Re: PCI driver

["Antonino A. Daplas" <adaplas@gmail.com>]

Manu Abraham wrote:
> Ralph Metzler wrote:
> 

>                SA_INTERRUPT, DRIVER_NAME, mantis) < 0) {
>        dprintk(verbose, MANTIS_ERROR, 1, "Mantis IRQ reg failed");
>        goto err2;
>    }
>    dprintk(verbose, MANTIS_DEBUG, 1, "We got an IRQ");
>    dprintk(verbose, MANTIS_DEBUG, 1, "We finally enabled the device");
>    pci_set_master(pdev);
>    pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &latency);
>    pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
>    mantis->latency = latency;
>    mantis->revision = revision;
>    if (!latency) {
>        pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 32);
>    }
>    pci_set_drvdata(pdev, mantis);      dprintk(verbose, MANTIS_ERROR, 0,
> "Mantis Rev %d, ", mantis->revision);
>    dprintk(verbose, MANTIS_ERROR, 0, "irq: %d, latency: %d\n \
>        memory: 0x%04x, mmio: %p\n", pdev->irq, mantis->latency,    \
>        mantis->mantis_addr, mantis->mantis_mmio);

Success!  So don't enter the failure path, return 0 here.

>   err2:
>    if (mantis->mantis_mmio)
>        iounmap(mantis->mantis_mmio);
> err1:
>    release_mem_region(pci_resource_start(pdev, 0),
>                pci_resource_len(pdev, 0));
> err0:
>    kfree(mantis);
> err:
>    return 0;

This is your failure path, return nonzero here, preferable describing the
error condition.

Tony