acpi: no need to check return value of debugfs_create functions

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" <[email protected]>

Cc Len Brown <[email protected]>

Cc Tony Luck <[email protected]>

Cc Borislav Petkov <[email protected]>

Cc Yangtao Li <[email protected]>

Cc [email protected]

Signed-off-by Greg Kroah-Hartman <[email protected]>

---
 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(-)

drivers/acpi/acpi_dbg.c +2 -13

index a2dcd62ea32f..f3bca448b305 100644
@@ -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;
        }
 }

drivers/acpi/apei/einj.c +22 -64

index fcccbfdbdd1a..c42299e048e4 100644
@@ -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;

drivers/acpi/custom_method.c +0 -6

index 4451877f83b6..aa972dc5cb7e 100644
@@ -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;
 }
 

drivers/acpi/ec_sys.c +8 -29

index dd70d6c2bca0..23faa66ea772 100644
@@ -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

Quoted 5 lines · Greg Kroah-Hartman

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.

Quoted 7 lines

Cc "Rafael J. Wysocki" <[email protected]>

Cc Len Brown <[email protected]>

Cc Tony Luck <[email protected]>

Cc Borislav Petkov <[email protected]>

Cc Yangtao Li <[email protected]>

Cc [email protected]

Signed-off-by Greg Kroah-Hartman <[email protected]>

Acked-by Rafael J. Wysocki <[email protected]>

Or do you want me to take this?

Quoted 15 lines · Rafael J. Wysocki

Quoted 12 lines · Greg Kroah-Hartman

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" <[email protected]>

Cc Len Brown <[email protected]>

Cc Tony Luck <[email protected]>

Cc Borislav Petkov <[email protected]>

Cc Yangtao Li <[email protected]>

Cc [email protected]

Signed-off-by Greg Kroah-Hartman <[email protected]>

Quoted 3 lines

Acked-by Rafael J. Wysocki <[email protected]>

Or do you want me to take this?

It's up to you, I can take it, or you can, either is fine with me :)