Am 03.08.2016 um 21:49 schrieb Heiner Kallweit: > Runtime PM should be configured already once we call device_add. See also > the description in this mail thread > https://lists.linuxfoundation.org/pipermail/linux-pm/2009-November/023198.html > or the order of calls e.g. in usb_new_device. > > The changed order also helps to avoid scenarios where runtime pm for > &shost->shost_gendev is activated whilst the parent is suspended, > resulting in error message "runtime PM trying to activate child device > hostx but parent yyy is not active". > > In addition properly reverse the runtime pm calls in the error path. > > Signed-off-by: Heiner Kallweit <[email protected]> > --- > drivers/scsi/hosts.c | 12 ++++++++---- > 1 file changed, 8 insertions(+), 4 deletions(-) > > diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c > index ba9af4a..9ab94ad 100644 > --- a/drivers/scsi/hosts.c > +++ b/drivers/scsi/hosts.c > @@ -246,10 +246,6 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, > struct device *dev, > > shost->dma_dev = dma_dev; > > - error = device_add(&shost->shost_gendev); > - if (error) > - goto out_destroy_freelist; > - > /* > * Increase usage count temporarily here so that calling > * scsi_autopm_put_host() will trigger runtime idle if there is > @@ -260,6 +256,10 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, > struct device *dev, > pm_runtime_enable(&shost->shost_gendev); > device_enable_async_suspend(&shost->shost_gendev); > > + error = device_add(&shost->shost_gendev); > + if (error) > + goto out_destroy_freelist; > + > scsi_host_set_state(shost, SHOST_RUNNING); > get_device(shost->shost_gendev.parent); > > @@ -309,6 +309,10 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, > struct device *dev, > out_del_gendev: > device_del(&shost->shost_gendev); > out_destroy_freelist: > + device_disable_async_suspend(&shost->shost_gendev); > + pm_runtime_disable(&shost->shost_gendev); > + pm_runtime_set_suspended(&shost->shost_gendev); > + pm_runtime_put_noidle(&shost->shost_gendev); > scsi_destroy_command_freelist(shost); > out_destroy_tags: > if (shost_use_blk_mq(shost)) > Acked-by: Alan Stern <[email protected]>
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