fix erasing/protecting flashes with unspecified size

fixes: 81737c1 mtd: Fix erasing of devices >4GiB

Several places erased a complete flash partition passing ~0 as count to
erase(). With the above commit count to erase was changed from an unsigned
type to a signed type, so the (count > f->size - offset) check in
erase() no longer triggers and the ~0 count is no longer adjusted to the whole
device size. Among other things this results in saveenv failures on NOR
flashes.
This patch fixes this by introducing an explicit macro for erasing the
whole device which is tested for in erase(). All other negative values
are rejected.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reported-by: Giorgio <giorgio.nicole@arcor.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/fs.h b/include/fs.h
index b9d1e6e09a..943ba55439 100644
--- a/include/fs.h
+++ b/include/fs.h
@@ -147,6 +147,7 @@ int umount(const char *pathname);
 int umount_by_cdev(struct cdev *cdev);
 
 /* not-so-standard functions */
+#define ERASE_SIZE_ALL	((loff_t) - 1)
 int erase(int fd, loff_t count, loff_t offset);
 int protect(int fd, size_t count, loff_t offset, int prot);
 int protect_file(const char *file, int prot);