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e1000: prevent corruption of EEPROM/NVM
Andrey reports e1000 corruption, and that a patch in vmware's ESX fixed it. The EEPROM corruption is triggered by concurrent access of the EEPROM read/write. Putting a lock around it solve the problem. [akpm@linux-foundation.org: use DEFINE_SPINLOCK to avoid confusing lockdep] Signed-off-by: Christopher Li <chrisl@vmware.com> Reported-by: Andrey Borzenkov <arvidjaar@mail.ru> Cc: Zach Amsden <zach@vmware.com> Cc: Pratap Subrahmanyam <pratap@vmware.com> Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Cc: Jesse Brandeburg <jesse.brandeburg@intel.com> Cc: Bruce Allan <bruce.w.allan@intel.com> Cc: PJ Waskiewicz <peter.p.waskiewicz.jr@intel.com> Cc: John Ronciak <john.ronciak@intel.com> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -144,6 +144,8 @@ static s32 e1000_host_if_read_cookie(struct e1000_hw *hw, u8 *buffer);
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static u8 e1000_calculate_mng_checksum(char *buffer, u32 length);
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static s32 e1000_configure_kmrn_for_10_100(struct e1000_hw *hw, u16 duplex);
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static s32 e1000_configure_kmrn_for_1000(struct e1000_hw *hw);
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static s32 e1000_do_read_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data);
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static s32 e1000_do_write_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data);
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/* IGP cable length table */
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static const
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@ -168,6 +170,8 @@ u16 e1000_igp_2_cable_length_table[IGP02E1000_AGC_LENGTH_TABLE_SIZE] =
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83, 89, 95, 100, 105, 109, 113, 116, 119, 122, 124,
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104, 109, 114, 118, 121, 124};
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static DEFINE_SPINLOCK(e1000_eeprom_lock);
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/******************************************************************************
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* Set the phy type member in the hw struct.
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*
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@ -4903,6 +4907,15 @@ static s32 e1000_spi_eeprom_ready(struct e1000_hw *hw)
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* words - number of words to read
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*****************************************************************************/
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s32 e1000_read_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
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{
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s32 ret;
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spin_lock(&e1000_eeprom_lock);
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ret = e1000_do_read_eeprom(hw, offset, words, data);
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spin_unlock(&e1000_eeprom_lock);
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return ret;
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}
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static s32 e1000_do_read_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
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{
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struct e1000_eeprom_info *eeprom = &hw->eeprom;
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u32 i = 0;
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@ -5235,6 +5248,16 @@ s32 e1000_update_eeprom_checksum(struct e1000_hw *hw)
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* EEPROM will most likely contain an invalid checksum.
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*****************************************************************************/
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s32 e1000_write_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
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{
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s32 ret;
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spin_lock(&e1000_eeprom_lock);
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ret = e1000_do_write_eeprom(hw, offset, words, data);
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spin_unlock(&e1000_eeprom_lock);
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return ret;
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}
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static s32 e1000_do_write_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
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{
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struct e1000_eeprom_info *eeprom = &hw->eeprom;
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s32 status = 0;
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