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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-07-01 22:29:15 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-07-02 14:30:10 +0200 |
| commit | 632e270e01d8a1ee9e8ea56c83028727f17b1d17 (patch) | |
| tree | 58cbc127f9f173409f40bbaf27f8ea85c185c52d /Documentation/power/runtime_pm.txt | |
| parent | PM / Runtime: Update documentation of interactions with system sleep (diff) | |
| download | linux-632e270e01d8a1ee9e8ea56c83028727f17b1d17.tar.xz linux-632e270e01d8a1ee9e8ea56c83028727f17b1d17.zip | |
PM / Runtime: Return special error code if runtime PM is disabled
Some callers of pm_runtime_get_sync() and other runtime PM helper
functions, scsi_autopm_get_host() and scsi_autopm_get_device() in
particular, need to distinguish error codes returned when runtime PM
is disabled (i.e. power.disable_depth is nonzero for the given
device) from error codes returned in other situations. For this
reason, make the runtime PM helper functions return -EACCES when
power.disable_depth is nonzero and ensure that this error code
won't be returned by them in any other circumstances. Modify
scsi_autopm_get_host() and scsi_autopm_get_device() to check the
error code returned by pm_runtime_get_sync() and ignore -EACCES.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'Documentation/power/runtime_pm.txt')
| -rw-r--r-- | Documentation/power/runtime_pm.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt index 513c52ef5a42..0ec3d610fc9a 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.txt @@ -291,7 +291,8 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: - execute the subsystem-level suspend callback for the device; returns 0 on success, 1 if the device's run-time PM status was already 'suspended', or error code on failure, where -EAGAIN or -EBUSY means it is safe to attempt - to suspend the device again in future + to suspend the device again in future and -EACCES means that + 'power.disable_depth' is different from 0 int pm_runtime_autosuspend(struct device *dev); - same as pm_runtime_suspend() except that the autosuspend delay is taken @@ -304,7 +305,8 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: success, 1 if the device's run-time PM status was already 'active' or error code on failure, where -EAGAIN means it may be safe to attempt to resume the device again in future, but 'power.runtime_error' should be - checked additionally + checked additionally, and -EACCES means that 'power.disable_depth' is + different from 0 int pm_request_idle(struct device *dev); - submit a request to execute the subsystem-level idle callback for the |