Re: [PATCH 2/3] can: add support for Janz VMOD-ICAN3 IntelligentCAN module

From: Andrew Morton
Date: Thu Apr 01 2010 - 16:04:17 EST

On Mon, 29 Mar 2010 09:58:51 -0700
"Ira W. Snyder" <iws@xxxxxxxxxxxxxxxx> wrote:

> The Janz VMOD-ICAN3 is a MODULbus daughterboard which fits onto any
> MODULbus carrier board. It is an intelligent CAN controller with a
> microcontroller and associated firmware.

A neat-looking driver.

> ...
> + spin_lock_irqsave(&mod->lock, flags);
> ...

It does this rather a lot. it seems to be doing quite a lot of work
under that lock, too - quite a lot of memcpy_toio(), other stuff.

Is there potential here to disable interrupt for too long? Not
possible to use spin_lock_bh() here?

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