Re: PCMCIA driver resource allocation

From: Bjorn Helgaas
Date: Mon Oct 22 2007 - 11:28:36 EST


On Friday 19 October 2007 04:40:22 pm Russell King wrote:
> On Fri, Oct 19, 2007 at 10:51:51AM -0600, Bjorn Helgaas wrote:

> > + priv->io_resource = request_region(link->io.BasePort1,
> > + link->io.NumPorts1, DRIVER_NAME);
> > + if (!priv->io_resource)
> > + goto cs_failed;
> > mem = ioport_map(link->io.BasePort1, link->io.NumPorts1);
> > if (!mem)
> > goto cs_failed;
> > @@ -366,6 +370,10 @@
> > pcmcia_disable_device(link);
> > if (priv->hw.iobase)
> > ioport_unmap(priv->hw.iobase);
> > + if (priv->io_resource) {
> > + release_resource(priv->io_resource);
> > + priv->io_resource = NULL;
>
> Wrong function. release_resource() doesn't pair with request_region().
> request_region() allocates memory for the struct resource.
> release_resource() merely removes the struct resource from the tree.
> release_region() on the other hand removes the struct resource and
> frees it.

Oh, thanks! I didn't notice that difference between release_region()
and release_resource(). I'll fix the patch.

Bjorn


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