linux-kernel - Re: [PATCH 1/2] scsi: hpsa: Use the bitmap API to allocate bitmaps

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Date:   Tue, 2 Aug 2022 20:55:35 +0000
From:   <Don.Brace@...rochip.com>
To:     <christophe.jaillet@...adoo.fr>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>
CC:     <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>,
        <storagedev@...rochip.com>, <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH 1/2] scsi: hpsa: Use the bitmap API to allocate bitmaps

From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Sent: Wednesday, July 20, 2022 1:13 PM
To: Don Brace - C33706 <Don.Brace@...rochip.com>; James E.J. Bottomley <jejb@...ux.ibm.com>; Martin K. Petersen <martin.petersen@...cle.com>
Cc: linux-kernel@...r.kernel.org <linux-kernel@...r.kernel.org>; kernel-janitors@...r.kernel.org <kernel-janitors@...r.kernel.org>; Christophe JAILLET <christophe.jaillet@...adoo.fr>; storagedev <storagedev@...rochip.com>; linux-scsi@...r.kernel.org <linux-scsi@...r.kernel.org>
Subject: [PATCH 1/2] 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.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

Acked-by: Don Brace <don.brace@...rochip.com>
Tested-by: Don Brace <don.brace@...rochip.com>

We normally do not make changes to this driver anymore. But the change looks good.
Thanks for your patch. No cover letter to Ack both at the same time.

Don
---
 drivers/scsi/hpsa.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index a47bcce3c9c7..0612ca681200 100644
--- a/drivers/scsi/hpsa.c
+++ b/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);
--
2.34.1