linux-kernel - Re: [PATCH v2] ACPI: add support for CSRT table

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Message-ID: <20130117045035.GN2239@intel.com>
Date:	Thu, 17 Jan 2013 06:50:35 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ACPI: add support for CSRT table

On Thu, Jan 17, 2013 at 12:27:32AM +0100, Rafael J. Wysocki wrote:
> > +static int __init acpi_csrt_init(void)
> > +{
> > +	struct acpi_csrt_group *grp, *end;
> > +	struct acpi_table_csrt *csrt;
> > +	acpi_status status;
> > +	int ret;
> > +
> > +	status = acpi_get_table(ACPI_SIG_CSRT, 0,
> > +				(struct acpi_table_header **)&csrt);
> > +	if (ACPI_FAILURE(status)) {
> > +		if (status == AE_NOT_FOUND)
> > +			return -ENOENT;
> > +		return -EINVAL;
> > +	}
> > +
> > +	pr_debug("parsing CSRT table for devices\n");
> > +
> > +	grp = (struct acpi_csrt_group *)(csrt + 1);
> > +	end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length);
> > +
> > +	while (grp < end) {
> > +		ret = acpi_csrt_parse_resource_group(grp);
> > +		if (ret)
> > +			return ret;
> > +
> > +		grp = (struct acpi_csrt_group *)((void *)grp + grp->length);
> > +	}
> > +
> > +	return 0;
> > +}
> > +subsys_initcall(acpi_csrt_init);
> 
> -> Do we really need a separate initcall for that?  And what if ACPI is
> disabled?

Ah, good point - ACPI can be disabled at runtime as well.

> Perhaps it would be better to call acpi_csrt_init() directly from
> acpi_init() (or from acpi_scan_init() whichever is more suitable)?

Indeed. I'll fix this up and send you a new version soon.

Thanks.
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