netdev - [PATCH] mediatek/mt7601u: add debugfs exit function

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Message-Id: <20220422070325.465918-1-zhaojunkui2008@126.com>
Date:   Fri, 22 Apr 2022 00:03:25 -0700
From:   Bernard Zhao <zhaojunkui2008@....com>
To:     Jakub Kicinski <kubakici@...pl>, Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     bernard@...o.com, Bernard Zhao <zhaojunkui2008@....com>
Subject: [PATCH] mediatek/mt7601u: add debugfs exit function

When mt7601u loaded, there are two cases:
First when mt7601u is loaded, in function mt7601u_probe, if
function mt7601u_probe run into error lable err_hw,
mt7601u_cleanup didn`t cleanup the debugfs node.
Second when the module disconnect, in function mt7601u_disconnect,
mt7601u_cleanup didn`t cleanup the debugfs node.
This patch add debugfs exit function and try to cleanup debugfs
node when mt7601u loaded fail or unloaded.

Signed-off-by: Bernard Zhao <zhaojunkui2008@....com>
---
 .../net/wireless/mediatek/mt7601u/debugfs.c   | 25 +++++++++++--------
 drivers/net/wireless/mediatek/mt7601u/init.c  |  5 ++++
 .../net/wireless/mediatek/mt7601u/mt7601u.h   |  4 +++
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/debugfs.c b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
index 20669eacb66e..1ae3d75d3c9b 100644
--- a/drivers/net/wireless/mediatek/mt7601u/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
@@ -124,17 +124,22 @@ DEFINE_SHOW_ATTRIBUTE(mt7601u_eeprom_param);
 
 void mt7601u_init_debugfs(struct mt7601u_dev *dev)
 {
-	struct dentry *dir;
-
-	dir = debugfs_create_dir("mt7601u", dev->hw->wiphy->debugfsdir);
-	if (!dir)
+	dev->root_dir = debugfs_create_dir("mt7601u", dev->hw->wiphy->debugfsdir);
+	if (!dev->root_dir)
 		return;
 
-	debugfs_create_u8("temperature", 0400, dir, &dev->raw_temp);
-	debugfs_create_u32("temp_mode", 0400, dir, &dev->temp_mode);
+	debugfs_create_u8("temperature", 0400, dev->root_dir, &dev->raw_temp);
+	debugfs_create_u32("temp_mode", 0400, dev->root_dir, &dev->temp_mode);
+
+	debugfs_create_u32("regidx", 0600, dev->root_dir, &dev->debugfs_reg);
+	debugfs_create_file("regval", 0600, dev->root_dir, dev, &fops_regval);
+	debugfs_create_file("ampdu_stat", 0400, dev->root_dir, dev, &mt7601u_ampdu_stat_fops);
+	debugfs_create_file("eeprom_param", 0400, dev->root_dir, dev, &mt7601u_eeprom_param_fops);
+}
 
-	debugfs_create_u32("regidx", 0600, dir, &dev->debugfs_reg);
-	debugfs_create_file("regval", 0600, dir, dev, &fops_regval);
-	debugfs_create_file("ampdu_stat", 0400, dir, dev, &mt7601u_ampdu_stat_fops);
-	debugfs_create_file("eeprom_param", 0400, dir, dev, &mt7601u_eeprom_param_fops);
+void mt7601u_exit_debugfs(struct mt7601u_dev *dev)
+{
+	if (!dev->root_dir)
+		return;
+	debugfs_remove(dev->root_dir);
 }
diff --git a/drivers/net/wireless/mediatek/mt7601u/init.c b/drivers/net/wireless/mediatek/mt7601u/init.c
index 5d9e952b2966..1e905ef2ed19 100644
--- a/drivers/net/wireless/mediatek/mt7601u/init.c
+++ b/drivers/net/wireless/mediatek/mt7601u/init.c
@@ -427,6 +427,9 @@ void mt7601u_cleanup(struct mt7601u_dev *dev)
 	mt7601u_stop_hardware(dev);
 	mt7601u_dma_cleanup(dev);
 	mt7601u_mcu_cmd_deinit(dev);
+#ifdef CONFIG_DEBUG_FS
+	mt7601u_exit_debugfs(dev);
+#endif
 }
 
 struct mt7601u_dev *mt7601u_alloc_device(struct device *pdev)
@@ -625,7 +628,9 @@ int mt7601u_register_device(struct mt7601u_dev *dev)
 	if (ret)
 		return ret;
 
+#ifdef CONFIG_DEBUG_FS
 	mt7601u_init_debugfs(dev);
+#endif
 
 	return 0;
 }
diff --git a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
index a122f1dd38f6..c5f06818bb35 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
+++ b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
@@ -242,6 +242,9 @@ struct mt7601u_dev {
 	u32 rf_pa_mode[2];
 
 	struct mac_stats stats;
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *root_dir;
+#endif
 };
 
 struct mt7601u_tssi_params {
@@ -279,6 +282,7 @@ struct mt7601u_rxwi;
 extern const struct ieee80211_ops mt7601u_ops;
 
 void mt7601u_init_debugfs(struct mt7601u_dev *dev);
+void mt7601u_exit_debugfs(struct mt7601u_dev *dev);
 
 u32 mt7601u_rr(struct mt7601u_dev *dev, u32 offset);
 void mt7601u_wr(struct mt7601u_dev *dev, u32 offset, u32 val);
-- 
2.33.1