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authorRafael J. Wysocki <rjw@sisk.pl>2011-07-01 22:29:15 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-07-02 14:30:10 +0200
commit632e270e01d8a1ee9e8ea56c83028727f17b1d17 (patch)
tree58cbc127f9f173409f40bbaf27f8ea85c185c52d /Documentation/power
parent455716e9b12ba93e93181ac88bef62e4eb5ac66c (diff)
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')
-rw-r--r--Documentation/power/runtime_pm.txt6
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
index 513c52ef5a4..0ec3d610fc9 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