Re: [PATCH] wlcore: sdio: Fix flakey SDIO runtime PM handling

We can have pm_runtime_get_sync() return 1, and we can have
pm_runtime_put_sync() return -EBUSY. See rpm_suspend() and
rpm_resume() for more information.

Fix the issue by returning 0 from wl12xx_sdio_power_on() on success.
And use pm_runtime_put() instead of pm_runtime_put_sync() for
wl12xx_sdio_power_off(), then the MMC subsystem will idle the bus
when suitable.

Otherwise wlcore can sometimes get confused and may report bogus
errors and WLAN connection can fail.

@@ -180,7 +180,7 @@ static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
 	sdio_release_host(func);
 
 	/* Let runtime PM know the card is powered off */
-	return pm_runtime_put_sync(&card->dev);
+	return pm_runtime_put(&card->dev);
 }