修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/sound/firewire/fireworks/fireworks.c
..
..
@@ -1,10 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * fireworks.c - a part of driver for Fireworks based devices
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  *
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  * Copyright (c) 2009-2010 Clemens Ladisch
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  * Copyright (c) 2013-2014 Takashi Sakamoto
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- *
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- * Licensed under the terms of the GNU General Public License, version 2.
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  */
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8
 
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 /*
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@@ -184,36 +183,17 @@
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 	return err;
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 }
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185
 
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-static void efw_free(struct snd_efw *efw)
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-{
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-	snd_efw_stream_destroy_duplex(efw);
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-	snd_efw_transaction_remove_instance(efw);
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-	fw_unit_put(efw->unit);
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-
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-	kfree(efw->resp_buf);
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-
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-	mutex_destroy(&efw->mutex);
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-	kfree(efw);
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-}
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-
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-/*
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- * This module releases the FireWire unit data after all ALSA character devices
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- * are released by applications. This is for releasing stream data or finishing
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- * transactions safely. Thus at returning from .remove(), this module still keep
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- * references for the unit.
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- */
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 static void
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 efw_card_free(struct snd_card *card)
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 {
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 	struct snd_efw *efw = card->private_data;
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-	if (efw->card_index >= 0) {
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-		mutex_lock(&devices_mutex);
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-		clear_bit(efw->card_index, devices_used);
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-		mutex_unlock(&devices_mutex);
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-	}
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+	mutex_lock(&devices_mutex);
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+	clear_bit(efw->card_index, devices_used);
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+	mutex_unlock(&devices_mutex);
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-	efw_free(card->private_data);
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+	snd_efw_stream_destroy_duplex(efw);
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+	snd_efw_transaction_remove_instance(efw);
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 }
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 static void
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@@ -226,9 +206,8 @@
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 	if (efw->registered)
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 		return;
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-	mutex_lock(&devices_mutex);
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-
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 	/* check registered cards */
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+	mutex_lock(&devices_mutex);
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 	for (card_index = 0; card_index < SNDRV_CARDS; ++card_index) {
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 		if (!test_bit(card_index, devices_used) && enable[card_index])
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 			break;
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@@ -244,12 +223,18 @@
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 		mutex_unlock(&devices_mutex);
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 		return;
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 	}
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+	set_bit(card_index, devices_used);
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+	mutex_unlock(&devices_mutex);
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+
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+	efw->card->private_free = efw_card_free;
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+	efw->card->private_data = efw;
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 	/* prepare response buffer */
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 	snd_efw_resp_buf_size = clamp(snd_efw_resp_buf_size,
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 				      SND_EFW_RESPONSE_MAXIMUM_BYTES, 4096U);
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-	efw->resp_buf = kzalloc(snd_efw_resp_buf_size, GFP_KERNEL);
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-	if (efw->resp_buf == NULL) {
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+	efw->resp_buf = devm_kzalloc(&efw->card->card_dev,
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+				     snd_efw_resp_buf_size, GFP_KERNEL);
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+	if (!efw->resp_buf) {
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 		err = -ENOMEM;
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 		goto error;
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 	}
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@@ -284,25 +269,11 @@
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 	if (err < 0)
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 		goto error;
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-	set_bit(card_index, devices_used);
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-	mutex_unlock(&devices_mutex);
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-
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-	/*
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-	 * After registered, efw instance can be released corresponding to
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-	 * releasing the sound card instance.
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-	 */
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-	efw->card->private_free = efw_card_free;
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-	efw->card->private_data = efw;
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 	efw->registered = true;
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 	return;
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 error:
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-	mutex_unlock(&devices_mutex);
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-	snd_efw_transaction_remove_instance(efw);
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-	snd_efw_stream_destroy_duplex(efw);
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 	snd_card_free(efw->card);
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-	kfree(efw->resp_buf);
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-	efw->resp_buf = NULL;
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 	dev_info(&efw->unit->device,
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 		 "Sound card registration failed: %d\n", err);
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 }
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@@ -312,10 +283,9 @@
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 {
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 	struct snd_efw *efw;
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285
 
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-	efw = kzalloc(sizeof(struct snd_efw), GFP_KERNEL);
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+	efw = devm_kzalloc(&unit->device, sizeof(struct snd_efw), GFP_KERNEL);
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 	if (efw == NULL)
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 		return -ENOMEM;
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-
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 	efw->unit = fw_unit_get(unit);
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 	dev_set_drvdata(&unit->device, efw);
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@@ -363,12 +333,12 @@
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 	cancel_delayed_work_sync(&efw->dwork);
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 	if (efw->registered) {
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-		/* No need to wait for releasing card object in this context. */
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-		snd_card_free_when_closed(efw->card);
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-	} else {
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-		/* Don't forget this case. */
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-		efw_free(efw);
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+		// Block till all of ALSA character devices are released.
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+		snd_card_free(efw->card);
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 	}
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+
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+	mutex_destroy(&efw->mutex);
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+	fw_unit_put(efw->unit);
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 }
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 static const struct ieee1394_device_id efw_id_table[] = {
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@@ -392,7 +362,7 @@
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 static struct fw_driver efw_driver = {
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 	.driver = {
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 		.owner = THIS_MODULE,
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-		.name = "snd-fireworks",
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+		.name = KBUILD_MODNAME,
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 		.bus = &fw_bus_type,
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 	},
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 	.probe    = efw_probe,