--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -3534,7 +3534,8 @@ int ath10k_core_register(struct ath10k *
 	 * Forcing the work to be done immediately works around this problem
 	 * but may also delay the boot when firmware images cannot be found.
 	 */
-	flush_workqueue(ar->workqueue);
+	if (ar->hif.bus != ATH10K_BUS_SDIO)
+		flush_workqueue(ar->workqueue);
 
 	return 0;
 }
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -1261,6 +1261,9 @@ static int ath10k_debug_cal_data_fetch(s
 	if (ar->hw_params.cal_data_len == 0)
 		return -EOPNOTSUPP;
 
+	if (ar->hif.bus == ATH10K_BUS_SDIO)
+		return -EINVAL;
+
 	hi_addr = host_interest_item_address(HI_ITEM(hi_board_data));
 
 	ret = ath10k_hif_diag_read(ar, hi_addr, &addr, sizeof(addr));