RE: drivers/mtd/onenand/: unacceptable stack usage
From: Kyungmin Park
Date: Thu Dec 15 2005 - 21:16:44 EST
Hi
OK. I change the source code.
It is working well on OMAP H4 with 2.6.15-rc4 kernel and LTP fs test is
passed.
And please apply the recent onenand patch
- check correct manufacturer
- unlock problem in DDP (Double Density Package)
- add platform_device.h instead of device.h
Thank you
Kyungmin Park
1. check correct manufacturer
Index: drivers/mtd/onenand/onenand_base.c
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/onenand/onenand_base.c,v
retrieving revision 1.8
diff -u -p -r1.8 onenand_base.c
--- drivers/mtd/onenand/onenand_base.c 29 Nov 2005 14:49:36 -0000 1.8
+++ drivers/mtd/onenand/onenand_base.c 2 Dec 2005 06:20:29 -0000
@@ -1346,7 +1346,6 @@ static void onenand_print_device_info(in
static const struct onenand_manufacturers onenand_manuf_ids[] = {
{ONENAND_MFR_SAMSUNG, "Samsung"},
- {ONENAND_MFR_UNKNOWN, "Unknown"}
};
/**
@@ -1357,17 +1356,22 @@ static const struct onenand_manufacturer
*/
static int onenand_check_maf(int manuf)
{
+ int size = ARRAY_SIZE(onenand_manuf_ids);
+ char *name;
int i;
- for (i = 0; onenand_manuf_ids[i].id; i++) {
+ for (i = 0; i < size; i++)
if (manuf == onenand_manuf_ids[i].id)
break;
- }
- printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n",
- onenand_manuf_ids[i].name, manuf);
+ if (i < size)
+ name = onenand_manuf_ids[i].name;
+ else
+ name = "Unknown";
+
+ printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name,
manuf);
- return (i != ONENAND_MFR_UNKNOWN);
+ return (i == size);
}
/**
Index: include/linux/mtd/onenand.h
===================================================================
RCS file: /home/cvs/mtd/include/linux/mtd/onenand.h,v
retrieving revision 1.8
diff -u -p -r1.8 onenand.h
--- include/linux/mtd/onenand.h 7 Nov 2005 11:14:55 -0000 1.8
+++ include/linux/mtd/onenand.h 2 Dec 2005 06:20:30 -0000
@@ -140,7 +140,6 @@ struct onenand_chip {
* OneNAND Flash Manufacturer ID Codes
*/
#define ONENAND_MFR_SAMSUNG 0xec
-#define ONENAND_MFR_UNKNOWN 0x00
/**
* struct nand_manufacturers - NAND Flash Manufacturer ID Structure
2. unlock problem in DDP
Index: drivers/mtd/onenand/onenand_base.c
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/onenand/onenand_base.c,v
retrieving revision 1.9
diff -u -p -r1.9 onenand_base.c
--- drivers/mtd/onenand/onenand_base.c 2 Dec 2005 07:43:37 -0000 1.9
+++ drivers/mtd/onenand/onenand_base.c 16 Dec 2005 00:37:59 -0000
@@ -1296,6 +1296,12 @@ static int onenand_unlock(struct mtd_inf
/* Block lock scheme */
for (block = start; block < end; block++) {
+ /* Set block address */
+ value = onenand_block_address(this, block);
+ this->write_word(value, this->base +
ONENAND_REG_START_ADDRESS1);
+ /* Select DataRAM for DDP */
+ value = onenand_bufferram_address(this, block);
+ this->write_word(value, this->base +
ONENAND_REG_START_ADDRESS2);
/* Set start block address */
this->write_word(block, this->base +
ONENAND_REG_START_BLOCK_ADDRESS);
/* Write unlock command */
@@ -1309,10 +1315,6 @@ static int onenand_unlock(struct mtd_inf
& ONENAND_CTRL_ONGO)
continue;
- /* Set block address for read block status */
- value = onenand_block_address(this, block);
- this->write_word(value, this->base +
ONENAND_REG_START_ADDRESS1);
-
/* Check lock status */
status = this->read_word(this->base +
ONENAND_REG_WP_STATUS);
if (!(status & ONENAND_WP_US))
# reduce stack usage
Index: drivers/mtd/onenand/onenand_base.c
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/onenand/onenand_base.c,v
retrieving revision 1.10
diff -u -p -r1.10 onenand_base.c
--- drivers/mtd/onenand/onenand_base.c 16 Dec 2005 00:41:48 -0000 1.10
+++ drivers/mtd/onenand/onenand_base.c 16 Dec 2005 01:45:15 -0000
@@ -940,7 +940,7 @@ static int onenand_writev_ecc(struct mtd
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
/* 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
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, i
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, i
*/
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);
Index: drivers/mtd/onenand/onenand_bbt.c
===================================================================
RCS file: /home/cvs/mtd/drivers/mtd/onenand/onenand_bbt.c,v
retrieving revision 1.1
diff -u -p -r1.1 onenand_bbt.c
--- drivers/mtd/onenand/onenand_bbt.c 27 Sep 2005 10:26:36 -0000 1.1
+++ drivers/mtd/onenand/onenand_bbt.c 16 Dec 2005 01:45:15 -0000
@@ -118,10 +118,10 @@ static int create_bbt(struct mtd_info *m
*/
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);
}
/**
Index: include/linux/mtd/onenand.h
===================================================================
RCS file: /home/cvs/mtd/include/linux/mtd/onenand.h,v
retrieving revision 1.9
diff -u -p -r1.9 onenand.h
--- include/linux/mtd/onenand.h 2 Dec 2005 07:43:38 -0000 1.9
+++ include/linux/mtd/onenand.h 16 Dec 2005 01:45:15 -0000
@@ -17,7 +17,6 @@
#include <linux/mtd/bbm.h>
#define MAX_BUFFERRAM 2
-#define MAX_ONENAND_PAGESIZE (2048 + 64)
/* Scan and identify a OneNAND device */
extern int onenand_scan(struct mtd_info *mtd, int max_chips);
@@ -110,6 +109,7 @@ struct onenand_chip {
spinlock_t chip_lock;
wait_queue_head_t wq;
onenand_state_t state;
+ unsigned char *page_buf;
struct nand_oobinfo *autooob;
@@ -134,7 +134,7 @@ struct onenand_chip {
* Options bits
*/
#define ONENAND_CONT_LOCK (0x0001)
-
+#define ONENAND_PAGEBUF_ALLOC (0x1000)
/*
* OneNAND Flash Manufacturer ID Codes
4. Add platform_device.h instead device.h
diff --git a/drivers/mtd/onenand/generic.c b/drivers/mtd/onenand/generic.c
--- a/drivers/mtd/onenand/generic.c
+++ b/drivers/mtd/onenand/generic.c
@@ -12,9 +12,9 @@
* This is a device driver for the OneNAND flash for generic boards.
*/
-#include <linux/device.h>
#include <linux/module.h>
#include <linux/init.h>
+#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/onenand.h>
#include <linux/mtd/partitions.h>
@@ -39,7 +39,7 @@ static int __devinit generic_onenand_pro
{
struct onenand_info *info;
struct platform_device *pdev = to_platform_device(dev);
- struct onenand_platform_data *pdata = pdev->dev.platform_data;
+ struct flash_platform_data *pdata = pdev->dev.platform_data;
struct resource *res = pdev->resource;
unsigned long size = res->end - res->start + 1;
int err;
--
> -----Original Message-----
> From: Adrian Bunk [mailto:bunk@xxxxxxxxx]
> Sent: Friday, December 16, 2005 9:55 AM
> To: Kyungmin Park
> Cc: dwmw2@xxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx; Linus
> Torvalds; Andrew Morton; linux-kernel@xxxxxxxxxxxxxxx
> Subject: drivers/mtd/onenand/: unacceptable stack usage
>
> In 2.6.15-rc, the following driver was added:
>
>
> include/linux/mtd/onenand.h:
> #define MAX_ONENAND_PAGESIZE (2048 + 64)
>
>
> drivers/mtd/onenand/onenand_base.c:
> static int onenand_writev_ecc(struct mtd_info *mtd, const
> struct kvec *vecs,
> unsigned long count, loff_t to, size_t *retlen,
> u_char *eccbuf, struct nand_oobinfo *oobsel)
> {
> struct onenand_chip *this = mtd->priv;
> unsigned char buffer[MAX_ONENAND_PAGESIZE], *pbuf;
>
>
> drivers/mtd/onenand/onenand_bbt.c:
> static inline int onenand_memory_bbt (struct mtd_info *mtd,
> struct nand_bbt_descr *bd)
> {
> unsigned char data_buf[MAX_ONENAND_PAGESIZE];
>
>
> These are variables on the stack that are > 2kB which is not
> acceptable
> since the complete stack might be only 4kB.
>
>
> Please either fix this before 2.6.15 or mark the MTD_ONENAND
> driver as
> BROKEN until it's fixed.
>
>
> TIA
> Adrian
>
> --
>
> "Is there not promise of rain?" Ling Tan asked suddenly out
> of the darkness. There had been need of rain for many days.
> "Only a promise," Lao Er said.
> Pearl S. Buck - Dragon Seed
>
>
>
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/