dm: avoid assignment in if conditions

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

drivers/md/dm-crypt.c

@@ -3416,9 +3416,12 @@ static int crypt_map(struct dm_target *ti, struct bio *bio)
 	if (cc->on_disk_tag_size) {
 		unsigned int tag_len = cc->on_disk_tag_size * (bio_sectors(bio) >> cc->sector_shift);
 
-		if (unlikely(tag_len > KMALLOC_MAX_SIZE) ||
-		    unlikely(!(io->integrity_metadata = kmalloc(tag_len,
-				GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
+		if (unlikely(tag_len > KMALLOC_MAX_SIZE))
+			io->integrity_metadata = NULL;
+		else
+			io->integrity_metadata = kmalloc(tag_len, GFP_NOIO | __GFP_NORETRY | __GFP_NOMEMALLOC | __GFP_NOWARN);
+
+		if (unlikely(!io->integrity_metadata)) {
 			if (bio_sectors(bio) > cc->tag_pool_max_sectors)
 				dm_accept_partial_bio(bio, cc->tag_pool_max_sectors);
 			io->integrity_metadata = mempool_alloc(&cc->tag_pool, GFP_NOIO);

drivers/md/dm-stats.c

@@ -1046,7 +1046,8 @@ static int message_stats_create(struct mapped_device *md,
 			else if (!strncasecmp(a, "histogram:", 10)) {
 				if (n_histogram_entries)
 					goto ret_einval;
-				if ((r = parse_histogram(a + 10, &n_histogram_entries, &histogram_boundaries)))
+				r = parse_histogram(a + 10, &n_histogram_entries, &histogram_boundaries);
+				if (r)
 					goto ret;
 			} else
 				goto ret_einval;

drivers/md/dm-table.c

@@ -374,7 +374,8 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
 		if (!dd)
 			return -ENOMEM;
 
-		if ((r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev))) {
+		r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev);
+		if (r) {
 			kfree(dd);
 			return r;
 		}

drivers/md/dm-writecache.c

@@ -1832,10 +1832,13 @@ static void __writecache_writeback_pmem(struct dm_writecache *wc, struct writeba
 		wb->wc = wc;
 		bio->bi_end_io = writecache_writeback_endio;
 		bio->bi_iter.bi_sector = read_original_sector(wc, e);
-		if (max_pages <= WB_LIST_INLINE ||
-		    unlikely(!(wb->wc_list = kmalloc_array(max_pages, sizeof(struct wc_entry *),
-							   GFP_NOIO | __GFP_NORETRY |
-							   __GFP_NOMEMALLOC | __GFP_NOWARN)))) {
+
+		if (unlikely(max_pages > WB_LIST_INLINE))
+			wb->wc_list = kmalloc_array(max_pages, sizeof(struct wc_entry *),
+						    GFP_NOIO | __GFP_NORETRY |
+						    __GFP_NOMEMALLOC | __GFP_NOWARN);
+
+		if (likely(max_pages <= WB_LIST_INLINE) || unlikely(!wb->wc_list)) {
 			wb->wc_list = wb->wc_list_inline;
 			max_pages = WB_LIST_INLINE;
 		}