linux-kernel - Re: [PATCH 1/3] hpet: convert to PNP driver

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Message-ID: <3055132f1003171518o46c4712bk5089a7bab8574019@mail.gmail.com>
Date:	Wed, 17 Mar 2010 15:18:27 -0700
From:	Venkatesh Pallipadi <venki@...gle.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Clemens Ladisch <clemens@...isch.de>, linux-acpi@...r.kernel.org,
	Vojtech Pavlik <vojtech@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] hpet: convert to PNP driver

On Wed, Mar 17, 2010 at 10:35 AM, Bjorn Helgaas <bjorn.helgaas@...com> wrote:
>
> PNPACPI already parses _CRS, and does a more complete job than we did here,
> so let's just take advantage of that.
>

Patch looks good.
One comment is that we now have a dependency on CONFIG_PNP. That
probably needs to be added in drivers/char/Kconfig. But, that also
means we may fail for users who do not have PNP in their config today.
May be just select PNP when HPET is selected?

> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@...com>
> ---
>
>  drivers/char/hpet.c |  103 +++++++++++++--------------------------------------
>  1 files changed, 27 insertions(+), 76 deletions(-)
>
>
>
> -       if (!data.hd_address || !data.hd_nirqs) {
> -               printk("%s: no address or irqs in _CRS\n", __func__);
> -               return -ENODEV;
> -       }
> +       data.hd_address = ioremap(mem->start, resource_size(mem));
>
>        return hpet_alloc(&data);
>  }

Not a problem with this patch. But, don't we have a problem of rogue
ioremap when hpet_alloc() fails here?

Thanks,
Venki
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