powerpc: pseries: 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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/20191014101642.GA30179@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 10 insertions, 55 deletions

diff --git a/arch/powerpc/platforms/pseries/dtl.c b/arch/powerpc/platforms/pseries/dtl.c
index 2b87480f2837..eab8aa293743 100644
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -19,7 +19,6 @@
 
 struct dtl {
 	struct dtl_entry	*buf;
-	struct dentry		*file;
 	int			cpu;
 	int			buf_entries;
 	u64			last_idx;
@@ -320,46 +319,28 @@ static const struct file_operations dtl_fops = {
 
 static struct dentry *dtl_dir;
 
-static int dtl_setup_file(struct dtl *dtl)
+static void dtl_setup_file(struct dtl *dtl)
 {
 	char name[10];
 
 	sprintf(name, "cpu-%d", dtl->cpu);
 
-	dtl->file = debugfs_create_file(name, 0400, dtl_dir, dtl, &dtl_fops);
-	if (!dtl->file)
-		return -ENOMEM;
-
-	return 0;
+	debugfs_create_file(name, 0400, dtl_dir, dtl, &dtl_fops);
 }
 
 static int dtl_init(void)
 {
-	struct dentry *event_mask_file, *buf_entries_file;
-	int rc, i;
+	int i;
 
 	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 		return -ENODEV;
 
 	/* set up common debugfs structure */
 
-	rc = -ENOMEM;
 	dtl_dir = debugfs_create_dir("dtl", powerpc_debugfs_root);
-	if (!dtl_dir) {
-		printk(KERN_WARNING "%s: can't create dtl root dir\n",
-				__func__);
-		goto err;
-	}
 
-	event_mask_file = debugfs_create_x8("dtl_event_mask", 0600,
-				dtl_dir, &dtl_event_mask);
-	buf_entries_file = debugfs_create_u32("dtl_buf_entries", 0400,
-				dtl_dir, &dtl_buf_entries);
-
-	if (!event_mask_file || !buf_entries_file) {
-		printk(KERN_WARNING "%s: can't create dtl files\n", __func__);
-		goto err_remove_dir;
-	}
+	debugfs_create_x8("dtl_event_mask", 0600, dtl_dir, &dtl_event_mask);
+	debugfs_create_u32("dtl_buf_entries", 0400, dtl_dir, &dtl_buf_entries);
 
 	/* set up the per-cpu log structures */
 	for_each_possible_cpu(i) {
@@ -367,16 +348,9 @@ static int dtl_init(void)
 		spin_lock_init(&dtl->lock);
 		dtl->cpu = i;
 
-		rc = dtl_setup_file(dtl);
-		if (rc)
-			goto err_remove_dir;
+		dtl_setup_file(dtl);
 	}
 
 	return 0;
-
-err_remove_dir:
-	debugfs_remove_recursive(dtl_dir);
-err:
-	return rc;
 }
 machine_arch_initcall(pseries, dtl_init);
diff --git a/arch/powerpc/platforms/pseries/hvCall_inst.c b/arch/powerpc/platforms/pseries/hvCall_inst.c
index bcc1b67417a8..c40c62ec432e 100644
--- a/arch/powerpc/platforms/pseries/hvCall_inst.c
+++ b/arch/powerpc/platforms/pseries/hvCall_inst.c
@@ -129,7 +129,6 @@ static void probe_hcall_exit(void *ignored, unsigned long opcode, long retval,
 static int __init hcall_inst_init(void)
 {
 	struct dentry *hcall_root;
-	struct dentry *hcall_file;
 	char cpu_name_buf[CPU_NAME_BUF_SIZE];
 	int cpu;
 
@@ -145,17 +144,12 @@ static int __init hcall_inst_init(void)
 	}
 
 	hcall_root = debugfs_create_dir(HCALL_ROOT_DIR, NULL);
-	if (!hcall_root)
-		return -ENOMEM;
 
 	for_each_possible_cpu(cpu) {
 		snprintf(cpu_name_buf, CPU_NAME_BUF_SIZE, "cpu%d", cpu);
-		hcall_file = debugfs_create_file(cpu_name_buf, 0444,
-						 hcall_root,
-						 per_cpu(hcall_stats, cpu),
-						 &hcall_inst_seq_fops);
-		if (!hcall_file)
-			return -ENOMEM;
+		debugfs_create_file(cpu_name_buf, 0444, hcall_root,
+				    per_cpu(hcall_stats, cpu),
+				    &hcall_inst_seq_fops);
 	}
 
 	return 0;
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index f87a5c64e24d..f9f57c55655e 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -1998,24 +1998,11 @@ static int __init vpa_debugfs_init(void)
 		return 0;
 
 	vpa_dir = debugfs_create_dir("vpa", powerpc_debugfs_root);
-	if (!vpa_dir) {
-		pr_warn("%s: can't create vpa root dir\n", __func__);
-		return -ENOMEM;
-	}
 
 	/* set up the per-cpu vpa file*/
 	for_each_possible_cpu(i) {
-		struct dentry *d;
-
 		sprintf(name, "cpu-%ld", i);
-
-		d = debugfs_create_file(name, 0400, vpa_dir, (void *)i,
-					&vpa_fops);
-		if (!d) {
-			pr_warn("%s: can't create per-cpu vpa file\n",
-					__func__);
-			return -ENOMEM;
-		}
+		debugfs_create_file(name, 0400, vpa_dir, (void *)i, &vpa_fops);
 	}
 
 	return 0;