linux-kernel - Re: [PATCH 6/8] SFI: add ACPI extensions

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Message-ID: <87my7z16u5.fsf@basil.nowhere.org>
Date:	Tue, 23 Jun 2009 14:18:42 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Len Brown <lenb@...nel.org>
Cc:	sfi-devel@...plefirmware.org, linux-kernel@...r.kernel.org,
	Feng Tang <feng.tang@...el.com>,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 6/8] SFI: add ACPI extensions

Len Brown <lenb@...nel.org> writes:
>
> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
> index 646d39c..921746f 100644
> --- a/drivers/acpi/tables.c
> +++ b/drivers/acpi/tables.c
> @@ -277,6 +277,9 @@ int __init acpi_table_parse(char *id, acpi_table_handler handler)
>  	struct acpi_table_header *table = NULL;
>  	acpi_size tbl_size;
>  
> +	if (acpi_disabled)
> +		return 1;
> +

This seems like a weird place to hook this in. Shouldn't that be somewhere else, more
high level?


> +#include <linux/acpi.h>
> +#include <linux/kernel.h>
> +#include <linux/sfi.h>
> +#include "sfi_core.h"
> +
> +#undef PREFIX

Nobody should set PREFIX in headers? If they do better fix the headers.


> + * sfi_acpi_parse_xsdt()
> + *
> + * Parse the ACPI XSDT for later access by sfi_acpi_table_parse().
> + */
> +static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *table)
> +{
> +	int num_entries, i;
> +
> +	struct acpi_table_xsdt *xsdt = (struct acpi_table_xsdt *) table;
> +
> +	BUG_ON(!xsdt);


Seems like a pointless BUG_ON, the NULL pointer reference next to it is
obvious enough.

> +
> +	num_entries = (xsdt->header.length - sizeof(struct acpi_table_header) /
> +		sizeof(u64));
> +
> +	pr_debug(PREFIX "XSDT has %d entries\n", num_entries);
> +
> +	for (i = 0; i < num_entries; i++)
> +		sfi_tb_install_table(xsdt->table_offset_entry[i], SFI_ACPI_TABLE);

Shouldn't this have some more sanity checking, e.g. for overflows?


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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