wifi: wilc1000: register net device only after bus being fully initialized

SDIO/SPI probes functions automatically add a default wlan interface on top
of registered wiphy, through wilc_cfg80211_init which in turn calls
wilc_netdev_ifc_init. However, bus is still not fully initialized when we
register corresponding net device (for example we still miss some private
driver data pointers), which for example makes it impossible to
retrieve MAC address from chip (which is supposed to be set on net device
before its registration) before registering net device. More generally, net
device registration should not be done until driver has fully initialized
everything and is ready to handle any operation  on the net device.

Prevent net device from being registered so early by doing it at the end of
probe functions. Apply this logic to both sdio and spi buses.
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240514-mac_addr_at_probe-v2-2-afef09f1cd10@bootlin.com

drivers/net/wireless/microchip/wilc1000/cfg80211.c

@@ -1773,7 +1773,6 @@ int wilc_cfg80211_init(struct wilc **wilc, struct device *dev, int io_type,
 		       const struct wilc_hif_func *ops)
 {
 	struct wilc *wl;
-	struct wilc_vif *vif;
 	int ret, i;
 
 	wl = wilc_create_wiphy(dev);
@@ -1802,18 +1801,9 @@ int wilc_cfg80211_init(struct wilc **wilc, struct device *dev, int io_type,
 		ret = -ENOMEM;
 		goto free_cfg;
 	}
-	vif = wilc_netdev_ifc_init(wl, "wlan%d", WILC_STATION_MODE,
-				   NL80211_IFTYPE_STATION, false);
-	if (IS_ERR(vif)) {
-		ret = PTR_ERR(vif);
-		goto free_hq;
-	}
 
 	return 0;
 
-free_hq:
-	destroy_workqueue(wl->hif_workqueue);
-
 free_cfg:
 	wilc_wlan_cfg_deinit(wl);
 

drivers/net/wireless/microchip/wilc1000/netdev.c

@@ -996,6 +996,7 @@ struct wilc_vif *wilc_netdev_ifc_init(struct wilc *wl, const char *name,
 	free_netdev(ndev);
 	return ERR_PTR(ret);
 }
+EXPORT_SYMBOL_GPL(wilc_netdev_ifc_init);
 
 MODULE_DESCRIPTION("Atmel WILC1000 core wireless driver");
 MODULE_LICENSE("GPL");

drivers/net/wireless/microchip/wilc1000/sdio.c

@@ -136,9 +136,11 @@ static int wilc_sdio_cmd53(struct wilc *wilc, struct sdio_cmd53 *cmd)
 static int wilc_sdio_probe(struct sdio_func *func,
 			   const struct sdio_device_id *id)
 {
+	struct wilc_sdio *sdio_priv;
+	struct wilc_vif *vif;
 	struct wilc *wilc;
 	int ret;
-	struct wilc_sdio *sdio_priv;
+
 
 	sdio_priv = kzalloc(sizeof(*sdio_priv), GFP_KERNEL);
 	if (!sdio_priv)
@@ -176,9 +178,17 @@ static int wilc_sdio_probe(struct sdio_func *func,
 	}
 	clk_prepare_enable(wilc->rtc_clk);
 
+	vif = wilc_netdev_ifc_init(wilc, "wlan%d", WILC_STATION_MODE,
+				   NL80211_IFTYPE_STATION, false);
+	if (IS_ERR(vif)) {
+		ret = PTR_ERR(vif);
+		goto clk_disable_unprepare;
+	}
+
 	dev_info(&func->dev, "Driver Initializing success\n");
 	return 0;
-
+clk_disable_unprepare:
+	clk_disable_unprepare(wilc->rtc_clk);
 dispose_irq:
 	irq_dispose_mapping(wilc->dev_irq_num);
 	wilc_netdev_cleanup(wilc);

drivers/net/wireless/microchip/wilc1000/spi.c

@@ -206,9 +206,10 @@ static void wilc_wlan_power(struct wilc *wilc, bool on)
 
 static int wilc_bus_probe(struct spi_device *spi)
 {
-	int ret;
-	struct wilc *wilc;
 	struct wilc_spi *spi_priv;
+	struct wilc_vif *vif;
+	struct wilc *wilc;
+	int ret;
 
 	spi_priv = kzalloc(sizeof(*spi_priv), GFP_KERNEL);
 	if (!spi_priv)
@@ -250,6 +251,12 @@ static int wilc_bus_probe(struct spi_device *spi)
 		goto power_down;
 
 	wilc_wlan_power(wilc, false);
+	vif = wilc_netdev_ifc_init(wilc, "wlan%d", WILC_STATION_MODE,
+				   NL80211_IFTYPE_STATION, false);
+	if (IS_ERR(vif)) {
+		ret = PTR_ERR(vif);
+		goto power_down;
+	}
 	return 0;
 
 power_down: