Re: free free irq and Oops on cat /proc/interrupts

[Edgar Toernig]

Manu Abraham wrote:
>
> Can somebody give me a pointer as to what i am possibly doing wrong.
>
> i get a "free free IRQ" on free_irq().. 
>
>[and a kernel oops]

|	if (request_irq(pdev->irq, mantis_pci_irq, SA_SHIRQ | SA_INTERRUPT, 
|						DRIVER_NAME, mantis) < 0) {
|[...]
|	free_irq(pdev->irq, pdev);

The last arg of request_irq and free_irq has to match - it is the id
that distinguishes different users of the same irq.  As there never
was a request_irq with pdev you get that error on free_irq.

The module unload still takes place.  So trying to cat /proc/interrupts
later on will stumble over the still installed handler with the mantis
id - unfortunately, the driver (and especially DRIVER_NAME) is no longer
in memory ...

Ciao, ET.
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