linux-kernel - [PATCH] mtd: gen_probe: Use bitmap

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Date:   Sun, 21 Nov 2021 16:59:12 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] mtd: gen_probe: Use bitmap_zalloc() when applicable

'chip_map' is a bitmap. So use 'bitmap_zalloc()' to simplify code,
improve the semantic and avoid some open-coded arithmetic in allocator
arguments.

Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
consistency.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/mtd/chips/gen_probe.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/mtd/chips/gen_probe.c b/drivers/mtd/chips/gen_probe.c
index e5bd3c2bc3b2..4d4f97841016 100644
--- a/drivers/mtd/chips/gen_probe.c
+++ b/drivers/mtd/chips/gen_probe.c
@@ -61,8 +61,8 @@ static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chi
 	struct cfi_private cfi;
 	struct cfi_private *retcfi;
 	unsigned long *chip_map;
-	int i, j, mapsize;
 	int max_chips;
+	int i, j;
 
 	memset(&cfi, 0, sizeof(cfi));
 
@@ -111,8 +111,7 @@ static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chi
 		max_chips = 1;
 	}
 
-	mapsize = sizeof(long) * DIV_ROUND_UP(max_chips, BITS_PER_LONG);
-	chip_map = kzalloc(mapsize, GFP_KERNEL);
+	chip_map = bitmap_zalloc(max_chips, GFP_KERNEL);
 	if (!chip_map) {
 		kfree(cfi.cfiq);
 		return NULL;
@@ -139,7 +138,7 @@ static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chi
 
 	if (!retcfi) {
 		kfree(cfi.cfiq);
-		kfree(chip_map);
+		bitmap_free(chip_map);
 		return NULL;
 	}
 
@@ -157,7 +156,7 @@ static struct cfi_private *genprobe_ident_chips(struct map_info *map, struct chi
 		}
 	}
 
-	kfree(chip_map);
+	bitmap_free(chip_map);
 	return retcfi;
 }
 
-- 
2.30.2