linux-kernel - Re: hisax isdn card (Sedlbauer Speed Fax+) does not get an interrupt

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Message-id: <46642229.6070107@shaw.ca>
Date:	Mon, 04 Jun 2007 08:31:05 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Thomas Voegtle <tv@...96.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: hisax isdn card (Sedlbauer Speed Fax+) does not get an interrupt

Thomas Voegtle wrote:
> Thx for your answer. Unfortunately, it didn't help us yet in finding a fix 
> for the problem.
> 
> The first IRQs are received after the call to pci_enable_device, but 
> before the IRQ handler itself is registered (register_irq). The IRQs seem 
> to be triggered by the write operations to the card registers 
> (byteout()/outb() calls around lines 676ff in sedlbauer.c); the IRQ 
> handler is registered much later, though. The dump above suggests that the 
> kernel relays the interrupts to the USB handler (on the same IRQ) instead 
> - which obviously is wrong.
> 
> In short:
> * pci_enable_device
> * writing to card registers -> triggering interrupts
>   (handler not yet installed -> error)
> * register interrupt -> fails, as it already was disabled due to the 
>   errors
> 
> Again: thx for your comments. Do you have any further ideas/advice on how 
> to get the driver running?

Presumably whatever writes the driver is doing there are enabling the 
card to generate interrupts - in this case the IRQ handler needs to be 
registered before this point, and not after..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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