linux-kernel - Re: [2.624-rc1 regression] lost battery information

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Message-ID: <4723410E.1010208@gmail.com>
Date:	Sat, 27 Oct 2007 17:45:50 +0400
From:	Alexey Starikovskiy <aystarik@...il.com>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
CC:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Frans Pop <elendil@...net.nl>
Subject: Re: [2.624-rc1 regression] lost battery information

Andrey,
Please try the attached patch. I choose to do snprintf() instead of direct copy,
as your previous message showed empty OEM type.

Thanks,
Alex.
Andrey Borzenkov wrote:
> On Friday 26 October 2007, Alexey Starikovskiy wrote:
>> Your cat's "Bad address" means -EFAULT, according to "man errno".
>> Please apply this patch to see what exactly failed...
> 
> 
> 
> [ 1191.471572] ACPI: element[12]->type = 1, expected string
> [ 1196.640065] ACPI: element[12]->type = 1, expected string
> [ 1199.479773] ACPI: element[12]->type = 1, expected string
> [ 1199.745435] ACPI: element[12]->type = 1, expected string
> 
> it is "OEM type". For reference here is _BIF from my DSDT:
> 
>              Method (_BIF, 0, NotSerialized)
>             {
>                 Name (BUFF, Package (0x0D) {})
>                 Store (0x00, Index (BUFF, 0x00))
>                 Store (\_SB.MEM.BDV2, Local2)
>                 Multiply (\_SB.MEM.BDC2, Local2, Local0)
>                 Divide (Local0, 0x03E8, Local1, Local0)
>                 Store (Local0, Index (BUFF, 0x01))
>                 Multiply (\_SB.MEM.BLF2, Local2, Local0)
>                 Divide (Local0, 0x03E8, Local1, Local0)
>                 Store (Local0, Index (BUFF, 0x02))
>                 Store (\_SB.MEM.BTC2, Index (BUFF, 0x03))
>                 Store (\_SB.MEM.BDV2, Index (BUFF, 0x04))
>                 Multiply (\_SB.MEM.BCW2, Local2, Local0)
>                 Divide (Local0, 0x03E8, Local1, Local0)
>                 Store (Local0, Index (BUFF, 0x05))
>                 Multiply (\_SB.MEM.BCL2, Local2, Local0)
>                 Divide (Local0, 0x03E8, Local1, Local0)
>                 Store (Local0, Index (BUFF, 0x06))
>                 Multiply (\_SB.MEM.BG12, Local2, Local0)
>                 Divide (Local0, 0x03E8, Local1, Local0)
>                 Store (Local0, Index (BUFF, 0x07))
>                 Multiply (\_SB.MEM.BG22, Local2, Local0)
>                 Divide (Local0, 0x03E8, Local1, Local0)
>                 Store (Local0, Index (BUFF, 0x08))
>                 Store (\_SB.MEM.BMN2, Index (BUFF, 0x09))
>                 Store (\_SB.MEM.BSN2, Index (BUFF, 0x0A))
>                 Store (\_SB.MEM.BTP2, Index (BUFF, 0x0B))
>                 Store (\_SB.MEM.BOI2, Index (BUFF, 0x0C))
>                 Return (BUFF)
>             }
> 
> This is behaviour change. Previous battery.c used generic acpi_extract_package 
> which allowed (allows) for object of type integer when string is requested:
> 
>                 case ACPI_TYPE_INTEGER:
>                         switch (format_string[i]) {
>                         case 'N':
>                                 size_required += sizeof(acpi_integer);
>                                 tail_offset += sizeof(acpi_integer);
>                                 break;
>                         case 'S':
>                                 size_required +=
>                                     sizeof(char *) + sizeof(acpi_integer) +
>                                     sizeof(char);
>                                 tail_offset += sizeof(char *);
>                                 break;
> 
> while current battery.c:extract_package fails:
> 
>                 if (offsets[i].mode) {
>                         if (element->type != ACPI_TYPE_STRING &&
>                             element->type != ACPI_TYPE_BUFFER) {
> printk (KERN_ERR PREFIX "element[%d]->type = %x, expected string\n", i, 
> element->type);
>                                 return -EFAULT;
>                         }
> 
> well, while it could be BIOS fault this happily worked before ... This is 
> obviously also the reason why I do not have anything in /sys
> 
> Fans, could you check whether you have the same issue using test patch?


View attachment "battery_allow_extract_string_from_integer.patch" of type "text/x-diff" (1796 bytes)