mtd: do not use mtd->suspend and mtd->resume directly

Just call the 'mtd_suspend()' and 'mtd_resume()' - they will do nothing
if the operation is not defined.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/maps/physmap.c

@@ -190,9 +190,8 @@ static void physmap_flash_shutdown(struct platform_device *dev)
 	int i;
 
 	for (i = 0; i < MAX_RESOURCES && info->mtd[i]; i++)
-		if (info->mtd[i]->suspend && info->mtd[i]->resume)
-			if (mtd_suspend(info->mtd[i]) == 0)
-				mtd_resume(info->mtd[i]);
+		if (mtd_suspend(info->mtd[i]) == 0)
+			mtd_resume(info->mtd[i]);
 }
 #else
 #define physmap_flash_shutdown NULL

drivers/mtd/maps/rbtx4939-flash.c

@@ -119,9 +119,8 @@ static void rbtx4939_flash_shutdown(struct platform_device *dev)
 {
 	struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
 
-	if (info->mtd->suspend && info->mtd->resume)
-		if (mtd_suspend(info->mtd) == 0)
-			mtd_resume(info->mtd);
+	if (mtd_suspend(info->mtd) == 0)
+		mtd_resume(info->mtd);
 }
 #else
 #define rbtx4939_flash_shutdown NULL

drivers/mtd/mtdcore.c

@@ -119,10 +119,7 @@ static int mtd_cls_suspend(struct device *dev, pm_message_t state)
 {
 	struct mtd_info *mtd = dev_get_drvdata(dev);
 
-	if (mtd && mtd->suspend)
-		return mtd_suspend(mtd);
-	else
-		return 0;
+	return mtd_suspend(mtd);
 }
 
 static int mtd_cls_resume(struct device *dev)

include/linux/mtd/mtd.h

@@ -427,12 +427,15 @@ static inline int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
 
 static inline int mtd_suspend(struct mtd_info *mtd)
 {
+	if (!mtd->suspend)
+		return -EOPNOTSUPP;
 	return mtd->suspend(mtd);
 }
 
 static inline void mtd_resume(struct mtd_info *mtd)
 {
-	mtd->resume(mtd);
+	if (mtd->resume)
+		mtd->resume(mtd);
 }
 
 static inline int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)