mtd: mtdoops: do not use mtd->panic_write directly

Instead of checking if 'mtd->panic_write' is defined, call 'mtd_panic_write()'
and check the error code - '-EOPNOTSUPP' will be returned if the function is
not defined.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 2c2a92247e5a..b72964049cdc 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -311,6 +311,8 @@ static inline int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
                                   size_t *retlen, const u_char *buf)
 {
         *retlen = 0;
+        if (!mtd->panic_write)
+                return -EOPNOTSUPP;
         return mtd->panic_write(mtd, to, len, retlen, buf);
 }