All of lore.kernel.org
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Tony Luck <tony.luck@intel.com>,
	Borislav Petkov <bp@alien8.de>,
	Yangtao Li <tiny.windzz@gmail.com>,
	linux-acpi@vger.kernel.org
Subject: [PATCH] acpi: no need to check return value of debugfs_create functions
Date: Tue, 22 Jan 2019 16:21:03 +0100	[thread overview]
Message-ID: <20190122152151.16139-4-gregkh@linuxfoundation.org> (raw)

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Len Brown <lenb@kernel.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Yangtao Li <tiny.windzz@gmail.com>
Cc: linux-acpi@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/acpi/acpi_dbg.c      | 15 +------
 drivers/acpi/apei/einj.c     | 86 +++++++++---------------------------
 drivers/acpi/custom_method.c |  6 ---
 drivers/acpi/ec_sys.c        | 36 ++++-----------
 4 files changed, 32 insertions(+), 111 deletions(-)

diff --git a/drivers/acpi/acpi_dbg.c b/drivers/acpi/acpi_dbg.c
index a2dcd62ea32f..f3bca448b305 100644
--- a/drivers/acpi/acpi_dbg.c
+++ b/drivers/acpi/acpi_dbg.c
@@ -752,11 +752,6 @@ int __init acpi_aml_init(void)
 {
 	int ret = 0;
 
-	if (!acpi_debugfs_dir) {
-		ret = -ENOENT;
-		goto err_exit;
-	}
-
 	/* Initialize AML IO interface */
 	mutex_init(&acpi_aml_io.lock);
 	init_waitqueue_head(&acpi_aml_io.wait);
@@ -766,10 +761,6 @@ int __init acpi_aml_init(void)
 					      S_IFREG | S_IRUGO | S_IWUSR,
 					      acpi_debugfs_dir, NULL,
 					      &acpi_aml_operations);
-	if (acpi_aml_dentry == NULL) {
-		ret = -ENODEV;
-		goto err_exit;
-	}
 	ret = acpi_register_debugger(THIS_MODULE, &acpi_aml_debugger);
 	if (ret)
 		goto err_fs;
@@ -788,10 +779,8 @@ void __exit acpi_aml_exit(void)
 {
 	if (acpi_aml_initialized) {
 		acpi_unregister_debugger(&acpi_aml_debugger);
-		if (acpi_aml_dentry) {
-			debugfs_remove(acpi_aml_dentry);
-			acpi_aml_dentry = NULL;
-		}
+		debugfs_remove(acpi_aml_dentry);
+		acpi_aml_dentry = NULL;
 		acpi_aml_initialized = false;
 	}
 }
diff --git a/drivers/acpi/apei/einj.c b/drivers/acpi/apei/einj.c
index fcccbfdbdd1a..c42299e048e4 100644
--- a/drivers/acpi/apei/einj.c
+++ b/drivers/acpi/apei/einj.c
@@ -679,7 +679,6 @@ static int __init einj_init(void)
 {
 	int rc;
 	acpi_status status;
-	struct dentry *fentry;
 	struct apei_exec_context ctx;
 
 	if (acpi_disabled) {
@@ -707,25 +706,13 @@ static int __init einj_init(void)
 
 	rc = -ENOMEM;
 	einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
-	if (!einj_debug_dir) {
-		pr_err("Error creating debugfs node.\n");
-		goto err_cleanup;
-	}
 
-	fentry = debugfs_create_file("available_error_type", S_IRUSR,
-				     einj_debug_dir, NULL,
-				     &available_error_type_fops);
-	if (!fentry)
-		goto err_cleanup;
-
-	fentry = debugfs_create_file("error_type", S_IRUSR | S_IWUSR,
-				     einj_debug_dir, NULL, &error_type_fops);
-	if (!fentry)
-		goto err_cleanup;
-	fentry = debugfs_create_file("error_inject", S_IWUSR,
-				     einj_debug_dir, NULL, &error_inject_fops);
-	if (!fentry)
-		goto err_cleanup;
+	debugfs_create_file("available_error_type", S_IRUSR, einj_debug_dir,
+			    NULL, &available_error_type_fops);
+	debugfs_create_file("error_type", S_IRUSR | S_IWUSR, einj_debug_dir,
+			    NULL, &error_type_fops);
+	debugfs_create_file("error_inject", S_IWUSR, einj_debug_dir,
+			    NULL, &error_inject_fops);
 
 	apei_resources_init(&einj_resources);
 	einj_exec_ctx_init(&ctx);
@@ -750,66 +737,37 @@ static int __init einj_init(void)
 	rc = -ENOMEM;
 	einj_param = einj_get_parameter_address();
 	if ((param_extension || acpi5) && einj_param) {
-		fentry = debugfs_create_x32("flags", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &error_flags);
-		if (!fentry)
-			goto err_unmap;
-		fentry = debugfs_create_x64("param1", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &error_param1);
-		if (!fentry)
-			goto err_unmap;
-		fentry = debugfs_create_x64("param2", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &error_param2);
-		if (!fentry)
-			goto err_unmap;
-		fentry = debugfs_create_x64("param3", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &error_param3);
-		if (!fentry)
-			goto err_unmap;
-		fentry = debugfs_create_x64("param4", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &error_param4);
-		if (!fentry)
-			goto err_unmap;
-
-		fentry = debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &notrigger);
-		if (!fentry)
-			goto err_unmap;
+		debugfs_create_x32("flags", S_IRUSR | S_IWUSR, einj_debug_dir,
+				   &error_flags);
+		debugfs_create_x64("param1", S_IRUSR | S_IWUSR, einj_debug_dir,
+				   &error_param1);
+		debugfs_create_x64("param2", S_IRUSR | S_IWUSR, einj_debug_dir,
+				   &error_param2);
+		debugfs_create_x64("param3", S_IRUSR | S_IWUSR, einj_debug_dir,
+				   &error_param3);
+		debugfs_create_x64("param4", S_IRUSR | S_IWUSR, einj_debug_dir,
+				   &error_param4);
+		debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
+				   einj_debug_dir, &notrigger);
 	}
 
 	if (vendor_dev[0]) {
 		vendor_blob.data = vendor_dev;
 		vendor_blob.size = strlen(vendor_dev);
-		fentry = debugfs_create_blob("vendor", S_IRUSR,
-					     einj_debug_dir, &vendor_blob);
-		if (!fentry)
-			goto err_unmap;
-		fentry = debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
-					    einj_debug_dir, &vendor_flags);
-		if (!fentry)
-			goto err_unmap;
+		debugfs_create_blob("vendor", S_IRUSR, einj_debug_dir,
+				    &vendor_blob);
+		debugfs_create_x32("vendor_flags", S_IRUSR | S_IWUSR,
+				   einj_debug_dir, &vendor_flags);
 	}
 
 	pr_info("Error INJection is initialized.\n");
 
 	return 0;
 
-err_unmap:
-	if (einj_param) {
-		acpi_size size = (acpi5) ?
-			sizeof(struct set_error_type_with_address) :
-			sizeof(struct einj_parameter);
-
-		acpi_os_unmap_iomem(einj_param, size);
-		pr_err("Error creating param extension debugfs nodes.\n");
-	}
-	apei_exec_post_unmap_gars(&ctx);
 err_release:
 	apei_resources_release(&einj_resources);
 err_fini:
 	apei_resources_fini(&einj_resources);
-err_cleanup:
-	pr_err("Error creating primary debugfs nodes.\n");
 	debugfs_remove_recursive(einj_debug_dir);
 
 	return rc;
diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c
index 4451877f83b6..aa972dc5cb7e 100644
--- a/drivers/acpi/custom_method.c
+++ b/drivers/acpi/custom_method.c
@@ -79,14 +79,8 @@ static const struct file_operations cm_fops = {
 
 static int __init acpi_custom_method_init(void)
 {
-	if (acpi_debugfs_dir == NULL)
-		return -ENOENT;
-
 	cm_dentry = debugfs_create_file("custom_method", S_IWUSR,
 					acpi_debugfs_dir, NULL, &cm_fops);
-	if (cm_dentry == NULL)
-		return -ENODEV;
-
 	return 0;
 }
 
diff --git a/drivers/acpi/ec_sys.c b/drivers/acpi/ec_sys.c
index dd70d6c2bca0..23faa66ea772 100644
--- a/drivers/acpi/ec_sys.c
+++ b/drivers/acpi/ec_sys.c
@@ -108,52 +108,32 @@ static const struct file_operations acpi_ec_io_ops = {
 	.llseek = default_llseek,
 };
 
-static int acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
+static void acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count)
 {
 	struct dentry *dev_dir;
 	char name[64];
 	umode_t mode = 0400;
 
-	if (ec_device_count == 0) {
+	if (ec_device_count == 0)
 		acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
-		if (!acpi_ec_debugfs_dir)
-			return -ENOMEM;
-	}
 
 	sprintf(name, "ec%u", ec_device_count);
 	dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
-	if (!dev_dir) {
-		if (ec_device_count != 0)
-			goto error;
-		return -ENOMEM;
-	}
 
-	if (!debugfs_create_x32("gpe", 0444, dev_dir, &first_ec->gpe))
-		goto error;
-	if (!debugfs_create_bool("use_global_lock", 0444, dev_dir,
-				 &first_ec->global_lock))
-		goto error;
+	debugfs_create_x32("gpe", 0444, dev_dir, &first_ec->gpe);
+	debugfs_create_bool("use_global_lock", 0444, dev_dir,
+			    &first_ec->global_lock);
 
 	if (write_support)
 		mode = 0600;
-	if (!debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops))
-		goto error;
-
-	return 0;
-
-error:
-	debugfs_remove_recursive(acpi_ec_debugfs_dir);
-	return -ENOMEM;
+	debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops);
 }
 
 static int __init acpi_ec_sys_init(void)
 {
-	int err = 0;
 	if (first_ec)
-		err = acpi_ec_add_debugfs(first_ec, 0);
-	else
-		err = -ENODEV;
-	return err;
+		acpi_ec_add_debugfs(first_ec, 0);
+	return 0;
 }
 
 static void __exit acpi_ec_sys_exit(void)
-- 
2.20.1

             reply	other threads:[~2019-01-22 15:21 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-22 15:21 Greg Kroah-Hartman [this message]
2019-01-22 15:28 ` [PATCH] acpi: no need to check return value of debugfs_create functions Rafael J. Wysocki
2019-01-22 15:40   ` Greg Kroah-Hartman
2019-01-22 15:52     ` Rafael J. Wysocki

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190122152151.16139-4-gregkh@linuxfoundation.org \
    --to=gregkh@linuxfoundation.org \
    --cc=bp@alien8.de \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=rjw@rjwysocki.net \
    --cc=tiny.windzz@gmail.com \
    --cc=tony.luck@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.