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>
diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index bf9b97d..0e0755f 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -338,6 +338,7 @@
{
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 @@
/* 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 @@
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 @@
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;