Re: [PATCH] ACPI / Battery: Return -ENODATA for unknown values inget_property()

[Sitsofe Wheeler]

On Sun, Oct 17, 2010 at 08:32:42PM +0200, Rafael J. Wysocki wrote:
> 
> Still, if user space has problems with failing reads from the sysfs
> attributes, it may be better to simply put -1 in there.  Patch is
> appended, please test.

This patch does what it says on the tin (returns -1 in sysfs on my EeePC
900). So:

Tested-by: Sitsofe Wheeler <sitsofe@xxxxxxxxx>

It's a shame the previous changes didn't work as they stopped a buggy
upower using the -1 value (and producing a nonsense rate like 8.4e-06)
but it's not clear which part of the stack can't handle -ENODATA
perhaps it is another part of the kernel?

Richard, any chance of upower being changed to test for -1 before doing
doing anything with current_now (
http://cgit.freedesktop.org/DeviceKit/upower/tree/src/linux/up-device-supply.c?id=5387183d53c16a987a0737c1bdec1b62edf3daa6#n561)?
I guess there are a whole bunch of other attributes that could
theoretically be -1 and shouldn't be used if they return it...

-- 
Sitsofe | http://sucs.org/~sits/
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