diff options
| 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 /drivers/scsi/scsi_pm.c | |
| 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 'drivers/scsi/scsi_pm.c')
| -rw-r--r-- | drivers/scsi/scsi_pm.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index d70e91ae60af..d82a023a9015 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -144,9 +144,9 @@ int scsi_autopm_get_device(struct scsi_device *sdev) int err; err = pm_runtime_get_sync(&sdev->sdev_gendev); - if (err < 0) + if (err < 0 && err !=-EACCES) pm_runtime_put_sync(&sdev->sdev_gendev); - else if (err > 0) + else err = 0; return err; } @@ -173,9 +173,9 @@ int scsi_autopm_get_host(struct Scsi_Host *shost) int err; err = pm_runtime_get_sync(&shost->shost_gendev); - if (err < 0) + if (err < 0 && err !=-EACCES) pm_runtime_put_sync(&shost->shost_gendev); - else if (err > 0) + else err = 0; return err; } |