+ /*
+ * Adaptive polling frequency based on the assumption
+ * that an interrupt will be closely followed by more.
+ * This has a substantial benefit for network devices.
+ */
+ if (!(host->caps & MMC_CAP_SDIO_IRQ)) {
+ if (ret > 0)
+ period /= 2;
+ else {
+ period++;
+ if (period > idle_period)
+ period = idle_period;
+ }
+ }
+
+ set_current_state(TASK_INTERRUPTIBLE);