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| author | Lv Zheng <lv.zheng@intel.com> | 2016-08-03 03:00:14 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-08-04 02:07:53 +0200 |
| commit | e1191bd4f62d9086a1a47adc286e7fcffc1fa55c (patch) | |
| tree | 085e46a8bb91d7d82df91955a4929ffb60599eb9 /arch/x86/lib | |
| parent | ACPI / EC: Remove wrong ECDT correction quirks (diff) | |
| download | linux-e1191bd4f62d9086a1a47adc286e7fcffc1fa55c.tar.xz linux-e1191bd4f62d9086a1a47adc286e7fcffc1fa55c.zip | |
ACPI / EC: Work around method reentrancy limit in ACPICA for _Qxx
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
Cc: 4.3+ <stable@vger.kernel.org> # 4.3+
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>
Diffstat (limited to 'arch/x86/lib')
0 files changed, 0 insertions, 0 deletions