e1000e: fix potential NVM corruption on ICH9 with 8K bank size

The bank offset was being incorrectly calculated on ICH9 parts with a bank
size of 8K (instead of the more common 4K bank) which would cause any NVM
writes to be done on the wrong address after switching from bank 1 to bank
0.  Additionally, assume we are meant to use bank 0 if a valid bank is not
detected, and remove the unnecessary acquisition of the SW/FW/HW semaphore
when writing to the shadow ram version of the NVM image.

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>

1 files changed, 12 insertions, 38 deletions

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index dd61e7e98ddb..99df2abf82a9 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -338,10 +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;
+        u32 gfpreg, sector_base_addr, sector_end_addr;
         u16 i;
 
         /* Can't read flash registers if the register set isn't mapped. */
@@ -375,20 +372,6 @@ 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 */
@@ -1324,7 +1307,7 @@ static s32 e1000_read_nvm_ich8lan(struct e1000_hw *hw, u16 offset, u16 words,
         struct e1000_nvm_info *nvm = &hw->nvm;
         struct e1000_dev_spec_ich8lan *dev_spec = &hw->dev_spec.ich8lan;
         u32 act_offset;
-        s32 ret_val;
+        s32 ret_val = 0;
         u32 bank = 0;
         u16 i, word;
 
@@ -1339,12 +1322,15 @@ static s32 e1000_read_nvm_ich8lan(struct e1000_hw *hw, u16 offset, u16 words,
                 goto out;
 
         ret_val = e1000_valid_nvm_bank_detect_ich8lan(hw, &bank);
-        if (ret_val)
-                goto release;
+        if (ret_val) {
+                hw_dbg(hw, "Could not detect valid bank, assuming bank 0\n");
+                bank = 0;
+        }
 
         act_offset = (bank) ? nvm->flash_bank_size : 0;
         act_offset += offset;
 
+        ret_val = 0;
         for (i = 0; i < words; i++) {
                 if ((dev_spec->shadow_ram) &&
                     (dev_spec->shadow_ram[offset+i].modified)) {
@@ -1359,7 +1345,6 @@ static s32 e1000_read_nvm_ich8lan(struct e1000_hw *hw, u16 offset, u16 words,
                 }
         }
 
-release:
         e1000_release_swflag_ich8lan(hw);
 
 out:
@@ -1610,7 +1595,6 @@ static s32 e1000_write_nvm_ich8lan(struct e1000_hw *hw, u16 offset, u16 words,
 {
         struct e1000_nvm_info *nvm = &hw->nvm;
         struct e1000_dev_spec_ich8lan *dev_spec = &hw->dev_spec.ich8lan;
-        s32 ret_val;
         u16 i;
 
         if ((offset >= nvm->word_size) || (words > nvm->word_size - offset) ||
@@ -1619,17 +1603,11 @@ static s32 e1000_write_nvm_ich8lan(struct e1000_hw *hw, u16 offset, u16 words,
                 return -E1000_ERR_NVM;
         }
 
-        ret_val = e1000_acquire_swflag_ich8lan(hw);
-        if (ret_val)
-                return ret_val;
-
         for (i = 0; i < words; i++) {
                 dev_spec->shadow_ram[offset+i].modified = 1;
                 dev_spec->shadow_ram[offset+i].value = data[i];
         }
 
-        e1000_release_swflag_ich8lan(hw);
-
         return 0;
 }
 
@@ -1670,8 +1648,8 @@ static s32 e1000_update_nvm_checksum_ich8lan(struct e1000_hw *hw)
          */
         ret_val =  e1000_valid_nvm_bank_detect_ich8lan(hw, &bank);
         if (ret_val) {
-                e1000_release_swflag_ich8lan(hw);
-                goto out;
+                hw_dbg(hw, "Could not detect valid bank, assuming bank 0\n");
+                bank = 0;
         }
 
         if (bank == 0) {
@@ -2057,12 +2035,8 @@ static s32 e1000_erase_flash_bank_ich8lan(struct e1000_hw *hw, u32 bank)
                 iteration = 1;
                 break;
         case 2:
-                if (hw->mac.type == e1000_ich9lan) {
-                        sector_size = ICH_FLASH_SEG_SIZE_8K;
-                        iteration = flash_bank_size / ICH_FLASH_SEG_SIZE_8K;
-                } else {
-                        return -E1000_ERR_NVM;
-                }
+                sector_size = ICH_FLASH_SEG_SIZE_8K;
+                iteration = 1;
                 break;
         case 3:
                 sector_size = ICH_FLASH_SEG_SIZE_64K;
@@ -2074,7 +2048,7 @@ static s32 e1000_erase_flash_bank_ich8lan(struct e1000_hw *hw, u32 bank)
 
         /* Start with the base address, then add the sector offset. */
         flash_linear_addr = hw->nvm.flash_base_addr;
-        flash_linear_addr += (bank) ? (sector_size * iteration) : 0;
+        flash_linear_addr += (bank) ? flash_bank_size : 0;
 
         for (j = 0; j < iteration ; j++) {
                 do {