linux-kernel - [PATCH 4/7] crypto: cavium: zip: no need to check return value of debugfs

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Date:   Tue, 22 Jan 2019 16:14:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        David Miller <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Robert Richter <rrichter@...ium.com>,
        Jan Glauber <jglauber@...ium.com>
Subject: [PATCH 4/7] crypto: cavium: zip: 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: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Robert Richter <rrichter@...ium.com>
Cc: Jan Glauber <jglauber@...ium.com>
Cc: linux-crypto@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/crypto/cavium/zip/zip_main.c | 52 ++++++----------------------
 1 file changed, 11 insertions(+), 41 deletions(-)

diff --git a/drivers/crypto/cavium/zip/zip_main.c b/drivers/crypto/cavium/zip/zip_main.c
index be055b9547f6..e6b09e784e66 100644
--- a/drivers/crypto/cavium/zip/zip_main.c
+++ b/drivers/crypto/cavium/zip/zip_main.c
@@ -618,41 +618,23 @@ static const struct file_operations zip_regs_fops = {
 /* Root directory for thunderx_zip debugfs entry */
 static struct dentry *zip_debugfs_root;
 
-static int __init zip_debugfs_init(void)
+static void __init zip_debugfs_init(void)
 {
-	struct dentry *zip_stats, *zip_clear, *zip_regs;
-
 	if (!debugfs_initialized())
-		return -ENODEV;
+		return;
 
 	zip_debugfs_root = debugfs_create_dir("thunderx_zip", NULL);
-	if (!zip_debugfs_root)
-		return -ENOMEM;
 
 	/* Creating files for entries inside thunderx_zip directory */
-	zip_stats = debugfs_create_file("zip_stats", 0444,
-					zip_debugfs_root,
-					NULL, &zip_stats_fops);
-	if (!zip_stats)
-		goto failed_to_create;
-
-	zip_clear = debugfs_create_file("zip_clear", 0444,
-					zip_debugfs_root,
-					NULL, &zip_clear_fops);
-	if (!zip_clear)
-		goto failed_to_create;
-
-	zip_regs = debugfs_create_file("zip_regs", 0444,
-				       zip_debugfs_root,
-				       NULL, &zip_regs_fops);
-	if (!zip_regs)
-		goto failed_to_create;
+	debugfs_create_file("zip_stats", 0444, zip_debugfs_root, NULL,
+			    &zip_stats_fops);
 
-	return 0;
+	debugfs_create_file("zip_clear", 0444, zip_debugfs_root, NULL,
+			    &zip_clear_fops);
+
+	debugfs_create_file("zip_regs", 0444, zip_debugfs_root, NULL,
+			    &zip_regs_fops);
 
-failed_to_create:
-	debugfs_remove_recursive(zip_debugfs_root);
-	return -ENOENT;
 }
 
 static void __exit zip_debugfs_exit(void)
@@ -661,13 +643,8 @@ static void __exit zip_debugfs_exit(void)
 }
 
 #else
-static int __init zip_debugfs_init(void)
-{
-	return 0;
-}
-
+static void __init zip_debugfs_init(void) { }
 static void __exit zip_debugfs_exit(void) { }
-
 #endif
 /* debugfs - end */
 
@@ -691,17 +668,10 @@ static int __init zip_init_module(void)
 	}
 
 	/* comp-decomp statistics are handled with debugfs interface */
-	ret = zip_debugfs_init();
-	if (ret < 0) {
-		zip_err("ZIP: debugfs initialization failed\n");
-		goto err_crypto_unregister;
-	}
+	zip_debugfs_init();
 
 	return ret;
 
-err_crypto_unregister:
-	zip_unregister_compression_device();
-
 err_pci_unregister:
 	pci_unregister_driver(&zip_driver);
 	return ret;
-- 
2.20.1