dm table: replace while loops with for loops

Also remove some unnecessary use of uninitialized_var().

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

Author: Mikulas Patocka

drivers/md/dm-table.c

@@ -373,7 +373,7 @@ static int upgrade_mode(struct dm_dev_internal *dd, fmode_t new_mode,
  */
 dev_t dm_get_dev_t(const char *path)
 {
-	dev_t uninitialized_var(dev);
+	dev_t dev;
 	struct block_device *bdev;
 
 	bdev = lookup_bdev(path);
@@ -627,13 +627,13 @@ static int validate_hardware_logical_block_alignment(struct dm_table *table,
 
 	struct dm_target *uninitialized_var(ti);
 	struct queue_limits ti_limits;
-	unsigned i = 0;
+	unsigned i;
 
 	/*
 	 * Check each entry in the table in turn.
 	 */
-	while (i < dm_table_get_num_targets(table)) {
-		ti = dm_table_get_target(table, i++);
+	for (i = 0; i < dm_table_get_num_targets(table); i++) {
+		ti = dm_table_get_target(table, i);
 
 		blk_set_stacking_limits(&ti_limits);
 
@@ -854,11 +854,11 @@ static int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
 static bool dm_table_supports_dax(struct dm_table *t)
 {
 	struct dm_target *ti;
-	unsigned i = 0;
+	unsigned i;
 
 	/* Ensure that all targets support DAX. */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
+	for (i = 0; i < dm_table_get_num_targets(t); i++) {
+		ti = dm_table_get_target(t, i);
 
 		if (!ti->type->direct_access)
 			return false;
@@ -1010,11 +1010,11 @@ struct dm_target *dm_table_get_immutable_target(struct dm_table *t)
 
 struct dm_target *dm_table_get_wildcard_target(struct dm_table *t)
 {
-	struct dm_target *uninitialized_var(ti);
-	unsigned i = 0;
+	struct dm_target *ti;
+	unsigned i;
 
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
+	for (i = 0; i < dm_table_get_num_targets(t); i++) {
+		ti = dm_table_get_target(t, i);
 		if (dm_target_is_wildcard(ti->type))
 			return ti;
 	}
@@ -1321,15 +1321,16 @@ static int count_device(struct dm_target *ti, struct dm_dev *dev,
  */
 bool dm_table_has_no_data_devices(struct dm_table *table)
 {
-	struct dm_target *uninitialized_var(ti);
-	unsigned i = 0, num_devices = 0;
+	struct dm_target *ti;
+	unsigned i, num_devices;
 
-	while (i < dm_table_get_num_targets(table)) {
-		ti = dm_table_get_target(table, i++);
+	for (i = 0; i < dm_table_get_num_targets(table); i++) {
+		ti = dm_table_get_target(table, i);
 
 		if (!ti->type->iterate_devices)
 			return false;
 
+		num_devices = 0;
 		ti->type->iterate_devices(ti, count_device, &num_devices);
 		if (num_devices)
 			return false;
@@ -1344,16 +1345,16 @@ bool dm_table_has_no_data_devices(struct dm_table *table)
 int dm_calculate_queue_limits(struct dm_table *table,
 			      struct queue_limits *limits)
 {
-	struct dm_target *uninitialized_var(ti);
+	struct dm_target *ti;
 	struct queue_limits ti_limits;
-	unsigned i = 0;
+	unsigned i;
 
 	blk_set_stacking_limits(limits);
 
-	while (i < dm_table_get_num_targets(table)) {
+	for (i = 0; i < dm_table_get_num_targets(table); i++) {
 		blk_set_stacking_limits(&ti_limits);
 
-		ti = dm_table_get_target(table, i++);
+		ti = dm_table_get_target(table, i);
 
 		if (!ti->type->iterate_devices)
 			goto combine_limits;
@@ -1435,16 +1436,16 @@ static int device_flush_capable(struct dm_target *ti, struct dm_dev *dev,
 static bool dm_table_supports_flush(struct dm_table *t, unsigned long flush)
 {
 	struct dm_target *ti;
-	unsigned i = 0;
+	unsigned i;
 
 	/*
 	 * Require at least one underlying device to support flushes.
 	 * t->devices includes internal dm devices such as mirror logs
 	 * so we need to use iterate_devices here, which targets
 	 * supporting flushes must provide.
 	 */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
+	for (i = 0; i < dm_table_get_num_targets(t); i++) {
+		ti = dm_table_get_target(t, i);
 
 		if (!ti->num_flush_bios)
 			continue;
@@ -1504,10 +1505,10 @@ static bool dm_table_all_devices_attribute(struct dm_table *t,
 					   iterate_devices_callout_fn func)
 {
 	struct dm_target *ti;
-	unsigned i = 0;
+	unsigned i;
 
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
+	for (i = 0; i < dm_table_get_num_targets(t); i++) {
+		ti = dm_table_get_target(t, i);
 
 		if (!ti->type->iterate_devices ||
 		    !ti->type->iterate_devices(ti, func, NULL))
@@ -1528,10 +1529,10 @@ static int device_not_write_same_capable(struct dm_target *ti, struct dm_dev *de
 static bool dm_table_supports_write_same(struct dm_table *t)
 {
 	struct dm_target *ti;
-	unsigned i = 0;
+	unsigned i;
 
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
+	for (i = 0; i < dm_table_get_num_targets(t); i++) {
+		ti = dm_table_get_target(t, i);
 
 		if (!ti->num_write_same_bios)
 			return false;
@@ -1555,7 +1556,7 @@ static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev,
 static bool dm_table_supports_discards(struct dm_table *t)
 {
 	struct dm_target *ti;
-	unsigned i = 0;
+	unsigned i;
 
 	/*
 	 * Unless any target used by the table set discards_supported,
@@ -1564,8 +1565,8 @@ static bool dm_table_supports_discards(struct dm_table *t)
 	 * so we need to use iterate_devices here, which targets
 	 * supporting discard selectively must provide.
 	 */
-	while (i < dm_table_get_num_targets(t)) {
-		ti = dm_table_get_target(t, i++);
+	for (i = 0; i < dm_table_get_num_targets(t); i++) {
+		ti = dm_table_get_target(t, i);
 
 		if (!ti->num_discard_bios)
 			continue;