[Linux-stm32] [PATCH stmmac 4.19 1/2] stmmac: no need to check return value of debugfs_create functions

[hsimeliere.opensource at witekio.com]

From: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

[ Upstream commit 8d72ab119f42f25abb393093472ae0ca275088b6 ]

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.

Because we don't care about the individual files, we can remove the
stored dentry for the files, as they are not needed to be kept track of
at all.

Cc: Giuseppe Cavallaro <peppe.cavallaro at st.com>
Cc: Alexandre Torgue <alexandre.torgue at st.com>
Cc: Jose Abreu <joabreu at synopsys.com>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
Cc: netdev at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Hugo SIMELIERE <hsimeliere.opensource at witekio.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac.h  |  2 -
 .../net/ethernet/stmicro/stmmac/stmmac_main.c | 52 +++----------------
 2 files changed, 8 insertions(+), 46 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index 63e1064b27a2..5ec268817ee4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -188,8 +188,6 @@ struct stmmac_priv {
 
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *dbgfs_dir;
-	struct dentry *dbgfs_rings_status;
-	struct dentry *dbgfs_dma_cap;
 #endif
 
 	unsigned long state;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3e35cdf0d2b7..6ee9c447ac43 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -115,7 +115,7 @@ static irqreturn_t stmmac_interrupt(int irq, void *dev_id);
 
 #ifdef CONFIG_DEBUG_FS
 static const struct net_device_ops stmmac_netdev_ops;
-static int stmmac_init_fs(struct net_device *dev);
+static void stmmac_init_fs(struct net_device *dev);
 static void stmmac_exit_fs(struct net_device *dev);
 #endif
 
@@ -4063,47 +4063,22 @@ static struct notifier_block stmmac_notifier = {
 	.notifier_call = stmmac_device_event,
 };
 
-static int stmmac_init_fs(struct net_device *dev)
+static void stmmac_init_fs(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
 
 	/* Create per netdev entries */
 	priv->dbgfs_dir = debugfs_create_dir(dev->name, stmmac_fs_dir);
 
-	if (!priv->dbgfs_dir || IS_ERR(priv->dbgfs_dir)) {
-		netdev_err(priv->dev, "ERROR failed to create debugfs directory\n");
-
-		return -ENOMEM;
-	}
-
 	/* Entry to report DMA RX/TX rings */
-	priv->dbgfs_rings_status =
-		debugfs_create_file("descriptors_status", 0444,
-				    priv->dbgfs_dir, dev,
-				    &stmmac_rings_status_fops);
-
-	if (!priv->dbgfs_rings_status || IS_ERR(priv->dbgfs_rings_status)) {
-		netdev_err(priv->dev, "ERROR creating stmmac ring debugfs file\n");
-		debugfs_remove_recursive(priv->dbgfs_dir);
-
-		return -ENOMEM;
-	}
+	debugfs_create_file("descriptors_status", 0444, priv->dbgfs_dir, dev,
+			    &stmmac_rings_status_fops);
 
 	/* Entry to report the DMA HW features */
-	priv->dbgfs_dma_cap = debugfs_create_file("dma_cap", 0444,
-						  priv->dbgfs_dir,
-						  dev, &stmmac_dma_cap_fops);
-
-	if (!priv->dbgfs_dma_cap || IS_ERR(priv->dbgfs_dma_cap)) {
-		netdev_err(priv->dev, "ERROR creating stmmac MMC debugfs file\n");
-		debugfs_remove_recursive(priv->dbgfs_dir);
-
-		return -ENOMEM;
-	}
+	debugfs_create_file("dma_cap", 0444, priv->dbgfs_dir, dev,
+			    &stmmac_dma_cap_fops);
 
 	register_netdevice_notifier(&stmmac_notifier);
-
-	return 0;
 }
 
 static void stmmac_exit_fs(struct net_device *dev)
@@ -4442,10 +4417,7 @@ int stmmac_dvr_probe(struct device *device,
 	}
 
 #ifdef CONFIG_DEBUG_FS
-	ret = stmmac_init_fs(ndev);
-	if (ret < 0)
-		netdev_warn(priv->dev, "%s: failed debugFS registration\n",
-			    __func__);
+	stmmac_init_fs(ndev);
 #endif
 
 	return ret;
@@ -4705,16 +4677,8 @@ static int __init stmmac_init(void)
 {
 #ifdef CONFIG_DEBUG_FS
 	/* Create debugfs main directory if it doesn't exist yet */
-	if (!stmmac_fs_dir) {
+	if (!stmmac_fs_dir)
 		stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
-
-		if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
-			pr_err("ERROR %s, debugfs create directory failed\n",
-			       STMMAC_RESOURCE_NAME);
-
-			return -ENOMEM;
-		}
-	}
 #endif
 
 	return 0;
-- 
2.25.1