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mtd: fix the conversion from dev to mtd_info

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The patch fixes a bug when converting dev to mtd_info by using the
drvdata of the dev, the previous code used
container_of(dev, struct mtd_info, dev), but won't work for the mtdXro
devices as they created without being contained inside mtd_info structure.

Signed-off-by: Saeed Bishara <saeed@marvell.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Saeed Bishara 2009-07-28 04:56:43 -07:00 committed by David Woodhouse
parent 7699ad35ed
commit 6afc4fdb3e
2 changed files with 5 additions and 4 deletions
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7
drivers/mtd/mtdcore.c
View file

@ -65,8 +65,8 @@ static void mtd_release(struct device *dev)
static int mtd_cls_suspend(struct device *dev, pm_message_t state)
{
struct mtd_info *mtd = dev_to_mtd(dev);
if (mtd->suspend)
if (mtd && mtd->suspend)
return mtd->suspend(mtd);
else
return 0;
@ -76,7 +76,7 @@ static int mtd_cls_resume(struct device *dev)
{
struct mtd_info *mtd = dev_to_mtd(dev);
if (mtd->resume)
if (mtd && mtd->resume)
mtd->resume(mtd);
return 0;
}
@ -298,6 +298,7 @@ int add_mtd_device(struct mtd_info *mtd)
mtd->dev.class = &mtd_class;
mtd->dev.devt = MTD_DEVT(i);
dev_set_name(&mtd->dev, "mtd%d", i);
dev_set_drvdata(&mtd->dev, mtd);
if (device_register(&mtd->dev) != 0) {
mtd_table[i] = NULL;
break;

2
include/linux/mtd/mtd.h
View file

@ -251,7 +251,7 @@ struct mtd_info {
static inline struct mtd_info *dev_to_mtd(struct device *dev)
{
return dev ? container_of(dev, struct mtd_info, dev) : NULL;
return dev ? dev_get_drvdata(dev) : NULL;
}
static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)