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e1000e: prevent NVM corruption on sectors larger than 4K 

Limit NVM writes to 4K sections to prevent NVM corruption on larger
sector allocations (up to 64K).

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bruce Allan 2009-07-01 13:28:32 +00:00 committed by David S. Miller
parent 60f1292fcb
commit 28c9195a57
1 changed files with 17 additions and 2 deletions
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19
drivers/net/e1000e/ich8lan.c
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@ -338,6 +338,7 @@ static s32 e1000_init_nvm_params_ich8lan(struct e1000_hw *hw)
{
struct e1000_nvm_info *nvm = &hw->nvm;
struct e1000_dev_spec_ich8lan *dev_spec = &hw->dev_spec.ich8lan;
union ich8_hws_flash_status hsfsts;
u32 gfpreg;
u32 sector_base_addr;
u32 sector_end_addr;
@ -374,6 +375,20 @@ static s32 e1000_init_nvm_params_ich8lan(struct e1000_hw *hw)
/* Adjust to word count */
nvm->flash_bank_size /= sizeof(u16);
/*
* Make sure the flash bank size does not overwrite the 4k
* sector ranges. We may have 64k allotted to us but we only care
* about the first 2 4k sectors. Therefore, if we have anything less
* than 64k set in the HSFSTS register, we will reduce the bank size
* down to 4k and let the rest remain unused. If berasesz == 3, then
* we are working in 64k mode. Otherwise we are not.
*/
if (nvm->flash_bank_size > E1000_ICH8_SHADOW_RAM_WORDS) {
hsfsts.regval = er16flash(ICH_FLASH_HSFSTS);
if (hsfsts.hsf_status.berasesz != 3)
nvm->flash_bank_size = E1000_ICH8_SHADOW_RAM_WORDS;
}
nvm->word_size = E1000_ICH8_SHADOW_RAM_WORDS;
/* Clear shadow ram */
@ -1932,7 +1947,7 @@ static s32 e1000_erase_flash_bank_ich8lan(struct e1000_hw *hw, u32 bank)
break;
case 1:
sector_size = ICH_FLASH_SEG_SIZE_4K;
iteration = flash_bank_size / ICH_FLASH_SEG_SIZE_4K;
iteration = 1;
break;
case 2:
if (hw->mac.type == e1000_ich9lan) {
@ -1944,7 +1959,7 @@ static s32 e1000_erase_flash_bank_ich8lan(struct e1000_hw *hw, u32 bank)
break;
case 3:
sector_size = ICH_FLASH_SEG_SIZE_64K;
iteration = flash_bank_size / ICH_FLASH_SEG_SIZE_64K;
iteration = 1;
break;
default:
return -E1000_ERR_NVM;