FROMLIST v2: media: qcom: camss: Fix ordering of pm_runtime_enable

pm_runtime_enable() should happen prior to vfe_get() since vfe_get() calls
pm_runtime_resume_and_get().

This is a basic race condition that doesn't show up for most users so is
not widely reported. If you blacklist qcom-camss in modules.d and then
subsequently modprobe the module post-boot it is possible to reliably show
this error up.

The kernel log for this error looks like this:

qcom-camss ac5a000.camss: Failed to power up pipeline: -13

Fixes: 02afa81 ("media: camss: Add basic runtime PM support")
Reported-by: Johan Hovold <[email protected]>
Closes: https://lore.kernel.org/lkml/[email protected]/
Tested-by: Johan Hovold <[email protected]>
Cc: <[email protected]>
Signed-off-by: Bryan O'Donoghue <[email protected]>

drivers/media/platform/qcom/camss/camss.c

@@ -1823,6 +1823,8 @@ static int camss_probe(struct platform_device *pdev)
 
 	v4l2_async_nf_init(&camss->notifier, &camss->v4l2_dev);
 
+	pm_runtime_enable(dev);
+
 	num_subdevs = camss_of_parse_ports(camss);
 	if (num_subdevs < 0) {
 		ret = num_subdevs;
@@ -1859,15 +1861,14 @@ static int camss_probe(struct platform_device *pdev)
 		}
 	}
 
-	pm_runtime_enable(dev);
-
 	return 0;
 
 err_register_subdevs:
 	camss_unregister_entities(camss);
 err_v4l2_device_unregister:
 	v4l2_device_unregister(&camss->v4l2_dev);
 	v4l2_async_nf_cleanup(&camss->notifier);
+	pm_runtime_disable(dev);
 err_genpd_cleanup:
 	camss_genpd_cleanup(camss);