kern/117591: [acpi][panic] Divide by zero bug in ACPI

[Nate Lawson]

John Baldwin wrote:
> On Monday 19 November 2007 05:40:03 pm Jessica Mahoney wrote:
>>  John Baldwin wrote:
>>  > Can you get a stack trace?
>>  >
>>  >   
>>  Tracing pid 878 tid 100080 td 0xc3f26440
>>  acpi_battery_get_battinfo(c3a27980,c3ee4d00,e51e1c60,c3ee4d00,0,...) at 
>>  acpi_battery_get_battinfo+0x26f
>>  acpi_battery_ioctl(c0a44203,c3ee4d00,0,c40ec880,e51e1c08,...) at 
>>  acpi_battery_ioctl+0x14b
>>  acpiioctl(c3a9e900,c0a44203,c3ee4d00,3,c3f26440,...) at acpiioctl_0xdd
>>  devfs_ioctl_f(c3e35d80,c0a44203,c3ee4d00,c3ee5800,c3f26440,...) at 
>>  devfs_ioctl_f+0xcb
>>  kern_ioctl(c3f26440,3,c0a44203,c3ee4d00,1000a24,..._ at kern_ioctl+0x355
>>  ioctl(c3f26440,e51e1cfc,c,c3f26440,e51e1d2c,...) at ioctl+0x134
>>  syscall(e51e1d38) at syscall+0x345
>>  Xint0x80_syscall() at Xint0x80_syscall+0x20
>>  --- syscall (54, FreeBSD ELF32, ioctl), eip = 0x2815289b, esp = 
>>  0xbfbfec3c, ebp = 0xbfbfed28 ---
>>  
>>  If there's anything else needed, please let me know and I shall provide.
> 
> You can try this:
> 
> Index: acpi_battery.c
> ===================================================================
> RCS file: /usr/cvs/src/sys/dev/acpica/acpi_battery.c,v
> retrieving revision 1.25
> diff -u -r1.25 acpi_battery.c
> --- acpi_battery.c      9 Oct 2007 07:51:46 -0000       1.25
> +++ acpi_battery.c      19 Nov 2007 23:17:48 -0000
> @@ -198,8 +198,10 @@
>          */
>         if (bif->units == ACPI_BIF_UNITS_MA && bif->dvol != 0) {
>             bst[i].rate = (bst[i].rate * bif->dvol) / 1000;
> +#if 0
>             bst[i].cap = (bst[i].cap * bif->dvol) / 1000;
>             bif->lfcap = (bif->lfcap * bif->dvol) / 1000;
> +#endif
>         }
> 
>         /* Calculate percent capacity remaining. */
> 
> I think the mA => mW scaling is resulting in lfcap becoming 0, but since
> all we want is a ratio for 'cap' so we can generate a percentage, we don't 
> actually need to scale this.

I think this was already fixed in RELENG_6, 7, and 8-current.  Can the
submitter cvsup and try again?

-- 
Nate