[PATCH v2] mediatek/mt7601u: add debugfs exit function

[PATCH v2] mediatek/mt7601u: add debugfs exit function

[Bernard Zhao]

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@126.com>

Changes since V1:
*Remove CONFIG_DEBUG_FS check.
---
 .../net/wireless/mediatek/mt7601u/debugfs.c   | 23 +++++++++++--------
 drivers/net/wireless/mediatek/mt7601u/init.c  |  1 +
 .../net/wireless/mediatek/mt7601u/mt7601u.h   |  3 +++
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/debugfs.c b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
index 20669eacb66e..efc575a1147c 100644
--- a/drivers/net/wireless/mediatek/mt7601u/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
@@ -124,17 +124,20 @@ 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)
+{
+	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..eacdd5785fa6 100644
--- a/drivers/net/wireless/mediatek/mt7601u/init.c
+++ b/drivers/net/wireless/mediatek/mt7601u/init.c
@@ -427,6 +427,7 @@ void mt7601u_cleanup(struct mt7601u_dev *dev)
 	mt7601u_stop_hardware(dev);
 	mt7601u_dma_cleanup(dev);
 	mt7601u_mcu_cmd_deinit(dev);
+	mt7601u_exit_debugfs(dev);
 }
 
 struct mt7601u_dev *mt7601u_alloc_device(struct device *pdev)
diff --git a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
index a122f1dd38f6..06c190a3f54c 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
+++ b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
@@ -242,6 +242,8 @@ struct mt7601u_dev {
 	u32 rf_pa_mode[2];
 
 	struct mac_stats stats;
+
+	struct dentry *root_dir;
 };
 
 struct mt7601u_tssi_params {
@@ -279,6 +281,7 @@ 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

[PATCH v2] mediatek/mt7601u: add debugfs exit function

[Bernard Zhao]

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@126.com>

Changes since V1:
*Remove CONFIG_DEBUG_FS check.
---
 .../net/wireless/mediatek/mt7601u/debugfs.c   | 23 +++++++++++--------
 drivers/net/wireless/mediatek/mt7601u/init.c  |  1 +
 .../net/wireless/mediatek/mt7601u/mt7601u.h   |  3 +++
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/debugfs.c b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
index 20669eacb66e..efc575a1147c 100644
--- a/drivers/net/wireless/mediatek/mt7601u/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
@@ -124,17 +124,20 @@ 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)
+{
+	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..eacdd5785fa6 100644
--- a/drivers/net/wireless/mediatek/mt7601u/init.c
+++ b/drivers/net/wireless/mediatek/mt7601u/init.c
@@ -427,6 +427,7 @@ void mt7601u_cleanup(struct mt7601u_dev *dev)
 	mt7601u_stop_hardware(dev);
 	mt7601u_dma_cleanup(dev);
 	mt7601u_mcu_cmd_deinit(dev);
+	mt7601u_exit_debugfs(dev);
 }
 
 struct mt7601u_dev *mt7601u_alloc_device(struct device *pdev)
diff --git a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
index a122f1dd38f6..06c190a3f54c 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
+++ b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
@@ -242,6 +242,8 @@ struct mt7601u_dev {
 	u32 rf_pa_mode[2];
 
 	struct mac_stats stats;
+
+	struct dentry *root_dir;
 };
 
 struct mt7601u_tssi_params {
@@ -279,6 +281,7 @@ 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


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[PATCH v2] mediatek/mt7601u: add debugfs exit function

[Bernard Zhao]

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@126.com>

Changes since V1:
*Remove CONFIG_DEBUG_FS check.
---
 .../net/wireless/mediatek/mt7601u/debugfs.c   | 23 +++++++++++--------
 drivers/net/wireless/mediatek/mt7601u/init.c  |  1 +
 .../net/wireless/mediatek/mt7601u/mt7601u.h   |  3 +++
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt7601u/debugfs.c b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
index 20669eacb66e..efc575a1147c 100644
--- a/drivers/net/wireless/mediatek/mt7601u/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
@@ -124,17 +124,20 @@ 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)
+{
+	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..eacdd5785fa6 100644
--- a/drivers/net/wireless/mediatek/mt7601u/init.c
+++ b/drivers/net/wireless/mediatek/mt7601u/init.c
@@ -427,6 +427,7 @@ void mt7601u_cleanup(struct mt7601u_dev *dev)
 	mt7601u_stop_hardware(dev);
 	mt7601u_dma_cleanup(dev);
 	mt7601u_mcu_cmd_deinit(dev);
+	mt7601u_exit_debugfs(dev);
 }
 
 struct mt7601u_dev *mt7601u_alloc_device(struct device *pdev)
diff --git a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
index a122f1dd38f6..06c190a3f54c 100644
--- a/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
+++ b/drivers/net/wireless/mediatek/mt7601u/mt7601u.h
@@ -242,6 +242,8 @@ struct mt7601u_dev {
 	u32 rf_pa_mode[2];
 
 	struct mac_stats stats;
+
+	struct dentry *root_dir;
 };
 
 struct mt7601u_tssi_params {
@@ -279,6 +281,7 @@ 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


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Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[Jakub Kicinski]

On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
> 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@126.com>

Ah, missed that there was a v2. My point stands, wiphy debugfs dir
should do the cleanup.

Do you encounter problems in practice or are you sending this patches
based on reading / static analysis of the code only.

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Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[Jakub Kicinski]

On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
> 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@126.com>

Ah, missed that there was a v2. My point stands, wiphy debugfs dir
should do the cleanup.

Do you encounter problems in practice or are you sending this patches
based on reading / static analysis of the code only.

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Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[Jakub Kicinski]

On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
> 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@126.com>

Ah, missed that there was a v2. My point stands, wiphy debugfs dir
should do the cleanup.

Do you encounter problems in practice or are you sending this patches
based on reading / static analysis of the code only.

Re:Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[z]

At 2022-04-23 03:47:04, "Jakub Kicinski" <kubakici@wp.pl> wrote:
>On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
>> 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@126.com>
>
>Ah, missed that there was a v2. My point stands, wiphy debugfs dir
>should do the cleanup.
>
>Do you encounter problems in practice or are you sending this patches
>based on reading / static analysis of the code only.

Hi Jakub Kicinski:

The issue here is found by reading code.
I read the drivers/net/wireless code and found that many modules are not cleanup the debugfs. 
I sorted out the modules that were not cleaned up the debugfs:
./ti/wl18xx
./ti/wl12xx
./intel/iwlwifi
./intel/iwlwifi
./mediatek/mt76
I am not sure whether this part is welcome to kernel so I submitted a patch.
If you have any suggestions, welcome to put forward for discussion, thank you！

BR//Bernard

Re:Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[z]

At 2022-04-23 03:47:04, "Jakub Kicinski" <kubakici@wp.pl> wrote:
>On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
>> 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@126.com>
>
>Ah, missed that there was a v2. My point stands, wiphy debugfs dir
>should do the cleanup.
>
>Do you encounter problems in practice or are you sending this patches
>based on reading / static analysis of the code only.

Hi Jakub Kicinski:

The issue here is found by reading code.
I read the drivers/net/wireless code and found that many modules are not cleanup the debugfs. 
I sorted out the modules that were not cleaned up the debugfs:
./ti/wl18xx
./ti/wl12xx
./intel/iwlwifi
./intel/iwlwifi
./mediatek/mt76
I am not sure whether this part is welcome to kernel so I submitted a patch.
If you have any suggestions, welcome to put forward for discussion, thank you！

BR//Bernard

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Re:Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[z]

At 2022-04-23 03:47:04, "Jakub Kicinski" <kubakici@wp.pl> wrote:
>On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
>> 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@126.com>
>
>Ah, missed that there was a v2. My point stands, wiphy debugfs dir
>should do the cleanup.
>
>Do you encounter problems in practice or are you sending this patches
>based on reading / static analysis of the code only.

Hi Jakub Kicinski:

The issue here is found by reading code.
I read the drivers/net/wireless code and found that many modules are not cleanup the debugfs. 
I sorted out the modules that were not cleaned up the debugfs:
./ti/wl18xx
./ti/wl12xx
./intel/iwlwifi
./intel/iwlwifi
./mediatek/mt76
I am not sure whether this part is welcome to kernel so I submitted a patch.
If you have any suggestions, welcome to put forward for discussion, thank you！

BR//Bernard

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Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[Kalle Valo]

z  <zhaojunkui2008@126.com> writes:

> At 2022-04-23 03:47:04, "Jakub Kicinski" <kubakici@wp.pl> wrote:
>>On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
>>> 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@126.com>
>>
>>Ah, missed that there was a v2. My point stands, wiphy debugfs dir
>>should do the cleanup.
>>
>>Do you encounter problems in practice or are you sending this patches
>>based on reading / static analysis of the code only.
>
> Hi Jakub Kicinski:
>
> The issue here is found by reading code.
> I read the drivers/net/wireless code and found that many modules are
> not cleanup the debugfs.
> I sorted out the modules that were not cleaned up the debugfs:
> ./ti/wl18xx
> ./ti/wl12xx
> ./intel/iwlwifi
> ./intel/iwlwifi
> ./mediatek/mt76
> I am not sure whether this part is welcome to kernel so I submitted a patch.
> If you have any suggestions, welcome to put forward for discussion, thank you！

Jakub is saying that wiphy_unregister() recursively removes the debugfs
directories:

	/*
	 * First remove the hardware from everywhere, this makes
	 * it impossible to find from userspace.
	 */
	debugfs_remove_recursive(rdev->wiphy.debugfsdir);

So AFAICS there is no bug. But if you are testing this on a real
hardware and something is wrong, please provide more info.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

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Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[Kalle Valo]

z  <zhaojunkui2008@126.com> writes:

> At 2022-04-23 03:47:04, "Jakub Kicinski" <kubakici@wp.pl> wrote:
>>On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
>>> 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@126.com>
>>
>>Ah, missed that there was a v2. My point stands, wiphy debugfs dir
>>should do the cleanup.
>>
>>Do you encounter problems in practice or are you sending this patches
>>based on reading / static analysis of the code only.
>
> Hi Jakub Kicinski:
>
> The issue here is found by reading code.
> I read the drivers/net/wireless code and found that many modules are
> not cleanup the debugfs.
> I sorted out the modules that were not cleaned up the debugfs:
> ./ti/wl18xx
> ./ti/wl12xx
> ./intel/iwlwifi
> ./intel/iwlwifi
> ./mediatek/mt76
> I am not sure whether this part is welcome to kernel so I submitted a patch.
> If you have any suggestions, welcome to put forward for discussion, thank you！

Jakub is saying that wiphy_unregister() recursively removes the debugfs
directories:

	/*
	 * First remove the hardware from everywhere, this makes
	 * it impossible to find from userspace.
	 */
	debugfs_remove_recursive(rdev->wiphy.debugfsdir);

So AFAICS there is no bug. But if you are testing this on a real
hardware and something is wrong, please provide more info.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

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Re: [PATCH v2] mediatek/mt7601u: add debugfs exit function

[Kalle Valo]

z  <zhaojunkui2008@126.com> writes:

> At 2022-04-23 03:47:04, "Jakub Kicinski" <kubakici@wp.pl> wrote:
>>On Fri, 22 Apr 2022 01:08:54 -0700 Bernard Zhao wrote:
>>> 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@126.com>
>>
>>Ah, missed that there was a v2. My point stands, wiphy debugfs dir
>>should do the cleanup.
>>
>>Do you encounter problems in practice or are you sending this patches
>>based on reading / static analysis of the code only.
>
> Hi Jakub Kicinski:
>
> The issue here is found by reading code.
> I read the drivers/net/wireless code and found that many modules are
> not cleanup the debugfs.
> I sorted out the modules that were not cleaned up the debugfs:
> ./ti/wl18xx
> ./ti/wl12xx
> ./intel/iwlwifi
> ./intel/iwlwifi
> ./mediatek/mt76
> I am not sure whether this part is welcome to kernel so I submitted a patch.
> If you have any suggestions, welcome to put forward for discussion, thank you！

Jakub is saying that wiphy_unregister() recursively removes the debugfs
directories:

	/*
	 * First remove the hardware from everywhere, this makes
	 * it impossible to find from userspace.
	 */
	debugfs_remove_recursive(rdev->wiphy.debugfsdir);

So AFAICS there is no bug. But if you are testing this on a real
hardware and something is wrong, please provide more info.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches