wifi: rtw89: use schedule_work to request firmware

Since we are going to load more than one firmware and some are not
presented or optional, using asynchronous API request_firmware_nowait()
will become complicated. Also, we want to use firmware_request_nowarn()
to avoid warning messages when loading optional files. So, use
schedule_work to be simpler.

To abstract loading a firmware or file, define a struct rtw89_fw_req_info
containing a struct firmware and a completion to ensure this firmware is
loaded completely.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230320130606.20777-3-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -3423,7 +3423,6 @@ void rtw89_core_stop(struct rtw89_dev *rtwdev)
 int rtw89_core_init(struct rtw89_dev *rtwdev)
 {
 	struct rtw89_btc *btc = &rtwdev->btc;
-	int ret;
 	u8 band;
 
 	INIT_LIST_HEAD(&rtwdev->ba_list);
@@ -3457,6 +3456,8 @@ int rtw89_core_init(struct rtw89_dev *rtwdev)
 
 	INIT_WORK(&rtwdev->c2h_work, rtw89_fw_c2h_work);
 	INIT_WORK(&rtwdev->ips_work, rtw89_ips_work);
+	INIT_WORK(&rtwdev->load_firmware_work, rtw89_load_firmware_work);
+
 	skb_queue_head_init(&rtwdev->c2h_queue);
 	rtw89_core_ppdu_sts_init(rtwdev);
 	rtw89_traffic_stats_init(rtwdev, &rtwdev->stats);
@@ -3468,12 +3469,10 @@ int rtw89_core_init(struct rtw89_dev *rtwdev)
 	INIT_WORK(&btc->dhcp_notify_work, rtw89_btc_ntfy_dhcp_packet_work);
 	INIT_WORK(&btc->icmp_notify_work, rtw89_btc_ntfy_icmp_packet_work);
 
-	ret = rtw89_load_firmware(rtwdev);
-	if (ret) {
-		rtw89_warn(rtwdev, "no firmware loaded\n");
-		destroy_workqueue(rtwdev->txq_wq);
-		return ret;
-	}
+	init_completion(&rtwdev->fw.req.completion);
+
+	schedule_work(&rtwdev->load_firmware_work);
+
 	rtw89_ser_init(rtwdev);
 	rtw89_entity_init(rtwdev);
 
@@ -3792,7 +3791,7 @@ struct rtw89_dev *rtw89_alloc_ieee80211_hw(struct device *device,
 	rtwdev->dev = device;
 	rtwdev->ops = ops;
 	rtwdev->chip = chip;
-	rtwdev->fw.firmware = firmware;
+	rtwdev->fw.req.firmware = firmware;
 
 	rtw89_debug(rtwdev, RTW89_DBG_FW, "probe driver %s chanctx\n",
 		    no_chanctx ? "without" : "with");
@@ -3809,7 +3808,7 @@ EXPORT_SYMBOL(rtw89_alloc_ieee80211_hw);
 void rtw89_free_ieee80211_hw(struct rtw89_dev *rtwdev)
 {
 	kfree(rtwdev->ops);
-	release_firmware(rtwdev->fw.firmware);
+	release_firmware(rtwdev->fw.req.firmware);
 	ieee80211_free_hw(rtwdev->hw);
 }
 EXPORT_SYMBOL(rtw89_free_ieee80211_hw);

drivers/net/wireless/realtek/rtw89/core.h

@@ -3297,10 +3297,13 @@ struct rtw89_fw_suit {
 			  GET_FW_HDR_SUBVERSION(fw_hdr),	\
 			  GET_FW_HDR_SUBINDEX(fw_hdr))
 
-struct rtw89_fw_info {
+struct rtw89_fw_req_info {
 	const struct firmware *firmware;
-	struct rtw89_dev *rtwdev;
 	struct completion completion;
+};
+
+struct rtw89_fw_info {
+	struct rtw89_fw_req_info req;
 	u8 h2c_seq;
 	u8 rec_seq;
 	u8 h2c_counter;
@@ -4018,6 +4021,7 @@ struct rtw89_dev {
 	struct sk_buff_head c2h_queue;
 	struct work_struct c2h_work;
 	struct work_struct ips_work;
+	struct work_struct load_firmware_work;
 
 	struct list_head early_h2c_list;
 

drivers/net/wireless/realtek/rtw89/fw.c

@@ -155,8 +155,9 @@ int rtw89_mfw_recognize(struct rtw89_dev *rtwdev, enum rtw89_fw_type type,
 			struct rtw89_fw_suit *fw_suit, bool nowarn)
 {
 	struct rtw89_fw_info *fw_info = &rtwdev->fw;
-	const u8 *mfw = fw_info->firmware->data;
-	u32 mfw_len = fw_info->firmware->size;
+	const struct firmware *firmware = fw_info->req.firmware;
+	const u8 *mfw = firmware->data;
+	u32 mfw_len = firmware->size;
 	const struct rtw89_mfw_hdr *mfw_hdr = (const struct rtw89_mfw_hdr *)mfw;
 	const struct rtw89_mfw_info *mfw_info;
 	int i;
@@ -631,67 +632,58 @@ int rtw89_wait_firmware_completion(struct rtw89_dev *rtwdev)
 {
 	struct rtw89_fw_info *fw = &rtwdev->fw;
 
-	wait_for_completion(&fw->completion);
-	if (!fw->firmware)
+	wait_for_completion(&fw->req.completion);
+	if (!fw->req.firmware)
 		return -EINVAL;
 
 	return 0;
 }
 
-static void rtw89_load_firmware_cb(const struct firmware *firmware, void *context)
+static int rtw89_load_firmware_req(struct rtw89_dev *rtwdev,
+				   struct rtw89_fw_req_info *req,
+				   const char *fw_name, bool nowarn)
 {
-	struct rtw89_fw_info *fw = context;
-	struct rtw89_dev *rtwdev = fw->rtwdev;
-
-	if (!firmware || !firmware->data) {
-		rtw89_err(rtwdev, "failed to request firmware\n");
-		complete_all(&fw->completion);
-		return;
-	}
-
-	fw->firmware = firmware;
-	complete_all(&fw->completion);
-}
-
-int rtw89_load_firmware(struct rtw89_dev *rtwdev)
-{
-	struct rtw89_fw_info *fw = &rtwdev->fw;
-	const char *fw_name = rtwdev->chip->fw_name;
 	int ret;
 
-	fw->rtwdev = rtwdev;
-	init_completion(&fw->completion);
-
-	if (fw->firmware) {
+	if (req->firmware) {
 		rtw89_debug(rtwdev, RTW89_DBG_FW,
 			    "full firmware has been early requested\n");
-		complete_all(&fw->completion);
+		complete_all(&req->completion);
 		return 0;
 	}
 
-	ret = request_firmware_nowait(THIS_MODULE, true, fw_name, rtwdev->dev,
-				      GFP_KERNEL, fw, rtw89_load_firmware_cb);
-	if (ret) {
-		rtw89_err(rtwdev, "failed to async firmware request\n");
-		return ret;
-	}
+	if (nowarn)
+		ret = firmware_request_nowarn(&req->firmware, fw_name, rtwdev->dev);
+	else
+		ret = request_firmware(&req->firmware, fw_name, rtwdev->dev);
 
-	return 0;
+	complete_all(&req->completion);
+
+	return ret;
+}
+
+void rtw89_load_firmware_work(struct work_struct *work)
+{
+	struct rtw89_dev *rtwdev =
+		container_of(work, struct rtw89_dev, load_firmware_work);
+	const char *fw_name = rtwdev->chip->fw_name;
+
+	rtw89_load_firmware_req(rtwdev, &rtwdev->fw.req, fw_name, false);
 }
 
 void rtw89_unload_firmware(struct rtw89_dev *rtwdev)
 {
 	struct rtw89_fw_info *fw = &rtwdev->fw;
 
-	rtw89_wait_firmware_completion(rtwdev);
+	cancel_work_sync(&rtwdev->load_firmware_work);
 
-	if (fw->firmware) {
-		release_firmware(fw->firmware);
+	if (fw->req.firmware) {
+		release_firmware(fw->req.firmware);
 
 		/* assign NULL back in case rtw89_free_ieee80211_hw()
 		 * try to release the same one again.
 		 */
-		fw->firmware = NULL;
+		fw->req.firmware = NULL;
 	}
 }
 

drivers/net/wireless/realtek/rtw89/fw.h

@@ -3660,7 +3660,7 @@ rtw89_early_fw_feature_recognize(struct device *device,
 				 const struct rtw89_chip_info *chip,
 				 struct rtw89_fw_info *early_fw);
 int rtw89_fw_download(struct rtw89_dev *rtwdev, enum rtw89_fw_type type);
-int rtw89_load_firmware(struct rtw89_dev *rtwdev);
+void rtw89_load_firmware_work(struct work_struct *work);
 void rtw89_unload_firmware(struct rtw89_dev *rtwdev);
 int rtw89_wait_firmware_completion(struct rtw89_dev *rtwdev);
 void rtw89_h2c_pkt_set_hdr(struct rtw89_dev *rtwdev, struct sk_buff *skb,