Re: [PATCH 1/2 2.6] e100: fix NAPI race with watchdog

[James Chapman <jchapman@xxxxxxxxxxx>]

> While polling in NAPI mode, we were occassionally getting interrupts
> re-enabled by the watchdog trying to generate a software interrupt.
> Fix is to add a spinlock around that shared hardware register to
> allow a read-modify-write operation.  This was nasty nasty.  I don't
> like the spinlock in the hot path but i see no other way.  Comments
> are welcome.

While working with NAPI on the e100 a while ago, I seriously
considered removing the generation of the sw interrupt altogether for
the NAPI case. Does it serve any purpose? NAPI is polling the driver
already anyway.

/james