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.

[[email protected]: use DEFINE_SPINLOCK to avoid confusing lockdep]
Signed-off-by: Christopher Li <[email protected]>
Reported-by: Andrey Borzenkov <[email protected]>
Cc: Zach Amsden <[email protected]>
Cc: Pratap Subrahmanyam <[email protected]>
Cc: Jeff Kirsher <[email protected]>
Cc: Jesse Brandeburg <[email protected]>
Cc: Bruce Allan <[email protected]>
Cc: PJ Waskiewicz <[email protected]>
Cc: John Ronciak <[email protected]>
Cc: Jeff Garzik <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Jeff Garzik <[email protected]>

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