From 532a37cf8d05dd1aa5631be836036204b0d2b4a1 Mon Sep 17 00:00:00 2001
From: Kyungmin Park <kyungmin.park@samsung.com>
Date: Fri, 16 Dec 2005 11:17:29 +0900
Subject: [PATCH] mtd onenand driver: reduce stack usage
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
drivers/mtd/onenand/onenand_base.c | 27 ++++++++++++++++++++++++---
drivers/mtd/onenand/onenand_bbt.c | 4 ++--
2 files changed, 26 insertions(+), 5 deletions(-)
(limited to 'drivers')
diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index d57afbaaed..a53a73fc2a 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -940,7 +940,7 @@ static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
u_char *eccbuf, struct nand_oobinfo *oobsel)
{
struct onenand_chip *this = mtd->priv;
- unsigned char buffer[MAX_ONENAND_PAGESIZE], *pbuf;
+ unsigned char *pbuf;
size_t total_len, len;
int i, written = 0;
int ret = 0;
@@ -975,7 +975,7 @@ static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
/* Loop until all keve's data has been written */
len = 0;
while (count) {
- pbuf = buffer;
+ pbuf = this->page_buf;
/*
* If the given tuple is >= pagesize then
* write it out from the iov
@@ -995,7 +995,7 @@ static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
int cnt = 0, thislen;
while (cnt < mtd->oobblock) {
thislen = min_t(int, mtd->oobblock - cnt, vecs->iov_len - len);
- memcpy(buffer + cnt, vecs->iov_base + len, thislen);
+ memcpy(this->page_buf + cnt, vecs->iov_base + len, thislen);
cnt += thislen;
len += thislen;
@@ -1519,6 +1519,18 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
this->read_bufferram = onenand_sync_read_bufferram;
}
+ /* Allocate buffers, if necessary */
+ if (!this->page_buf) {
+ size_t len;
+ len = mtd->oobblock + mtd->oobsize;
+ this->page_buf = kmalloc(len, GFP_KERNEL);
+ if (!this->page_buf) {
+ printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
+ return -ENOMEM;
+ }
+ this->options |= ONENAND_PAGEBUF_ALLOC;
+ }
+
this->state = FL_READY;
init_waitqueue_head(&this->wq);
spin_lock_init(&this->chip_lock);
@@ -1580,12 +1592,21 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
*/
void onenand_release(struct mtd_info *mtd)
{
+ struct onenand_chip *this = mtd->priv;
+
#ifdef CONFIG_MTD_PARTITIONS
/* Deregister partitions */
del_mtd_partitions (mtd);
#endif
/* Deregister the device */
del_mtd_device (mtd);
+
+ /* Free bad block table memory, if allocated */
+ if (this->bbm)
+ kfree(this->bbm);
+ /* Buffer allocated by onenand_scan */
+ if (this->options & ONENAND_PAGEBUF_ALLOC)
+ kfree(this->page_buf);
}
EXPORT_SYMBOL_GPL(onenand_scan);
diff --git a/drivers/mtd/onenand/onenand_bbt.c b/drivers/mtd/onenand/onenand_bbt.c
index f40190f499..4510d3361e 100644
--- a/drivers/mtd/onenand/onenand_bbt.c
+++ b/drivers/mtd/onenand/onenand_bbt.c
@@ -118,10 +118,10 @@ static int create_bbt(struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr
*/
static inline int onenand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd)
{
- unsigned char data_buf[MAX_ONENAND_PAGESIZE];
+ struct onenand_chip *this = mtd->priv;
bd->options &= ~NAND_BBT_SCANEMPTY;
- return create_bbt(mtd, data_buf, bd, -1);
+ return create_bbt(mtd, this->page_buf, bd, -1);
}
/**
--
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