Re: [PATCH 5/6] PCI: acpiphp: look _RMV method a bit deeper in the hierarhcy

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Tue, Jun 25, 2013 at 09:15:47PM +0300, Andy Shevchenko wrote:
> On Tue, Jun 25, 2013 at 7:22 PM, Mika Westerberg
> <mika.westerberg@linux.intel.com> wrote:
> 
> > The acpiphp driver finds out whether the device is hotpluggable by checking
> > whether it has _RMV method behind it (and if it returns 1). However, at
> > least Acer Aspire S5 with Thunderbolt host router has this method placed
> > behind device called EPUP (endpoint upstream port?) and not directly behind
> > the root port as can be seen from the ASL code below:
> 
> []
> 
> 
> > +static acpi_status pcihp_evaluate_rmv(acpi_handle handle, u32 lvl,
> > +                                     void *context, void **return_not_used)
> > +{
> > +       unsigned long long *removable = context;
> > +       unsigned long long value;
> > +       acpi_status status;
> > +
> > +       status = acpi_evaluate_integer(handle, "_RMV", NULL, &value);
> > +       if (ACPI_SUCCESS(status) && value) {
> 
> So, there is a chance the caller gets back uninitialized *context.
> Let's assume that is by design.
> 
> > +               *removable = value;
> > +               return AE_CTRL_TERMINATE;
> > +       }
> > +       return AE_OK;
> > +}
> 
> 
> > +static bool pcihp_is_removable(acpi_handle handle, size_t depth)
> > +{
> > +       unsigned long long removable = 0;
> > +       acpi_status status;
> > +
> > +       status = pcihp_evaluate_rmv(handle, 0, &removable, NULL);
> > +       if ((status == AE_CTRL_TERMINATE) && removable)
> 
> Here you already have removable not equal zero.

Hmm, removable is initialized to zero just few lines above... Did I miss
something obvious?

> Internal braces could be removed, but it's up top you.

I'll remove them in the next revision.

Thanks.