From: Eric Dumazet <eric.duma...@gmail.com>
Date: Tue, 14 Apr 2015 18:45:00 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> Commit 9a2620c877454 ("bnx2x: prevent WARN during driver unload")
> switched the napi/busy_lock locking mechanism from spin_lock() into
> spin_lock_bh(), breaking inter-operability with netconsole, as netpoll
> disables interrupts prior to calling our napi mechanism.
>
> This switches the driver into using atomic assignments instead of the
> spinlock mechanisms previously employed.
>
> Based on initial patch from Yuval Mintz & Ariel Elior
>
> I basically added softirq starvation avoidance, and mixture
> of atomic operations, plain writes and barriers.
>
> Note this slightly reduces the overhead for this driver when no
> busy_poll sockets are in use.
>
> Fixes: 9a2620c877454 ("bnx2x: prevent WARN during driver unload")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
Applied and queued up for -stable, thanks Eric.
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