linux-kernel - [PATCH] wifi: rt2x00: check retval for of_get_mac

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Message-ID: <20251014050833.46377-1-rosenp@gmail.com>
Date: Mon, 13 Oct 2025 22:08:33 -0700
From: Rosen Penev <rosenp@...il.com>
To: linux-wireless@...r.kernel.org
Cc: Stanislaw Gruszka <stf_xl@...pl>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] wifi: rt2x00: check retval for of_get_mac_address

of_get_mac_address can return -EPROBE_DEFER when nvmem is not probed yet
for whatever reason. In this case, nvmem mac assignments will not work.

Based on the function path, this change only has effect for rt2800soc.c
and rt2800pci.c. The former tends to use nvmem for assignments.

Signed-off-by: Rosen Penev <rosenp@...il.com>
---
 drivers/net/wireless/ralink/rt2x00/rt2800lib.c |  4 +++-
 drivers/net/wireless/ralink/rt2x00/rt2x00.h    |  2 +-
 drivers/net/wireless/ralink/rt2x00/rt2x00dev.c | 10 ++++++++--
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
index b312b40f4aa3..af19153697ed 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c
@@ -11010,7 +11010,9 @@ static int rt2800_validate_eeprom(struct rt2x00_dev *rt2x00dev)
 	 * Start validation of the data that has been read.
 	 */
 	mac = rt2800_eeprom_addr(rt2x00dev, EEPROM_MAC_ADDR_0);
-	rt2x00lib_set_mac_address(rt2x00dev, mac);
+	retval = rt2x00lib_set_mac_address(rt2x00dev, mac);
+	if (retval)
+		return retval;
 
 	word = rt2800_eeprom_read(rt2x00dev, EEPROM_NIC_CONF0);
 	if (word == 0xffff) {
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00.h b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
index 0b67b09695b6..4d6437deaa9a 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00.h
@@ -1416,7 +1416,7 @@ static inline void rt2x00debug_dump_frame(struct rt2x00_dev *rt2x00dev,
  */
 u32 rt2x00lib_get_bssidx(struct rt2x00_dev *rt2x00dev,
 			 struct ieee80211_vif *vif);
-void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr);
+int rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr);
 
 /*
  * Interrupt context handlers.
diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
index ee667e1a7937..4af132acadb6 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
@@ -984,14 +984,20 @@ static void rt2x00lib_rate(struct ieee80211_rate *entry,
 		entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
 }
 
-void rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
+int rt2x00lib_set_mac_address(struct rt2x00_dev *rt2x00dev, u8 *eeprom_mac_addr)
 {
-	of_get_mac_address(rt2x00dev->dev->of_node, eeprom_mac_addr);
+	int ret;
+
+	ret = of_get_mac_address(rt2x00dev->dev->of_node, eeprom_mac_addr);
+	if (ret == -EPROBE_DEFER)
+		return ret;
 
 	if (!is_valid_ether_addr(eeprom_mac_addr)) {
 		eth_random_addr(eeprom_mac_addr);
 		rt2x00_eeprom_dbg(rt2x00dev, "MAC: %pM\n", eeprom_mac_addr);
 	}
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00lib_set_mac_address);
 
-- 
2.51.0