From: Martin Mares <mj@ucw.cz>
To: "Mohamed Ghouse , Gurgaon" <MohamedG@ggn.hcltech.com>
Cc: "Linux-Kernel (E-mail)" <linux-kernel@vger.kernel.org>
Subject: Re: Interrupt Sharing
Date: Wed, 25 Sep 2002 10:37:46 +0200 [thread overview]
Message-ID: <20020925083746.GA845@ucw.cz> (raw)
In-Reply-To: <5F0021EEA434D511BE7300D0B7B6AB53050A4C9D@mail2.ggn.hcltech.com>
Hello!
> But what if two PCI Devices are sharing the same interrupt line?
> Then how does the handler handle this?
> Can you please explain this handling by the Kernel?
All drivers register their interrupt handlers by calling request_irq().
When a shared interrupt arrives, all handlers for this interrupt are
run and each of them polls the status register of the device it handles
to see whether this device needs servicing.
Have a nice fortnight
--
Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
Why is it called "common sense" when nobody seems to have any?
next prev parent reply other threads:[~2002-09-25 8:32 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-24 21:40 Interrupt Sharing Mohamed Ghouse , Gurgaon
2002-09-25 5:09 ` Zwane Mwaikambo
2002-09-25 8:37 ` Martin Mares [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-09-24 21:19 Mohamed Ghouse , Gurgaon
2002-09-24 21:25 ` Robert Love
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