From: Simon Glass <s...@chromium.org>
Allow enabling FDT_ASSUME_NO_ROLLBACK to disable rolling back after a
failed operation.
Signed-off-by: Simon Glass <s...@chromium.org>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
Message-Id: <20200220214557.176528-6-...@chromium.org>
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
---
cpukit/dtc/libfdt/fdt_rw.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/cpukit/dtc/libfdt/fdt_rw.c b/cpukit/dtc/libfdt/fdt_rw.c
index 707c00aabd..4a95ce2dea 100644
--- a/cpukit/dtc/libfdt/fdt_rw.c
+++ b/cpukit/dtc/libfdt/fdt_rw.c
@@ -114,6 +114,15 @@ static int fdt_splice_string_(void *fdt, int newlen)
return 0;
}
+/**
+ * fdt_find_add_string_() - Find or allocate a string
+ *
+ * @fdt: pointer to the device tree to check/adjust
+ * @s: string to find/add
+ * @allocated: Set to 0 if the string was found, 1 if not found and so
+ * allocated. Ignored if can_assume(NO_ROLLBACK)
+ * @return offset of string in the string table (whether found or added)
+ */
static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
{
char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
@@ -122,7 +131,8 @@ static int fdt_find_add_string_(void *fdt, const char *s,
int *allocated)
int len = strlen(s) + 1;
int err;
- *allocated = 0;
+ if (!can_assume(NO_ROLLBACK))
+ *allocated = 0;
p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
if (p)
@@ -134,7 +144,8 @@ static int fdt_find_add_string_(void *fdt, const char *s,
int *allocated)
if (err)
return err;
- *allocated = 1;
+ if (!can_assume(NO_ROLLBACK))
+ *allocated = 1;
memcpy(new, s, len);
return (new - strtab);
@@ -208,7 +219,8 @@ static int fdt_add_property_(void *fdt, int nodeoffset,
const char *name,
err = fdt_splice_struct_(fdt, *prop, 0, proplen);
if (err) {
- if (allocated)
+ /* Delete the string if we failed to add it */
+ if (!can_assume(NO_ROLLBACK) && allocated)
fdt_del_last_string_(fdt, name);
return err;
}
--
2.16.4
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