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| author | Tejun Heo <tj@kernel.org> | 2016-09-05 14:38:13 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-09-05 15:07:53 +0200 |
| commit | c86d06ba2818c5126078cb0cf4e0175ec381045b (patch) | |
| tree | 52f90ab2cbd248e6d958de791671ee4aa78d90a8 /kernel/power/qos.c | |
| parent | Linux 4.8-rc5 (diff) | |
| download | linux-c86d06ba2818c5126078cb0cf4e0175ec381045b.tar.xz linux-c86d06ba2818c5126078cb0cf4e0175ec381045b.zip | |
PM / QoS: avoid calling cancel_delayed_work_sync() during early boot
of_clk_init() ends up calling into pm_qos_update_request() very early
during boot where irq is expected to stay disabled.
pm_qos_update_request() uses cancel_delayed_work_sync() which
correctly assumes that irq is enabled on invocation and
unconditionally disables and re-enables it.
Gate cancel_delayed_work_sync() invocation with kevented_up() to avoid
enabling irq unexpectedly during early boot.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-tested-by: Qiao Zhou <qiaozhou@asrmicro.com>
Link: http://lkml.kernel.org/r/d2501c4c-8e7b-bea3-1b01-000b36b5dfe9@asrmicro.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power/qos.c')
| -rw-r--r-- | kernel/power/qos.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 97b0df71303e..168ff442ebde 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -482,7 +482,16 @@ void pm_qos_update_request(struct pm_qos_request *req, return; } - cancel_delayed_work_sync(&req->work); + /* + * This function may be called very early during boot, for example, + * from of_clk_init(), where irq needs to stay disabled. + * cancel_delayed_work_sync() assumes that irq is enabled on + * invocation and re-enables it on return. Avoid calling it until + * workqueue is initialized. + */ + if (keventd_up()) + cancel_delayed_work_sync(&req->work); + __pm_qos_update_request(req, new_value); } EXPORT_SYMBOL_GPL(pm_qos_update_request); |