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Message-ID: <1353307410-17529-1-git-send-email-b32955@freescale.com>
Date: Mon, 19 Nov 2012 14:43:29 +0800
From: Huang Shijie <b32955@...escale.com>
To: <dwmw2@...radead.org>
CC: <dedekind1@...il.com>, <linux-mtd@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, Huang Shijie <b32955@...escale.com>
Subject: [PATCH 1/2] mtd: remove the de-select chip code in nand_release_device()
The nand_get_device() does not select the chip, but nand_release_device()
does de-select the chip. It is really strange.
With the current code, nand_sync() will de-select the chip, even if the chip
has never been selected.
To make the balance of select/de-select chip, it's better to remove the
de-select chip code in nand_release_device() which makes the code more
clear.
Signed-off-by: Huang Shijie <b32955@...escale.com>
---
drivers/mtd/nand/nand_base.c | 35 +++++++++++++++++++++++++----------
1 files changed, 25 insertions(+), 10 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 6eef7fb..861a87d 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -130,15 +130,12 @@ static int check_offs_len(struct mtd_info *mtd,
* nand_release_device - [GENERIC] release chip
* @mtd: MTD device structure
*
- * Deselect, release chip lock and wake up anyone waiting on the device.
+ * Release chip lock and wake up anyone waiting on the device.
*/
static void nand_release_device(struct mtd_info *mtd)
{
struct nand_chip *chip = mtd->priv;
- /* De-select the NAND device */
- chip->select_chip(mtd, -1);
-
/* Release the controller and the chip */
spin_lock(&chip->controller->lock);
chip->controller->active = NULL;
@@ -333,8 +330,10 @@ static int nand_block_bad(struct mtd_info *mtd, loff_t ofs, int getchip)
i++;
} while (!res && i < 2 && (chip->bbt_options & NAND_BBT_SCAN2NDPAGE));
- if (getchip)
+ if (getchip) {
+ chip->select_chip(mtd, -1);
nand_release_device(mtd);
+ }
return res;
}
@@ -952,6 +951,7 @@ int nand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
ret = __nand_unlock(mtd, ofs, len, 0);
out:
+ chip->select_chip(mtd, -1);
nand_release_device(mtd);
return ret;
@@ -1016,6 +1016,7 @@ int nand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
ret = __nand_unlock(mtd, ofs, len, 0x1);
out:
+ chip->select_chip(mtd, -1);
nand_release_device(mtd);
return ret;
@@ -1552,6 +1553,7 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from,
chip->select_chip(mtd, chipnr);
}
}
+ chip->select_chip(mtd, -1);
ops->retlen = ops->len - (size_t) readlen;
if (oob)
@@ -1806,6 +1808,7 @@ static int nand_do_read_oob(struct mtd_info *mtd, loff_t from,
chip->select_chip(mtd, chipnr);
}
}
+ chip->select_chip(mtd, -1);
ops->oobretlen = ops->ooblen - readlen;
@@ -2188,8 +2191,10 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
chip->select_chip(mtd, chipnr);
/* Check, if it is write protected */
- if (nand_check_wp(mtd))
- return -EIO;
+ if (nand_check_wp(mtd)) {
+ ret = -EIO;
+ goto err_out;
+ }
realpage = (int)(to >> chip->page_shift);
page = realpage & chip->pagemask;
@@ -2201,8 +2206,10 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
chip->pagebuf = -1;
/* Don't allow multipage oob writes with offset */
- if (oob && ops->ooboffs && (ops->ooboffs + ops->ooblen > oobmaxlen))
- return -EINVAL;
+ if (oob && ops->ooboffs && (ops->ooboffs + ops->ooblen > oobmaxlen)) {
+ ret = -EINVAL;
+ goto err_out;
+ }
while (1) {
int bytes = mtd->writesize;
@@ -2253,6 +2260,9 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
ops->retlen = ops->len - writelen;
if (unlikely(oob))
ops->oobretlen = ops->ooblen;
+
+err_out:
+ chip->select_chip(mtd, -1);
return ret;
}
@@ -2379,8 +2389,10 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1);
/* Check, if it is write protected */
- if (nand_check_wp(mtd))
+ if (nand_check_wp(mtd)) {
+ chip->select_chip(mtd, -1);
return -EROFS;
+ }
/* Invalidate the page cache, if we write to the cached page */
if (page == chip->pagebuf)
@@ -2393,6 +2405,8 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
else
status = chip->ecc.write_oob(mtd, chip, page & chip->pagemask);
+ chip->select_chip(mtd, -1);
+
if (status)
return status;
@@ -2625,6 +2639,7 @@ erase_exit:
ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
/* Deselect and wake up anyone waiting on the device */
+ chip->select_chip(mtd, -1);
nand_release_device(mtd);
/* Do call back function */
--
1.7.0.4
--
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