mtd: do not use mtd->read_*_prot_reg directly

Instead, call 'mtd_read_*_prot_info()' and check for -EOPNOTSUPP.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 7122efdc6d99..e488cf910914 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -352,6 +352,8 @@ static inline int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
                                          u_char *buf)
 {
         *retlen = 0;
+        if (!mtd->read_fact_prot_reg)
+                return -EOPNOTSUPP;
         return mtd->read_fact_prot_reg(mtd, from, len, retlen, buf);
 }
 
@@ -369,6 +371,8 @@ static inline int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
                                          u_char *buf)
 {
         *retlen = 0;
+        if (!mtd->read_user_prot_reg)
+                return -EOPNOTSUPP;
         return mtd->read_user_prot_reg(mtd, from, len, retlen, buf);
 }