commonlib/region: make buffer argument const for writeat

The buffer for writeat() should be marked as const as
the contents won't be manipulated within the call.

BUG=chrome-os-partner:55932

Change-Id: I968570c1cf80f918a07b97af625a56f11b5889c1
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/16084
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/commonlib/include/commonlib/region.h b/src/commonlib/include/commonlib/region.h
index ffc507beae..bc3ded1d0a 100644
--- a/src/commonlib/include/commonlib/region.h
+++ b/src/commonlib/include/commonlib/region.h
@@ -52,8 +52,8 @@ ssize_t rdev_readat(const struct region_device *rd, void *b, size_t offset,
  * Returns < 0 on error otherwise returns size of data wrote at provided
  * offset from the buffer passed.
  */
-ssize_t rdev_writeat(const struct region_device *rd, void *b, size_t offset,
-			size_t size);
+ssize_t rdev_writeat(const struct region_device *rd, const void *b,
+			size_t offset, size_t size);
 
 /*
  * Returns < 0 on error otherwise returns size of data erased.
@@ -81,7 +81,7 @@ struct region_device_ops {
 	void *(*mmap)(const struct region_device *, size_t, size_t);
 	int (*munmap)(const struct region_device *, void *);
 	ssize_t (*readat)(const struct region_device *, void *, size_t, size_t);
-	ssize_t (*writeat)(const struct region_device *, void *, size_t,
+	ssize_t (*writeat)(const struct region_device *, const void *, size_t,
 		size_t);
 	ssize_t (*eraseat)(const struct region_device *, size_t, size_t);
 };