From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-2.6 PATCH 4/6] e1000e: prevent NVM corruption on sectors larger than 4K Date: Wed, 01 Jul 2009 16:28:32 -0700 Message-ID: <20090701232832.20555.91938.stgit@localhost.localdomain> References: <20090701232731.20555.63487.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, Bruce Allan , Jeff Kirsher To: davem@davemloft.net Return-path: Received: from qmta15.emeryville.ca.mail.comcast.net ([76.96.27.228]:50198 "EHLO QMTA15.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752983AbZGAX2p (ORCPT ); Wed, 1 Jul 2009 19:28:45 -0400 In-Reply-To: <20090701232731.20555.63487.stgit@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: From: Bruce Allan Limit NVM writes to 4K sections to prevent NVM corruption on larger sector allocations (up to 64K). Signed-off-by: Bruce Allan Signed-off-by: Jeff Kirsher --- drivers/net/e1000e/ich8lan.c | 19 +++++++++++++++++-- 1 files changed, 17 insertions(+), 2 deletions(-) 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 @@ 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;