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SubjectRe: [patch] 2.4.2-pre3: parport_pc init_module bug
On Tue, 13 Feb 2001, Tim Waugh wrote:
> Here's a patch that fixes a bug that can cause PCI driver list
> corruption. If parport_pc's init_module fails after it calls
> pci_register_driver, cleanup_module isn't called and so it's still
> registered when it gets unloaded.

> --- linux/drivers/parport/parport_pc.c.init Tue Feb 13 23:31:25 2001
> +++ linux/drivers/parport/parport_pc.c Tue Feb 13 23:35:56 2001
> @@ -89,6 +89,7 @@
> } superios[NR_SUPERIOS] __devinitdata = { {0,},};
>
> static int user_specified __devinitdata = 0;
> +static int registered_parport;
>
> /* frob_control, but for ECR */
> static void frob_econtrol (struct parport *pb, unsigned char m,
> @@ -2605,6 +2606,7 @@
> count += parport_pc_find_nonpci_ports (autoirq, autodma);
>
> r = pci_register_driver (&parport_pc_pci_driver);
> + registered_parport = 1;
> if (r > 0)
> count += r;

Bad patch. It should be

if (r >= 0) {
registered_parport = 1;
if (r > 0)
count += r;
}
If pci_register_driver returns < 0, the driver is not registered with
the system.

Jeff




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