scsi: hpsa: 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/5f975ef43f8b7306e4ac4e2e8ce4bcd53f6092bb.1658340441.git.christophe.jaillet@wanadoo.frTested-by: Don Brace <don.brace@microchip.com>
Acked-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hpsa.c

@@ -8030,7 +8030,7 @@ static int hpsa_init_reset_devices(struct pci_dev *pdev, u32 board_id)
 
 static void hpsa_free_cmd_pool(struct ctlr_info *h)
 {
-	kfree(h->cmd_pool_bits);
+	bitmap_free(h->cmd_pool_bits);
 	h->cmd_pool_bits = NULL;
 	if (h->cmd_pool) {
 		dma_free_coherent(&h->pdev->dev,
@@ -8052,9 +8052,7 @@ static void hpsa_free_cmd_pool(struct ctlr_info *h)
 
 static int hpsa_alloc_cmd_pool(struct ctlr_info *h)
 {
-	h->cmd_pool_bits = kcalloc(DIV_ROUND_UP(h->nr_cmds, BITS_PER_LONG),
-				   sizeof(unsigned long),
-				   GFP_KERNEL);
+	h->cmd_pool_bits = bitmap_zalloc(h->nr_cmds, GFP_KERNEL);
 	h->cmd_pool = dma_alloc_coherent(&h->pdev->dev,
 		    h->nr_cmds * sizeof(*h->cmd_pool),
 		    &h->cmd_pool_dhandle, GFP_KERNEL);