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https://github.com/libretro/Lakka-LibreELEC.git
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85 lines
3.1 KiB
Diff
85 lines
3.1 KiB
Diff
From 49b268ce3036b2645c3a0caeaefb625f7a2d5982 Mon Sep 17 00:00:00 2001
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From: Andre Przywara <andre.przywara@arm.com>
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Date: Fri, 3 Feb 2023 11:11:18 +0000
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Subject: [PATCH] refactor(fdt): introduce common fdt_node_is_enabled()
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There are several users in the tree which want to check whether a given
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FDT node is enabled or not: the "status" property holds that
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information. So far all those users provide private implementations,
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some of them having issues.
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Export a generic implementation of that function in fdt_wrappers.h, as
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a "static inline" function to not increase code size.
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Also replace the existing implementation in Arm's fconf code, which had
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a tiny bug in needlessly using the property length:
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"status = [6f 6b 61 79 20];" would pass the check, where it should not.
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The proper solution is also simpler: status must be a string, and
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strings must be NUL-terminated in a DT. strcmp() would terminate on the
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first NUL in *either* of the two strings it compares, so it would never
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walk beyond the property boundary in the DTB.
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Change-Id: I9d89093432f127c09add6cf5c93a725bc534e5de
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Signed-off-by: Andre Przywara <andre.przywara@arm.com>
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---
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include/common/fdt_wrappers.h | 10 ++++++++++
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plat/arm/common/fconf/fconf_ethosn_getter.c | 15 ---------------
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2 files changed, 10 insertions(+), 15 deletions(-)
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diff --git a/include/common/fdt_wrappers.h b/include/common/fdt_wrappers.h
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index 2929fc23d5bb..b16510f3d971 100644
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--- a/include/common/fdt_wrappers.h
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+++ b/include/common/fdt_wrappers.h
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@@ -10,6 +10,7 @@
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#define FDT_WRAPPERS_H
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#include <libfdt_env.h>
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+#include <libfdt.h>
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/* Number of cells, given total length in bytes. Each cell is 4 bytes long */
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#define NCELLS(len) ((len) / 4U)
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@@ -53,6 +54,15 @@ static inline uint32_t fdt_blob_size(const void *dtb)
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return fdt32_to_cpu(dtb_header[1]);
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}
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+static inline bool fdt_node_is_enabled(const void *fdt, int node)
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+{
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+ int len;
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+ const void *prop = fdt_getprop(fdt, node, "status", &len);
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+
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+ /* A non-existing status property means the device is enabled. */
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+ return (prop == NULL) || (len == 5 && strcmp(prop, "okay") == 0);
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+}
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+
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#define fdt_for_each_compatible_node(dtb, node, compatible_str) \
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for (node = fdt_node_offset_by_compatible(dtb, -1, compatible_str); \
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node >= 0; \
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diff --git a/plat/arm/common/fconf/fconf_ethosn_getter.c b/plat/arm/common/fconf/fconf_ethosn_getter.c
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index 0b48a9816338..251471e63b6a 100644
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--- a/plat/arm/common/fconf/fconf_ethosn_getter.c
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+++ b/plat/arm/common/fconf/fconf_ethosn_getter.c
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@@ -20,21 +20,6 @@ struct ethosn_sub_allocator_t {
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uint32_t stream_id;
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};
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-static bool fdt_node_is_enabled(const void *fdt, int node)
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-{
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- int len;
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- const char *node_status;
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-
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- node_status = fdt_getprop(fdt, node, "status", &len);
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- if (node_status == NULL ||
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- (len == 5 && /* Includes null character */
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- strncmp(node_status, "okay", 4U) == 0)) {
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- return true;
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- }
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-
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- return false;
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-}
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-
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static bool fdt_node_has_reserved_memory(const void *fdt, int dev_node)
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{
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return fdt_get_property(fdt, dev_node, "memory-region", NULL) != NULL;
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--
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2.39.1
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