t *prop32 = &prop[cell_off];
const fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
const unaligned_fdt64_t *prop64 = (const fdt64_t *)&prop[cell_off];
if ((cell_off + cells) > prop_len)
return -FDT_ERR_NOSPACE;

2
drivers/core/ofnode.c
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@ -57,7 +57,7 @@ int ofnode_read_s32_default(ofnode node, const char *propname, s32 def)
int ofnode_read_u64(ofnode node, const char *propname, u64 *outp)
{
const fdt64_t *cell;
const unaligned_fdt64_t *cell;
int len;
assert(ofnode_valid(node));

1
include/linux/libfdt_env.h
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@ -16,6 +16,7 @@
typedef __be16 fdt16_t;
typedef __be32 fdt32_t;
typedef __be64 fdt64_t;
typedef __be64 unaligned_fdt64_t __aligned(4);
#define fdt32_to_cpu(x) be32_to_cpu(x)
#define cpu_to_fdt32(x) cpu_to_be32(x)

2
lib/fdtdec.c
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@ -242,7 +242,7 @@ int fdtdec_get_pci_bar32(struct udevice *dev, struct fdt_pci_addr *addr,
uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
uint64_t default_val)
{
const uint64_t *cell64;
const unaligned_fdt64_t *cell64;
int length;
cell64 = fdt_getprop(blob, node, prop_name, &length);