Merge branch 'qlcnic'

Himanshu Madhani says:

====================
This series contains following patches

o in v2 series, we received feedback on return codes to use standard error
  codes instead of mixing custom error codes. We have modified patch for
  loopback diagnostic test to return standard error codes.

o rest of the 3 patches in the series are for mailbox refactoring

  Current driver-firmware mailbox interface was operating in polling mode
  because of some limitations with the earlier versions of 83xx adapter
  firmware. These issues are resolved now and we are implementing the
  mailbox interface in interrupt mode.

  There are three patches which refactors mailbox handling:
  * Interrupt mode mailbox implantation.
  * Replace poll mode mailbox interfaces with interrupt mode interfaces.
  * Operate mailbox in poll mode when interrupts are not available.

changes from v2 -> v3
 * Addressed review feedback to use standard return codes for loopback
   diagnostic test.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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