tree ca1098636b4918c00a49faf34c4e0d6e99852296
parent 9e3a9d1ed8cc8db93e5c53e9a5b09065bd95de8b
author Holger Macht <hmacht@suse.de> 1232450304 +0100
committer Len Brown <len.brown@intel.com> 1233976095 -0500

ACPI: dock: Don't eval _STA on every show_docked sysfs read

Some devices trigger a DEVICE_CHECK on every evalutation of _STA. This
can also be seen in commit 8b59560a3baf2e7c24e0fb92ea5d09eca92805db
(ACPI: dock: avoid check _STA method).  If an undock is processed, the
dock driver sends a uevent and userspace might read the show_docked
property in sysfs. This causes an evaluation of _STA of the particular
device which causes the dock driver to immediately dock again.

In any case, evaluation of _STA (show_docked) does not necessarily mean
that we are docked, so check with the internal device structure.

http://bugzilla.kernel.org/show_bug.cgi?id=12360

Signed-off-by: Holger Macht <hmacht@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>