1 files changed, 175 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches-4.0/706-net-stmmac-create-one-debugfs-dir-per-net-device.patch b/target/linux/ipq806x/patches-4.0/706-net-stmmac-create-one-debugfs-dir-per-net-device.patch
new file mode 100644
index 0000000000..a9a2d556aa
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.0/706-net-stmmac-create-one-debugfs-dir-per-net-device.patch
@@ -0,0 +1,175 @@
+From df944689d491e6af533173bf2ef448c3dd334f15 Mon Sep 17 00:00:00 2001
+From: Mathieu Olivari <mathieu@codeaurora.org>
+Date: Mon, 11 May 2015 15:15:25 -0700
+Subject: [PATCH 6/8] net: stmmac: create one debugfs dir per net-device
+
+stmmac DebugFS entries are currently global to the driver. As a result,
+having more than one stmmac device in the system creates the following
+error:
+* ERROR stmmaceth, debugfs create directory failed
+* stmmac_hw_setup: failed debugFS registration
+
+This also results in being able to access the debugfs information for
+the first registered device only.
+
+This patch changes the debugfs structure to have one sub-directory per
+net-device. Files under "/sys/kernel/debug/stmmaceth" will now show-up
+under /sys/kernel/debug/stmmaceth/ethN/.
+
+Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
+---
+ drivers/net/ethernet/stmicro/stmmac/stmmac.h      |  6 ++
+ drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 76 ++++++++++++++++-------
+ 2 files changed, 59 insertions(+), 23 deletions(-)
+
+--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
++++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+@@ -116,6 +116,12 @@ struct stmmac_priv {
+ 	int use_riwt;
+ 	int irq_wake;
+ 	spinlock_t ptp_lock;
++
++#ifdef CONFIG_DEBUG_FS
++	struct dentry *dbgfs_dir;
++	struct dentry *dbgfs_rings_status;
++	struct dentry *dbgfs_dma_cap;
++#endif
+ };
+ 
+ int stmmac_mdio_unregister(struct net_device *ndev);
+--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
++++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+@@ -119,7 +119,7 @@ static irqreturn_t stmmac_interrupt(int
+ 
+ #ifdef CONFIG_DEBUG_FS
+ static int stmmac_init_fs(struct net_device *dev);
+-static void stmmac_exit_fs(void);
++static void stmmac_exit_fs(struct net_device *dev);
+ #endif
+ 
+ #define STMMAC_COAL_TIMER(x) (jiffies + usecs_to_jiffies(x))
+@@ -1918,7 +1918,7 @@ static int stmmac_release(struct net_dev
+ 	netif_carrier_off(dev);
+ 
+ #ifdef CONFIG_DEBUG_FS
+-	stmmac_exit_fs();
++	stmmac_exit_fs(dev);
+ #endif
+ 
+ 	stmmac_release_ptp(priv);
+@@ -2510,8 +2510,6 @@ static int stmmac_ioctl(struct net_devic
+ 
+ #ifdef CONFIG_DEBUG_FS
+ static struct dentry *stmmac_fs_dir;
+-static struct dentry *stmmac_rings_status;
+-static struct dentry *stmmac_dma_cap;
+ 
+ static void sysfs_display_ring(void *head, int size, int extend_desc,
+ 			       struct seq_file *seq)
+@@ -2650,36 +2648,39 @@ static const struct file_operations stmm
+ 
+ static int stmmac_init_fs(struct net_device *dev)
+ {
+-	/* Create debugfs entries */
+-	stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);
++	struct stmmac_priv *priv = netdev_priv(dev);
++
++	/* Create per netdev entries */
++	priv->dbgfs_dir = debugfs_create_dir(dev->name, stmmac_fs_dir);
+ 
+-	if (!stmmac_fs_dir || IS_ERR(stmmac_fs_dir)) {
+-		pr_err("ERROR %s, debugfs create directory failed\n",
+-		       STMMAC_RESOURCE_NAME);
++	if (!priv->dbgfs_dir || IS_ERR(priv->dbgfs_dir)) {
++		pr_err("ERROR %s/%s, debugfs create directory failed\n",
++		       STMMAC_RESOURCE_NAME, dev->name);
+ 
+ 		return -ENOMEM;
+ 	}
+ 
+ 	/* Entry to report DMA RX/TX rings */
+-	stmmac_rings_status = debugfs_create_file("descriptors_status",
+-						  S_IRUGO, stmmac_fs_dir, dev,
+-						  &stmmac_rings_status_fops);
++	priv->dbgfs_rings_status =
++		debugfs_create_file("descriptors_status", S_IRUGO,
++				    priv->dbgfs_dir, dev,
++				    &stmmac_rings_status_fops);
+ 
+-	if (!stmmac_rings_status || IS_ERR(stmmac_rings_status)) {
++	if (!priv->dbgfs_rings_status || IS_ERR(priv->dbgfs_rings_status)) {
+ 		pr_info("ERROR creating stmmac ring debugfs file\n");
+-		debugfs_remove(stmmac_fs_dir);
++		debugfs_remove_recursive(priv->dbgfs_dir);
+ 
+ 		return -ENOMEM;
+ 	}
+ 
+ 	/* Entry to report the DMA HW features */
+-	stmmac_dma_cap = debugfs_create_file("dma_cap", S_IRUGO, stmmac_fs_dir,
+-					     dev, &stmmac_dma_cap_fops);
++	priv->dbgfs_dma_cap = debugfs_create_file("dma_cap", S_IRUGO,
++					    priv->dbgfs_dir,
++					    dev, &stmmac_dma_cap_fops);
+ 
+-	if (!stmmac_dma_cap || IS_ERR(stmmac_dma_cap)) {
++	if (!priv->dbgfs_dma_cap || IS_ERR(priv->dbgfs_dma_cap)) {
+ 		pr_info("ERROR creating stmmac MMC debugfs file\n");
+-		debugfs_remove(stmmac_rings_status);
+-		debugfs_remove(stmmac_fs_dir);
++		debugfs_remove_recursive(priv->dbgfs_dir);
+ 
+ 		return -ENOMEM;
+ 	}
+@@ -2687,11 +2688,11 @@ static int stmmac_init_fs(struct net_dev
+ 	return 0;
+ }
+ 
+-static void stmmac_exit_fs(void)
++static void stmmac_exit_fs(struct net_device *dev)
+ {
+-	debugfs_remove(stmmac_rings_status);
+-	debugfs_remove(stmmac_dma_cap);
+-	debugfs_remove(stmmac_fs_dir);
++	struct stmmac_priv *priv = netdev_priv(dev);
++
++	debugfs_remove_recursive(priv->dbgfs_dir);
+ }
+ #endif /* CONFIG_DEBUG_FS */
+ 
+@@ -3136,6 +3137,35 @@ err:
+ __setup("stmmaceth=", stmmac_cmdline_opt);
+ #endif /* MODULE */
+ 
++static int __init stmmac_init(void)
++{
++#ifdef CONFIG_DEBUG_FS
++	/* Create debugfs main directory if it doesn't exist yet */
++	if (stmmac_fs_dir == NULL) {
++		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;
++}
++
++static void __exit stmmac_exit(void)
++{
++#ifdef CONFIG_DEBUG_FS
++	debugfs_remove_recursive(stmmac_fs_dir);
++#endif
++}
++
++module_init(stmmac_init)
++module_exit(stmmac_exit)
++
+ MODULE_DESCRIPTION("STMMAC 10/100/1000 Ethernet device driver");
+ MODULE_AUTHOR("Giuseppe Cavallaro <peppe.cavallaro@st.com>");
+ MODULE_LICENSE("GPL");