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e1000: prevent corruption of EEPROM/NVM

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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>
This commit is contained in:
Christopher Li 2008-09-05 14:04:05 -07:00 committed by Jeff Garzik
parent f55c21fd9a
commit 78566fecbb
1 changed files with 23 additions and 0 deletions
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23
drivers/net/e1000/e1000_hw.c
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@ -144,6 +144,8 @@ static s32 e1000_host_if_read_cookie(struct e1000_hw *hw, u8 *buffer);
static u8 e1000_calculate_mng_checksum(char *buffer, u32 length);
static s32 e1000_configure_kmrn_for_10_100(struct e1000_hw *hw, u16 duplex);
static s32 e1000_configure_kmrn_for_1000(struct e1000_hw *hw);
static s32 e1000_do_read_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data);
static s32 e1000_do_write_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data);
/* IGP cable length table */
static const
@ -168,6 +170,8 @@ u16 e1000_igp_2_cable_length_table[IGP02E1000_AGC_LENGTH_TABLE_SIZE] =
83, 89, 95, 100, 105, 109, 113, 116, 119, 122, 124,
104, 109, 114, 118, 121, 124};
static DEFINE_SPINLOCK(e1000_eeprom_lock);
/******************************************************************************
* Set the phy type member in the hw struct.
*
@ -4903,6 +4907,15 @@ static s32 e1000_spi_eeprom_ready(struct e1000_hw *hw)
* words - number of words to read
*****************************************************************************/
s32 e1000_read_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
s32 ret;
spin_lock(&e1000_eeprom_lock);
ret = e1000_do_read_eeprom(hw, offset, words, data);
spin_unlock(&e1000_eeprom_lock);
return ret;
}
static s32 e1000_do_read_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
struct e1000_eeprom_info *eeprom = &hw->eeprom;
u32 i = 0;
@ -5235,6 +5248,16 @@ s32 e1000_update_eeprom_checksum(struct e1000_hw *hw)
* EEPROM will most likely contain an invalid checksum.
*****************************************************************************/
s32 e1000_write_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
s32 ret;
spin_lock(&e1000_eeprom_lock);
ret = e1000_do_write_eeprom(hw, offset, words, data);
spin_unlock(&e1000_eeprom_lock);
return ret;
}
static s32 e1000_do_write_eeprom(struct e1000_hw *hw, u16 offset, u16 words, u16 *data)
{
struct e1000_eeprom_info *eeprom = &hw->eeprom;
s32 status = 0;