Re: [PATCH 2/4] usb: typec: tcpci_rt1711h: Convert enum->pointer for data in the match tables

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On Mon, Aug 21, 2023 at 03:27:43PM +0200, Geert Uytterhoeven wrote:
> On Mon, Aug 21, 2023 at 3:04 PM Andy Shevchenko
> <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> > On Sun, Aug 20, 2023 at 07:44:00PM +0100, Biju Das wrote:

...

> > For all your work likes this as I noted in the reply to Guenter that
> > the couple of the selling points here are:
> > 1) avoidance of the pointer abuse in OF table
> >    (we need that to be a valid pointer);
> 
> There is no pointer abuse: both const void * (in e.g. of_device_id)
> and kernel_ulong_t (in e.g. i2c_device_id) can be used by drivers
> to store a magic cookie, being either a pointer, or an integer value.
> The same is true for the various unsigned long and void * "driver_data"
> fields in subsystem-specific driver structures.

(void *)5 is the abuse of the pointer.
We carry something which is not a valid pointer from kernel perspective.

-- 
With Best Regards,
Andy Shevchenko





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