[PATCH] uimage: fix: broken uimage_open on tftp since forward lseek works

[Michael Grzeschik]

Since commit ce0cc7fe we support forward seek on tftpfs. This feature
breaks the condition to check rather we open an uimage over tftp. Since
random seeking is the problem here, we check in both directions.

Signed-off-by: Michael Grzeschik <m.grzeschik at pengutronix.de>
---
 common/uimage.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/common/uimage.c b/common/uimage.c
index 28a25bba2d..b07c6ff279 100644
--- a/common/uimage.c
+++ b/common/uimage.c
@@ -113,7 +113,8 @@ again:
 	 * this cannot be implemented in tftp fs, so we detect this
 	 * by doing a test lseek and copy the file to ram if it fails
 	 */
-	if (IS_BUILTIN(CONFIG_FS_TFTP) && lseek(fd, 0, SEEK_SET)) {
+	if (IS_BUILTIN(CONFIG_FS_TFTP) &&
+			(lseek(fd, 4, SEEK_SET) && lseek(fd, 0, SEEK_SET))) {
 		close(fd);
 		ret = copy_file(filename, uimage_tmp, 0);
 		if (ret)
-- 
2.11.0