staging: wfx: preserve endianness of struct hif_ind_startup

The hardware fills struct hif_ind_startup with little endian values. So,
declare it with little endian fields.

It is now a bit more verbose to access to fields of struct
hif_ind_startup, but it is less confusing.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20220113085524.1110708-12-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/bh.c

@@ -182,9 +182,9 @@ static void tx_helper(struct wfx_dev *wdev, struct hif_msg *hif)
 	wdev->hif.tx_seqnum = (wdev->hif.tx_seqnum + 1) % (HIF_COUNTER_MAX + 1);
 
 	data = hif;
-	WARN(len > wdev->hw_caps.size_inp_ch_buf,
-	     "%s: request exceed the chip capability: %zu > %d\n", __func__,
-	     len, wdev->hw_caps.size_inp_ch_buf);
+	WARN(len > le16_to_cpu(wdev->hw_caps.size_inp_ch_buf),
+	     "request exceed the chip capability: %zu > %d\n",
+	     len, le16_to_cpu(wdev->hw_caps.size_inp_ch_buf));
 	len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, len);
 	ret = wfx_data_write(wdev, data, len);
 	if (ret)
@@ -204,7 +204,7 @@ static int bh_work_tx(struct wfx_dev *wdev, int max_msg)
 
 	for (i = 0; i < max_msg; i++) {
 		hif = NULL;
-		if (wdev->hif.tx_buffers_used < wdev->hw_caps.num_inp_ch_bufs) {
+		if (wdev->hif.tx_buffers_used < le16_to_cpu(wdev->hw_caps.num_inp_ch_bufs)) {
 			if (try_wait_for_completion(&wdev->hif_cmd.ready)) {
 				WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error");
 				hif = wdev->hif_cmd.buf_send;

drivers/staging/wfx/data_tx.c

@@ -359,10 +359,10 @@ static int wfx_tx_inner(struct wfx_vif *wvif, struct ieee80211_sta *sta,
 	hif_msg->len = cpu_to_le16(skb->len);
 	hif_msg->id = HIF_REQ_ID_TX;
 	hif_msg->interface = wvif->id;
-	if (skb->len > wvif->wdev->hw_caps.size_inp_ch_buf) {
+	if (skb->len > le16_to_cpu(wvif->wdev->hw_caps.size_inp_ch_buf)) {
 		dev_warn(wvif->wdev->dev,
 			 "requested frame size (%d) is larger than maximum supported (%d)\n",
-			 skb->len, wvif->wdev->hw_caps.size_inp_ch_buf);
+			 skb->len, le16_to_cpu(wvif->wdev->hw_caps.size_inp_ch_buf));
 		skb_pull(skb, wmsg_len);
 		return -EIO;
 	}

drivers/staging/wfx/hif_api_general.h

@@ -108,16 +108,12 @@ enum hif_api_rate_index {
 };
 
 struct hif_ind_startup {
-	/* As the others, this struct is interpreted as little endian by the
-	 * device. However, this struct is also used by the driver. We prefer to
-	 * declare it in native order and doing byte swap on reception.
-	 */
 	__le32 status;
-	u16    hardware_id;
+	__le16 hardware_id;
 	u8     opn[14];
 	u8     uid[8];
-	u16    num_inp_ch_bufs;
-	u16    size_inp_ch_buf;
+	__le16 num_inp_ch_bufs;
+	__le16 size_inp_ch_buf;
 	u8     num_links_ap;
 	u8     num_interfaces;
 	u8     mac_addr[2][ETH_ALEN];
@@ -138,7 +134,7 @@ struct hif_ind_startup {
 	u8     phy1_region:3;
 	u8     phy0_region:3;
 	u8     otp_phy_ver:2;
-	u32    supported_rate_mask;
+	__le32 supported_rate_mask;
 	u8     firmware_label[128];
 } __packed;
 

drivers/staging/wfx/hif_rx.c

@@ -81,11 +81,6 @@ static int hif_startup_indication(struct wfx_dev *wdev,
 		return -EINVAL;
 	}
 	memcpy(&wdev->hw_caps, body, sizeof(struct hif_ind_startup));
-	le16_to_cpus((__le16 *)&wdev->hw_caps.hardware_id);
-	le16_to_cpus((__le16 *)&wdev->hw_caps.num_inp_ch_bufs);
-	le16_to_cpus((__le16 *)&wdev->hw_caps.size_inp_ch_buf);
-	le32_to_cpus((__le32 *)&wdev->hw_caps.supported_rate_mask);
-
 	complete(&wdev->firmware_ready);
 	return 0;
 }