From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Tue, 18 Aug 2020 15:37:39 +0200
Subject: PCI: tegra: No need to check return value of debugfs_create()
 functions

Git-commit: d27b1cdc10e7b2d8611b83e8db92eb7dc13d0cd5
Patch-mainline: v5.10-rc1
References: bsc#1179344

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.

Link: https://lore.kernel.org/r/20200818133739.463193-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Vidya Sagar <vidyas@nvidia.com>
Cc: Andrew Murray <amurray@thegoodpenguin.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-pci@vger.kernel.org
Cc: linux-tegra@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
---
 drivers/pci/controller/dwc/pcie-tegra194.c |   20 +++++---------------
 drivers/pci/controller/pci-tegra.c         |   25 +++++--------------------
 2 files changed, 10 insertions(+), 35 deletions(-)

--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -689,23 +689,16 @@ static void init_host_aspm(struct tegra_
 	dw_pcie_writel_dbi(pci, PCIE_PORT_AFR, val);
 }
 
-static int init_debugfs(struct tegra_pcie_dw *pcie)
+static void init_debugfs(struct tegra_pcie_dw *pcie)
 {
-	struct dentry *d;
-
-	d = debugfs_create_devm_seqfile(pcie->dev, "aspm_state_cnt",
-					pcie->debugfs, aspm_state_cnt);
-	if (IS_ERR_OR_NULL(d))
-		dev_err(pcie->dev,
-			"Failed to create debugfs file \"aspm_state_cnt\"\n");
-
-	return 0;
+	debugfs_create_devm_seqfile(pcie->dev, "aspm_state_cnt", pcie->debugfs,
+				    aspm_state_cnt);
 }
 #else
 static inline void disable_aspm_l12(struct tegra_pcie_dw *pcie) { return; }
 static inline void disable_aspm_l11(struct tegra_pcie_dw *pcie) { return; }
 static inline void init_host_aspm(struct tegra_pcie_dw *pcie) { return; }
-static inline int init_debugfs(struct tegra_pcie_dw *pcie) { return 0; }
+static inline void init_debugfs(struct tegra_pcie_dw *pcie) { return; }
 #endif
 
 static void tegra_pcie_enable_system_interrupts(struct pcie_port *pp)
@@ -1631,10 +1624,7 @@ static int tegra_pcie_config_rp(struct t
 	}
 
 	pcie->debugfs = debugfs_create_dir(name, NULL);
-	if (!pcie->debugfs)
-		dev_err(dev, "Failed to create debugfs\n");
-	else
-		init_debugfs(pcie);
+	init_debugfs(pcie);
 
 	return ret;
 
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -2603,24 +2603,12 @@ static void tegra_pcie_debugfs_exit(stru
 	pcie->debugfs = NULL;
 }
 
-static int tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
+static void tegra_pcie_debugfs_init(struct tegra_pcie *pcie)
 {
-	struct dentry *file;
-
 	pcie->debugfs = debugfs_create_dir("pcie", NULL);
-	if (!pcie->debugfs)
-		return -ENOMEM;
-
-	file = debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs,
-				   pcie, &tegra_pcie_ports_ops);
-	if (!file)
-		goto remove;
 
-	return 0;
-
-remove:
-	tegra_pcie_debugfs_exit(pcie);
-	return -ENOMEM;
+	debugfs_create_file("ports", S_IFREG | S_IRUGO, pcie->debugfs, pcie,
+			    &tegra_pcie_ports_ops);
 }
 
 static int tegra_pcie_probe(struct platform_device *pdev)
@@ -2674,11 +2662,8 @@ static int tegra_pcie_probe(struct platf
 		goto pm_runtime_put;
 	}
 
-	if (IS_ENABLED(CONFIG_DEBUG_FS)) {
-		err = tegra_pcie_debugfs_init(pcie);
-		if (err < 0)
-			dev_err(dev, "failed to setup debugfs: %d\n", err);
-	}
+	if (IS_ENABLED(CONFIG_DEBUG_FS))
+		tegra_pcie_debugfs_init(pcie);
 
 	return 0;