Re: free free irq and Oops on cat /proc/interrupts (2)

[Sergey Vlasov <vsu@altlinux.ru>]

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On Sat, Sep 17, 2005 at 11:28:39PM +0400, Manu Abraham wrote:
> >Here is the next problem - you must give free_irq() the same pointer
> >that you have passed to request_irq().  So you need a way to get from
> >a struct pci_dev for your device to the corresponding struct
> >mantis_pci.  This is done as follows:
> >
> >1) In your mantis_pci_probe(), when you have initialized the device
> >successfully, put the pointer to you data structure into the PCI
> >device structure:
> >
> >	pci_set_drvdata(pdev, mantis);
> >
> >2) In mantis_pci_remove() (and later in other PCI driver functions,
> >like suspend/resume) get this pointer back:
> >
> >	struct mantis_pci *mantis = pci_get_drvdata(pdev);
> > 
> >
> I had already done this ..

Yes...

> >Then use that pointer where you need it (e.g., in free_irq()).

But not this - which is what really causes the problem.

> static void __devexit mantis_pci_remove(struct pci_dev *pdev)
> {
> 	struct mantis_pci *mantis = pci_get_drvdata(pdev);
> 	if (mantis == NULL) {
> 		dprintk(verbose, MANTIS_ERROR, 1, "Aeio, MAntis NULL ptr");
> 		return;
> 	}
> 	dprintk(verbose, MANTIS_ERROR, 1, "Removing -->Mantis irq: %d, \
> 		latency: %d\n memory: 0x%lx, mmio: 0x%p",
> 		pdev->irq, mantis->latency, mantis->mantis_addr,
> 		mantis->mantis_mmio);
> 
> 	free_irq(pdev->irq, pdev);

This should be

	free_irq(pdev->irq, mantis);

> //	release_mem_region(pci_resource_start(pdev, 0),
> //		pci_resource_len(pdev, 0));
> 	pci_release_regions(pdev);
> 	pci_set_drvdata(pdev, NULL);
> 	pci_disable_device(pdev);
> 	kfree(mantis);
> }

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