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mtd: nand: create a helper verification function

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... verification for 'nand_erase_nand'

These checks are expected to be used by 'nand_lock' and 'nand_unlock'
routines too. As all these three are block aligned operations.
So, creating a helper function for this makes sense.

Signed-off-by: Vimal Singh <vimalsingh@ti.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Vimal Singh 2010-02-03 14:12:24 +05:30 • committed by David Woodhouse
parent 91f8026603
commit 6fe5a6acdc
1 changed files with 30 additions and 18 deletions
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48
drivers/mtd/nand/nand_base.c
View file

@ -108,6 +108,35 @@ static int nand_do_write_oob(struct mtd_info *mtd, loff_t to,
*/ */
DEFINE_LED_TRIGGER(nand_led_trigger); DEFINE_LED_TRIGGER(nand_led_trigger);
static int check_offs_len(struct mtd_info *mtd,
loff_t ofs, uint64_t len)
{
struct nand_chip *chip = mtd->priv;
int ret = 0;
/* Start address must align on block boundary */
if (ofs & ((1 << chip->phys_erase_shift) - 1)) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Unaligned address\n", __func__);
ret = -EINVAL;
}
/* Length must align on block boundary */
if (len & ((1 << chip->phys_erase_shift) - 1)) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Length not block aligned\n",
__func__);
ret = -EINVAL;
}
/* Do not allow past end of device */
if (ofs + len > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Past end of device\n",
__func__);
ret = -EINVAL;
}
return ret;
}
/** /**
* nand_release_device - [GENERIC] release chip * nand_release_device - [GENERIC] release chip
* @mtd: MTD device structure * @mtd: MTD device structure
@ -2293,25 +2322,8 @@ int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
__func__, (unsigned long long)instr->addr, __func__, (unsigned long long)instr->addr,
(unsigned long long)instr->len); (unsigned long long)instr->len);
/* Start address must align on block boundary */ if (check_offs_len(mtd, instr->addr, instr->len))
if (instr->addr & ((1 << chip->phys_erase_shift) - 1)) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Unaligned address\n", __func__);
return -EINVAL; return -EINVAL;
}
/* Length must align on block boundary */
if (instr->len & ((1 << chip->phys_erase_shift) - 1)) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Length not block aligned\n",
__func__);
return -EINVAL;
}
/* Do not allow erase past end of device */
if ((instr->len + instr->addr) > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL0, "%s: Erase past end of device\n",
__func__);
return -EINVAL;
}
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN; instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;