From 1dcd5696204af6f2f5e2a89d6ef7560a74cd41e7 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 29 May 2018 17:31:00 +0200
Subject: [PATCH] USB: dwc2: 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: Minas Harutyunyan <hminas@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/dwc2/debugfs.c | 78 ++++++++------------------------------
 1 file changed, 16 insertions(+), 62 deletions(-)

diff --git a/drivers/usb/dwc2/debugfs.c b/drivers/usb/dwc2/debugfs.c
index 7e6618ad9f21..d0bdb7997557 100644
--- a/drivers/usb/dwc2/debugfs.c
+++ b/drivers/usb/dwc2/debugfs.c
@@ -294,52 +294,30 @@ DEFINE_SHOW_ATTRIBUTE(ep);
 static void dwc2_hsotg_create_debug(struct dwc2_hsotg *hsotg)
 {
 	struct dentry *root;
-	struct dentry *file;
 	unsigned int epidx;
 
 	root = hsotg->debug_root;
 
 	/* create general state file */
-
-	file = debugfs_create_file("state", 0444, root, hsotg, &state_fops);
-	if (IS_ERR(file))
-		dev_err(hsotg->dev, "%s: failed to create state\n", __func__);
-
-	file = debugfs_create_file("testmode", 0644, root, hsotg,
-				   &testmode_fops);
-	if (IS_ERR(file))
-		dev_err(hsotg->dev, "%s: failed to create testmode\n",
-			__func__);
-
-	file = debugfs_create_file("fifo", 0444, root, hsotg, &fifo_fops);
-	if (IS_ERR(file))
-		dev_err(hsotg->dev, "%s: failed to create fifo\n", __func__);
+	debugfs_create_file("state", 0444, root, hsotg, &state_fops);
+	debugfs_create_file("testmode", 0644, root, hsotg, &testmode_fops);
+	debugfs_create_file("fifo", 0444, root, hsotg, &fifo_fops);
 
 	/* Create one file for each out endpoint */
 	for (epidx = 0; epidx < hsotg->num_of_eps; epidx++) {
 		struct dwc2_hsotg_ep *ep;
 
 		ep = hsotg->eps_out[epidx];
-		if (ep) {
-			file = debugfs_create_file(ep->name, 0444,
-						   root, ep, &ep_fops);
-			if (IS_ERR(file))
-				dev_err(hsotg->dev, "failed to create %s debug file\n",
-					ep->name);
-		}
+		if (ep)
+			debugfs_create_file(ep->name, 0444, root, ep, &ep_fops);
 	}
 	/* Create one file for each in endpoint. EP0 is handled with out eps */
 	for (epidx = 1; epidx < hsotg->num_of_eps; epidx++) {
 		struct dwc2_hsotg_ep *ep;
 
 		ep = hsotg->eps_in[epidx];
-		if (ep) {
-			file = debugfs_create_file(ep->name, 0444,
-						   root, ep, &ep_fops);
-			if (IS_ERR(file))
-				dev_err(hsotg->dev, "failed to create %s debug file\n",
-					ep->name);
-		}
+		if (ep)
+			debugfs_create_file(ep->name, 0444, root, ep, &ep_fops);
 	}
 }
 #else
@@ -792,32 +770,14 @@ DEFINE_SHOW_ATTRIBUTE(dr_mode);
 int dwc2_debugfs_init(struct dwc2_hsotg *hsotg)
 {
 	int			ret;
-	struct dentry		*file;
+	struct dentry		*root;
 
-	hsotg->debug_root = debugfs_create_dir(dev_name(hsotg->dev), NULL);
-	if (!hsotg->debug_root) {
-		ret = -ENOMEM;
-		goto err0;
-	}
+	root = debugfs_create_dir(dev_name(hsotg->dev), NULL);
+	hsotg->debug_root = root;
 
-	file = debugfs_create_file("params", 0444,
-				   hsotg->debug_root,
-				   hsotg, &params_fops);
-	if (IS_ERR(file))
-		dev_err(hsotg->dev, "%s: failed to create params\n", __func__);
-
-	file = debugfs_create_file("hw_params", 0444,
-				   hsotg->debug_root,
-				   hsotg, &hw_params_fops);
-	if (IS_ERR(file))
-		dev_err(hsotg->dev, "%s: failed to create hw_params\n",
-			__func__);
-
-	file = debugfs_create_file("dr_mode", 0444,
-				   hsotg->debug_root,
-				   hsotg, &dr_mode_fops);
-	if (IS_ERR(file))
-		dev_err(hsotg->dev, "%s: failed to create dr_mode\n", __func__);
+	debugfs_create_file("params", 0444, root, hsotg, &params_fops);
+	debugfs_create_file("hw_params", 0444, root, hsotg, &hw_params_fops);
+	debugfs_create_file("dr_mode", 0444, root, hsotg, &dr_mode_fops);
 
 	/* Add gadget debugfs nodes */
 	dwc2_hsotg_create_debug(hsotg);
@@ -826,24 +786,18 @@ int dwc2_debugfs_init(struct dwc2_hsotg *hsotg)
 								GFP_KERNEL);
 	if (!hsotg->regset) {
 		ret = -ENOMEM;
-		goto err1;
+		goto err;
 	}
 
 	hsotg->regset->regs = dwc2_regs;
 	hsotg->regset->nregs = ARRAY_SIZE(dwc2_regs);
 	hsotg->regset->base = hsotg->regs;
 
-	file = debugfs_create_regset32("regdump", 0444, hsotg->debug_root,
-				       hsotg->regset);
-	if (!file) {
-		ret = -ENOMEM;
-		goto err1;
-	}
+	debugfs_create_regset32("regdump", 0444, root, hsotg->regset);
 
 	return 0;
-err1:
+err:
 	debugfs_remove_recursive(hsotg->debug_root);
-err0:
 	return ret;
 }