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Re: [PATCH] Cobalt interrupthandler fix

To: linux-mips@linux-mips.org
Subject: Re: [PATCH] Cobalt interrupthandler fix
From: Greg Lindahl <lindahl@keyresearch.com>
Date: Sun, 2 Feb 2003 13:17:37 -0800
Cc: Karsten Merker <karsten@excalibur.cologne.de>, tom@maisl.net
In-reply-to: <20030124141524.GA685@excalibur.cologne.de>
Mail-followup-to: linux-mips@linux-mips.org, Karsten Merker <karsten@excalibur.cologne.de>, tom@maisl.net
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References: <20030124141524.GA685@excalibur.cologne.de>
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On Fri, Jan 24, 2003 at 03:15:24PM +0100, Karsten Merker wrote:

> the Cobalt NASRaQ (as well as other RaQ models) has the problem of freezing
> when there is activity on the serial port and on the ethernet at the same
> time. Peter de Schrijver has tracked this down to a bug in the interrupt
> handler. The handler currently does not check whether an interrupt is masked
> and calls the handling routine for _every_ interrupt, not only for those
> that are not masked out currently.

While we're at it:

[lindahl@fileserver mips]$ find . -name "*int-hand*" | xargs grep -L CP0_STATUS
./jmr3927/rbhma3100/int-handler.S
./philips/nino/int-handler.S

The philips case seems to have the same bug.

The jmr3927 thingie is hard to understand, so I can't tell if it has
the same bug or not.

-- greg

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