add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/mmc/core/debugfs.c
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@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Debugfs support for hosts and cards
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  *
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  * Copyright (C) 2008 Atmel Corporation
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/moduleparam.h>
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 #include <linux/export.h>
..
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@@ -222,32 +219,7 @@
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 	return 0;
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 }
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-DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
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-	"%llu\n");
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-
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-static int mmc_max_clock_opt_get(void *data, u64 *val)
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-{
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-	struct mmc_host *host = data;
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-
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-	*val = host->f_max;
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-
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-	return 0;
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-}
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-
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-static int mmc_max_clock_opt_set(void *data, u64 val)
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-{
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-	struct mmc_host *host = data;
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-
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-	/* We need this check due to input value is u64 */
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-	if (val != 0 && (val > UHS_SDR104_MAX_DTR || val < host->f_min))
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-		return -EINVAL;
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-
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-	host->f_max = (unsigned int) val;
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-
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-	return 0;
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-}
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-
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-DEFINE_DEBUGFS_ATTRIBUTE(mmc_max_clock_fops, mmc_max_clock_opt_get, mmc_max_clock_opt_set,
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+DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
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 	"%llu\n");
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 void mmc_add_host_debugfs(struct mmc_host *host)
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@@ -255,48 +227,21 @@
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 	struct dentry *root;
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228
 
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 	root = debugfs_create_dir(mmc_hostname(host), NULL);
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-	if (IS_ERR(root))
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-		/* Don't complain -- debugfs just isn't enabled */
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-		return;
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-	if (!root)
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-		/* Complain -- debugfs is enabled, but it failed to
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-		 * create the directory. */
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-		goto err_root;
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-
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 	host->debugfs_root = root;
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-	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
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-		goto err_node;
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-
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-	if (!debugfs_create_x32("caps", S_IRUSR, root, &host->caps))
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-		goto err_node;
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-
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-	if (!debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2))
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-		goto err_node;
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-
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-	if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
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-			&mmc_clock_fops))
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-		goto err_node;
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-
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-	debugfs_create_file_unsafe("max_clock", S_IRUSR | S_IWUSR, root, host,
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-				   &mmc_max_clock_fops);
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+	debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops);
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+	debugfs_create_x32("caps", S_IRUSR, root, &host->caps);
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+	debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2);
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+	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
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+				   &mmc_clock_fops);
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 #ifdef CONFIG_FAIL_MMC_REQUEST
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 	if (fail_request)
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 		setup_fault_attr(&fail_default_attr, fail_request);
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 	host->fail_mmc_request = fail_default_attr;
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-	if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
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-					     root,
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-					     &host->fail_mmc_request)))
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-		goto err_node;
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+	fault_create_debugfs_attr("fail_mmc_request", root,
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+				  &host->fail_mmc_request);
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 #endif
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-	return;
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-
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-err_node:
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-	debugfs_remove_recursive(root);
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-	host->debugfs_root = NULL;
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-err_root:
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-	dev_err(&host->class_dev, "failed to initialize debugfs\n");
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 }
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 void mmc_remove_host_debugfs(struct mmc_host *host)
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@@ -313,25 +258,9 @@
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 		return;
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 	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
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-	if (IS_ERR(root))
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-		/* Don't complain -- debugfs just isn't enabled */
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-		return;
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-	if (!root)
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-		/* Complain -- debugfs is enabled, but it failed to
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-		 * create the directory. */
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-		goto err;
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-
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 	card->debugfs_root = root;
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-	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
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-		goto err;
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-
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-	return;
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-
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-err:
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-	debugfs_remove_recursive(root);
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-	card->debugfs_root = NULL;
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-	dev_err(&card->dev, "failed to initialize debugfs\n");
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+	debugfs_create_x32("state", S_IRUSR, root, &card->state);
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 }
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 void mmc_remove_card_debugfs(struct mmc_card *card)