diff options
| author | Lv Zheng <lv.zheng@intel.com> | 2016-08-03 09:00:14 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-20 18:11:04 +0200 |
| commit | eba117fe1c4fa000fdda0199b93010dc01bc294b (patch) | |
| tree | 19b2d95feb1ed073eb85b0da4c68939a7540649c /mm/slab_common.c | |
| parent | 6dda994f9c7886e21bf3aa74bdea68cfc38184ef (diff) | |
| download | linux-stable-eba117fe1c4fa000fdda0199b93010dc01bc294b.tar.gz linux-stable-eba117fe1c4fa000fdda0199b93010dc01bc294b.tar.bz2 linux-stable-eba117fe1c4fa000fdda0199b93010dc01bc294b.zip | |
ACPI / EC: Work around method reentrancy limit in ACPICA for _Qxx
commit e1191bd4f62d9086a1a47adc286e7fcffc1fa55c upstream.
A regression is caused by the following commit:
Commit: 02b771b64b73226052d6e731a0987db3b47281e9
Subject: ACPI / EC: Fix an issue caused by the serialized _Qxx evaluations
In this commit, using system workqueue causes that the maximum parallel
executions of _Qxx can exceed 255. This violates the method reentrancy
limit in ACPICA and generates the following error log:
ACPI Error: Method reached maximum reentrancy limit (255) (20150818/dsmethod-341)
This patch creates a seperate workqueue and limits the number of parallel
_Qxx evaluations down to a configurable value (can be tuned against number
of online CPUs).
Since EC events are handled after driver probe, we can create the workqueue
in acpi_ec_init().
Fixes: 02b771b64b73 (ACPI / EC: Fix an issue caused by the serialized _Qxx evaluations)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=135691
Reported-and-tested-by: Helen Buus <ubuntu@hbuus.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/slab_common.c')
0 files changed, 0 insertions, 0 deletions