wifi: wilc1000: add 'isinit' flag for SDIO bus similar to SPI

Similar to SPI priv data, add 'isinit' variable in SDIO priv. Make use
of the state to invoke hif_init() once, and acquire the lock before
accessing hif function.
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220720160302.231516-7-ajay.kathat@microchip.com

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

@@ -26,6 +26,7 @@ static const struct sdio_device_id wilc_sdio_ids[] = {
 struct wilc_sdio {
 	bool irq_gpio;
 	u32 block_size;
+	bool isinit;
 	int has_thrpt_enh3;
 };
 
@@ -193,6 +194,13 @@ static int wilc_sdio_reset(struct wilc *wilc)
 	return 0;
 }
 
+static bool wilc_sdio_is_init(struct wilc *wilc)
+{
+	struct wilc_sdio *sdio_priv = wilc->bus_data;
+
+	return sdio_priv->isinit;
+}
+
 static int wilc_sdio_suspend(struct device *dev)
 {
 	struct sdio_func *func = dev_to_sdio_func(dev);
@@ -581,6 +589,9 @@ static int wilc_sdio_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size)
 
 static int wilc_sdio_deinit(struct wilc *wilc)
 {
+	struct wilc_sdio *sdio_priv = wilc->bus_data;
+
+	sdio_priv->isinit = false;
 	return 0;
 }
 
@@ -700,6 +711,7 @@ static int wilc_sdio_init(struct wilc *wilc, bool resume)
 			 sdio_priv->has_thrpt_enh3);
 	}
 
+	sdio_priv->isinit = true;
 	return 0;
 }
 
@@ -981,6 +993,7 @@ static const struct wilc_hif_func wilc_hif_sdio = {
 	.enable_interrupt = wilc_sdio_enable_interrupt,
 	.disable_interrupt = wilc_sdio_disable_interrupt,
 	.hif_reset = wilc_sdio_reset,
+	.hif_is_init = wilc_sdio_is_init,
 };
 
 static int wilc_sdio_resume(struct device *dev)

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

@@ -1029,6 +1029,13 @@ static int wilc_spi_reset(struct wilc *wilc)
 	return result;
 }
 
+static bool wilc_spi_is_init(struct wilc *wilc)
+{
+	struct wilc_spi *spi_priv = wilc->bus_data;
+
+	return spi_priv->isinit;
+}
+
 static int wilc_spi_deinit(struct wilc *wilc)
 {
 	struct wilc_spi *spi_priv = wilc->bus_data;
@@ -1250,4 +1257,5 @@ static const struct wilc_hif_func wilc_hif_spi = {
 	.hif_block_rx_ext = wilc_spi_read,
 	.hif_sync_ext = wilc_spi_sync_ext,
 	.hif_reset = wilc_spi_reset,
+	.hif_is_init = wilc_spi_is_init,
 };

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

@@ -1481,9 +1481,12 @@ int wilc_wlan_init(struct net_device *dev)
 
 	wilc->quit = 0;
 
-	if (wilc->hif_func->hif_init(wilc, false)) {
-		ret = -EIO;
-		goto fail;
+	if (!wilc->hif_func->hif_is_init(wilc)) {
+		acquire_bus(wilc, WILC_BUS_ACQUIRE_ONLY);
+		ret = wilc->hif_func->hif_init(wilc, false);
+		release_bus(wilc, WILC_BUS_RELEASE_ONLY);
+		if (ret)
+			goto fail;
 	}
 
 	if (!wilc->tx_buffer)

drivers/net/wireless/microchip/wilc1000/wlan.h

@@ -373,6 +373,7 @@ struct wilc_hif_func {
 	int (*enable_interrupt)(struct wilc *nic);
 	void (*disable_interrupt)(struct wilc *nic);
 	int (*hif_reset)(struct wilc *wilc);
+	bool (*hif_is_init)(struct wilc *wilc);
 };
 
 #define WILC_MAX_CFG_FRAME_SIZE		1468