bnxt_en: discard out of sequence HWRM responses

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During firmware crash recovery, it is possible for firmware to respond
to stale HWRM commands that have already timed out. Because response
buffers may be reused, any out of sequence responses need to be ignored
and only the matching seq_id should be accepted.

Also, READ_ONCE should be used for the reads from the DMA buffer to
ensure that the necessary loads are scheduled.

Reviewed-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Edwin Peer 2021-08-29 03:35:00 -04:00 • committed by David S. Miller

parent f9ff578251

commit 02b9aa1068

1 changed files with 17 additions and 4 deletions

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21

drivers/net/ethernet/broadcom/bnxt/bnxt_hwrm.c

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