linux-kernel - RE: [PATCH] ACPI / OSL: Fix a regression by returning table size via acpi_get_table_with

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Date:   Fri, 9 Dec 2016 06:09:16 +0000
From:   "Zheng, Lv" <lv.zheng@...el.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Brown, Len" <len.brown@...el.com>, Lv Zheng <zetalog@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "Williams, Dan J" <dan.j.williams@...el.com>
Subject: RE: [PATCH] ACPI / OSL: Fix a regression by returning table size
 via acpi_get_table_with_size()

Hi, Rafael

> From: rjwysocki@...il.com [mailto:rjwysocki@...il.com] On Behalf Of Rafael J. Wysocki
> Subject: Re: [PATCH] ACPI / OSL: Fix a regression by returning table size via
> acpi_get_table_with_size()
> 
> On Fri, Dec 9, 2016 at 3:21 AM, Lv Zheng <lv.zheng@...el.com> wrote:
> > The returned size is still used by the drivers.
> >
> > Reported-by: Dan Williams <dan.j.williams@...el.com>
> > Cc: Dan Williams <dan.j.williams@...el.com>
> > Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> > ---
> >  drivers/acpi/osl.c |    8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> > index 5bef0f65..adf1ec4 100644
> > --- a/drivers/acpi/osl.c
> > +++ b/drivers/acpi/osl.c
> > @@ -445,8 +445,12 @@ void __ref acpi_os_unmap_memory(void *virt, acpi_size size)
> >
> >         status = acpi_get_table(signature, instance, out_table);
> >         if (ACPI_SUCCESS(status)) {
> > -               /* No longer used by early_acpi_os_unmap_memory() */
> > -               *tbl_size = 0;
> > +               /*
> > +                * No longer used by early_acpi_os_unmap_memory(), but still
> > +                * used by the ACPI table drivers.
> > +                */
> > +               if (*out_table)
> > +                       *tbl_size = (*out_table)->length;
> >         }
> >
> >         return (status);
> > --
> 
> The changelog doesn't explain anything.  Please say (a) what the
> problem is and (b) how it is being addressed by your patch.

OK, I'll also add fixes tag to it.

Thanks
Lv