scsi: configure runtime pm before calling device_add in scsi_add_host_with_dma

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 <hkallweit1@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index ba9af4a..9ab94ad 100644 (file)
--- 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))