RDMA/rtrs-clt: Use the bitmap API to allocate bitmaps

Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.

It is less verbose and it improves the semantic.

Link: https://lore.kernel.org/r/ca9c5c8301d76d60de34640568b3db0d4401d050.1657298747.git.christophe.jaillet@wanadoo.frSigned-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/ulp/rtrs/rtrs-clt.c

@@ -1403,8 +1403,7 @@ static int alloc_permits(struct rtrs_clt_sess *clt)
 	unsigned int chunk_bits;
 	int err, i;
 
-	clt->permits_map = kcalloc(BITS_TO_LONGS(clt->queue_depth),
-				   sizeof(long), GFP_KERNEL);
+	clt->permits_map = bitmap_zalloc(clt->queue_depth, GFP_KERNEL);
 	if (!clt->permits_map) {
 		err = -ENOMEM;
 		goto out_err;
@@ -1426,7 +1425,7 @@ static int alloc_permits(struct rtrs_clt_sess *clt)
 	return 0;
 
 err_map:
-	kfree(clt->permits_map);
+	bitmap_free(clt->permits_map);
 	clt->permits_map = NULL;
 out_err:
 	return err;
@@ -1440,7 +1439,7 @@ static void free_permits(struct rtrs_clt_sess *clt)
 		wait_event(clt->permits_wait,
 			   find_first_bit(clt->permits_map, sz) >= sz);
 	}
-	kfree(clt->permits_map);
+	bitmap_free(clt->permits_map);
 	clt->permits_map = NULL;
 	kfree(clt->permits);
 	clt->permits = NULL;