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From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 2/3] mtd: mxc-nand: Cleanup code creating bad block table
Date: Tue, 30 Apr 2024 11:44:53 +0200	[thread overview]
Message-ID: <20240430094451.1038256-5-u.kleine-koenig@pengutronix.de> (raw)
In-Reply-To: <20240430094451.1038256-4-u.kleine-koenig@pengutronix.de>

Let the variable "numblocks" contain the number of blocks of the NAND
device (and not twice this value). Also the loop variable counts blocks
now instead of the doubled value. Further calculate the offset of the
i-th block from i instead of incrementing in each step and pick a more
sensbile variable name for it.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/mtd/nand/raw/mxc_nand.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/raw/mxc_nand.c b/drivers/mtd/nand/raw/mxc_nand.c
index da1c426d1951..a72275480144 100644
--- a/drivers/mtd/nand/raw/mxc_nand.c
+++ b/drivers/mtd/nand/raw/mxc_nand.c
@@ -1583,31 +1583,31 @@ static int imxnd_create_bbt(struct nand_chip *chip)
 {
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	int len, i, numblocks, ret;
-	loff_t from = 0;
 	uint8_t *bbt;
 
-	len = mtd->size >> (chip->bbt_erase_shift + 2);
+	numblocks = mtd->size >> chip->bbt_erase_shift;
 
-	/* Allocate memory (2bit per block) and clear the memory bad block table */
+	/*
+	 * Allocate memory (2bit per block = 1 byte per 4 blocks) and clear the
+	 * memory bad block table
+	 */
+	len = (numblocks + 3) >> 2;
 	bbt = kzalloc(len, GFP_KERNEL);
 	if (!bbt)
 		return -ENOMEM;
 
-	numblocks = mtd->size >> (chip->bbt_erase_shift - 1);
+	for (i = 0; i < numblocks; ++i) {
+		loff_t ofs = i << chip->bbt_erase_shift;
 
-	for (i = 0; i < numblocks;) {
-		ret = checkbad(chip, from);
+		ret = checkbad(chip, ofs);
 		if (ret < 0)
 			goto out;
 
 		if (ret) {
-			bbt[i >> 3] |= 0x03 << (i & 0x6);
+			bbt[i >> 2] |= 0x03 << (2 * (i & 0x3));
 			dev_info(mtd->dev.parent, "Bad eraseblock %d at 0x%08x\n",
-				 i >> 1, (unsigned int)from);
+				 i, (unsigned int)ofs);
 		}
-
-		i += 2;
-		from += (1 << chip->bbt_erase_shift);
 	}
 
 	chip->bbt_td->options |= NAND_BBT_CREATE;
-- 
2.43.0




  reply	other threads:[~2024-04-30  9:46 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-30  9:44 [PATCH 1/3] mtd: mxc-nand: Improve comment about vendor BBM and address verschwurbelung Uwe Kleine-König
2024-04-30  9:44 ` Uwe Kleine-König [this message]
2024-04-30  9:44 ` [PATCH 3/3] mtd: mxc-nand: Only automatically create BBT if NAND seems to be pristine Uwe Kleine-König
2024-05-03  7:44   ` Sascha Hauer
2024-05-06  7:23     ` Uwe Kleine-König

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