This is a note to let you know that I've just added the patch titled
stmmac: no need to check return value of debugfs_create functions
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
stmmac-no-need-to-check-return-value-of-debugfs_create-functions.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8d72ab119f42f25abb393093472ae0ca275088b6 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 10 Aug 2019 12:17:24 +0200
Subject: stmmac: no need to check return value of debugfs_create functions
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
commit 8d72ab119f42f25abb393093472ae0ca275088b6 upstream.
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@xxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxx>
Cc: Jose Abreu <joabreu@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: linux-stm32@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Hugo SIMELIERE <hsimeliere.opensource@xxxxxxxxxxx>
Reviewed-by: Jacob Keller <jacob.e.keller@xxxxxxxxx>
Stable-dep-of: 474a31e13a4e ("net: stmmac: fix notifier registration")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/stmmac.h | 2
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 52 +++-------------------
2 files changed, 8 insertions(+), 46 deletions(-)
--- 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;
--- 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
#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_noti
.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 *devi
}
#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;
Patches currently in stable-queue which might be from gregkh@xxxxxxxxxxxxxxxxxxx are
queue-4.19/stmmac-no-need-to-check-return-value-of-debugfs_create-functions.patch
queue-4.19/memcg-add-refcnt-for-pcpu-stock-to-avoid-uaf-problem-in-drain_all_stock.patch
queue-4.19/net-sched-retire-atm-qdisc.patch
queue-4.19/net-sched-retire-dsmark-qdisc.patch
queue-4.19/net-sched-retire-cbq-qdisc.patch
queue-4.19/net-stmmac-fix-notifier-registration.patch
