linux-kernel - Re: Possible bug in 8250.c

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Message-ID: <20110820172156.1ece472c@lxorguk.ukuu.org.uk>
Date:	Sat, 20 Aug 2011 17:21:56 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	mikeci@....org
Cc:	"Jiri Slaby" <jslaby@...e.cz>, <linux-kernel@...r.kernel.org>
Subject: Re: Possible bug in 8250.c

> So in first iteration, interrupt is cleared, and in second, function will execute:
> 
>           } else if (end == NULL)
>                         end = l;
> 
> which will terminate the loop, but the return code will be IRQ_RETVAL(0).

If you are getting an extra IRQ when then chip itself is indicating no
IRQ then the IRQ is spurious. That probably means you have a problem
elsewhere - eg the IRQ controller being misconfigured between level/edge
triggered.

Alan
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