On Fri, 15 Mar 2013, Arnd Bergmann wrote:
> > Instead of adding these tests for non-NULL pdata all over the place,
> > you could define a static structure with default settings and store a
> > pointer to it if pdata wasn't set initially.
>
> Yes, good idea. Here is a new version. Maybe Alexey or Tony can verify if
> that works for them on wm8850. That should be independent of the decision
> into which kernel to merge this patch.
On the whole this looks good (and a lot nicer than the first version).
However there is one bug...
> +static struct usb_ehci_pdata ehci_platform_defaults;
> +
> static int ehci_platform_probe(struct platform_device *dev)
> {
> struct usb_hcd *hcd;
> struct resource *res_mem;
> - struct usb_ehci_pdata *pdata = dev->dev.platform_data;
> + struct usb_ehci_pdata *pdata;
> int irq;
> int err = -ENOMEM;
>
> - if (!pdata) {
> - WARN_ON(1);
> - return -ENODEV;
> - }
> -
> if (usb_disabled())
> return -ENODEV;
>
> + if (!dev->dev.platform_data) {
> + dev->dev.platform_data = &ehci_platform_defaults;
If the ehci-platform module is unloaded and then reloaded at a
different address, the stale pointer will cause an invalid memory
reference. ehci_platform_remove() needs to set dev->dev.platform_data
back to NULL if it is equal to &ehci_platform_defaults.
Once that is fixed, you can add
Acked-by: Alan Stern <[email protected]>
Alan Stern
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