linux-kernel - Re: [PATCH] PNPACPI: check return value of pnpacpi_parse_allocated_resource() and pnpacpi_parse_resource_option

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Message-ID: <CAJFMrCEBmHbWznsfwtmk89zdrHiUveOZqL8Da=FvyN3GWQUraA@mail.gmail.com>
Date:	Thu, 24 Jul 2014 01:19:12 +0530
From:	Arjun Sreedharan <arjun024@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PNPACPI: check return value of pnpacpi_parse_allocated_resource()
 and pnpacpi_parse_resource_option_data()

On 23 July 2014 17:06, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Wednesday, July 23, 2014 01:56:36 PM Arjun wrote:
>> ACPI 5.0 resource types like FixedDMA will fail pnpacpi_allocated_resource().
>> pnpacpi_add_device() has to return error in that case.
>
> Why?
>

OK. I presume that for unsupported types like ACPI_RESOURCE_TYPE_FIXED_DMA
pnpacpi_set_resources() will fail.

>> On 23 July 2014 03:42, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> > On Wednesday, July 23, 2014 12:43:39 AM Arjun Sreedharan wrote:
>> >> Handle error condition since pnpacpi_parse_allocated_resource() and pnpacpi_parse_resource_option_data() could return -EPERM.
>> >>
>> >> Signed-off-by: Arjun Sreedharan <arjun024@...il.com>
>> >
>> > I wonder if this fixes any functional issue you've seen or someone has
>> > reported to you or it's just an "Oh, we probably should handle the return
>> > values here" kind of thing?
>> >
>> >> ---
>> >>  drivers/pnp/pnpacpi/core.c | 8 ++++++--
>> >>  1 file changed, 6 insertions(+), 2 deletions(-)
>> >>
>> >> diff --git a/drivers/pnp/pnpacpi/core.c b/drivers/pnp/pnpacpi/core.c
>> >> index b81448b..c3214e9 100644
>> >> --- a/drivers/pnp/pnpacpi/core.c
>> >> +++ b/drivers/pnp/pnpacpi/core.c
>> >> @@ -272,10 +272,14 @@ static int __init pnpacpi_add_device(struct acpi_device *device)
>> >>               strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
>> >>
>> >>       if (dev->active)
>> >> -             pnpacpi_parse_allocated_resource(dev);
>> >> +             error = pnpacpi_parse_allocated_resource(dev);
>> >> +             if (error)
>> >> +                     return error;
>> >>
>> >>       if (dev->capabilities & PNP_CONFIGURABLE)
>> >> -             pnpacpi_parse_resource_option_data(dev);
>> >> +             error = pnpacpi_parse_resource_option_data(dev);
>> >> +             if (error)
>> >> +                     return error;
>> >>
>> >>       list_for_each_entry(id, &device->pnp.ids, list) {
>> >>               if (!strcmp(id->id, pnpid))
>> >>
>> >
>> > --
>> > I speak only for myself.
>> > Rafael J. Wysocki, Intel Open Source Technology Center.
>
> --
> I speak only for myself.
> Rafael J. Wysocki, Intel Open Source Technology Center.
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