From 2addee35f2da178bf858403f2e2cb20a59df734f Mon Sep 17 00:00:00 2001
From: Wolfgang Grandegger <wg@aries-embedded.de>
Date: Mon, 14 Mar 2022 09:32:53 +0100
Subject: [PATCH] usb: dwc2: handle return code of dev_read_size() in of to,
 plat function

dev_read_size() returns -EINVAL (-22) if the property "g-tx-fifo-size"
does not exist. If that's the case, we now keep the default value of 0.

Signed-off-by: Wolfgang Grandegger <wg@aries-embedded.de>
---
 drivers/usb/gadget/dwc2_udc_otg.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
index 2748270ad6..77988f78ab 100644
--- a/drivers/usb/gadget/dwc2_udc_otg.c
+++ b/drivers/usb/gadget/dwc2_udc_otg.c
@@ -996,8 +996,9 @@ static int dwc2_udc_otg_of_to_plat(struct udevice *dev)
 	plat->rx_fifo_sz = dev_read_u32_default(dev, "g-rx-fifo-size", 0);
 	plat->np_tx_fifo_sz = dev_read_u32_default(dev, "g-np-tx-fifo-size", 0);
 
-	plat->tx_fifo_sz_nb =
-		dev_read_size(dev, "g-tx-fifo-size") / sizeof(u32);
+	ret = dev_read_size(dev, "g-tx-fifo-size");
+	if (ret > 0)
+		plat->tx_fifo_sz_nb = ret / sizeof(u32);
 	if (plat->tx_fifo_sz_nb > DWC2_MAX_HW_ENDPOINTS)
 		plat->tx_fifo_sz_nb = DWC2_MAX_HW_ENDPOINTS;
 	if (plat->tx_fifo_sz_nb) {
-- 
2.39.5