xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mtd: nand: fix drivers abusing mtd->priv

Browse Source 
The ->priv field of the mtd_info object attached to a nand_chip device
should point to the nand_chip device. The pxa and cafe drivers are
assigning this field their own private structure, which works fine as long
as the nand_chip field is the first one in the driver private struct but
seems a bit fragile.
Fix that by setting mtd->priv to point the nand_chip field and assigning
chip->priv to the private structure head.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Boris BREZILLON
2015-11-16 14:37:34 +01:00
committed by Brian Norris
parent 064f462632
commit 1d8d8b5c85
2 changed files with 41 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/mtd/nand/pxa3xx_nand.c
View File

@@ -1113,7 +1113,8 @@ static int prepare_set_command(struct pxa3xx_nand_info *info, int command,
static void nand_cmdfunc(struct mtd_info *mtd, unsigned command,
int column, int page_addr)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
int exec_cmd;
@@ -1161,7 +1162,8 @@ static void nand_cmdfunc_extended(struct mtd_info *mtd,
const unsigned command,
int column, int page_addr)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
int exec_cmd, ext_cmd_type;
@@ -1281,7 +1283,7 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd,
struct nand_chip *chip, uint8_t *buf, int oob_required,
int page)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
chip->read_buf(mtd, buf, mtd->writesize);
@@ -1307,7 +1309,8 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd,
static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
char retval = 0xFF;
@@ -1320,7 +1323,8 @@ static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
u16 retval = 0xFFFF;
@@ -1333,7 +1337,8 @@ static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
@@ -1344,7 +1349,8 @@ static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
static void pxa3xx_nand_write_buf(struct mtd_info *mtd,
const uint8_t *buf, int len)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
@@ -1359,7 +1365,8 @@ static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
if (info->need_wait) {
@@ -1565,11 +1572,11 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
static int pxa3xx_nand_scan(struct mtd_info *mtd)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct nand_chip *chip = mtd->priv;
struct pxa3xx_nand_host *host = chip->priv;
struct pxa3xx_nand_info *info = host->info_data;
struct platform_device *pdev = info->pdev;
struct pxa3xx_nand_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct nand_chip *chip = mtd->priv;
int ret;
uint16_t ecc_strength, ecc_step;
@@ -1701,11 +1708,12 @@ static int alloc_nand_resource(struct platform_device *pdev)
host->mtd = mtd;
host->cs = cs;
host->info_data = info;
mtd->priv = host;
mtd->priv = chip;
mtd->dev.parent = &pdev->dev;
/* FIXME: all chips use the same device tree partitions */
nand_set_flash_node(chip, np);
chip->priv = host;
chip->ecc.read_page = pxa3xx_nand_read_page_hwecc;
chip->ecc.write_page = pxa3xx_nand_write_page_hwecc;
chip->controller = &info->controller;