[PATCH 1/5] iwlegacy: 3945: no need to check return value of debugfs_create functions

[PATCH 1/5] iwlegacy: 3945: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

When calling debugfs functions, there is no need to ever check the
return value.  This driver was saving the debugfs file away to be
removed at a later time.  However, the 80211 core would delete the whole
directory that the debugfs files are created in, after it asks the
driver to do the deletion, so just rely on the 80211 core to do all of
the cleanup for us, making us not need to keep a pointer to the dentries
around at all.

This cleans up the structure of the driver data a bit and makes the code
a tiny bit smaller.

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/intel/iwlegacy/3945-rs.c | 14 ++------------
 drivers/net/wireless/intel/iwlegacy/3945.h    |  3 ---
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlegacy/3945-rs.c b/drivers/net/wireless/intel/iwlegacy/3945-rs.c
index a697edd46e7f..1d810cae6091 100644
--- a/drivers/net/wireless/intel/iwlegacy/3945-rs.c
+++ b/drivers/net/wireless/intel/iwlegacy/3945-rs.c
@@ -861,17 +861,8 @@ il3945_add_debugfs(void *il, void *il_sta, struct dentry *dir)
 {
 	struct il3945_rs_sta *lq_sta = il_sta;
 
-	lq_sta->rs_sta_dbgfs_stats_table_file =
-	    debugfs_create_file("rate_stats_table", 0600, dir, lq_sta,
-				&rs_sta_dbgfs_stats_table_ops);
-
-}
-
-static void
-il3945_remove_debugfs(void *il, void *il_sta)
-{
-	struct il3945_rs_sta *lq_sta = il_sta;
-	debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
+	debugfs_create_file("rate_stats_table", 0600, dir, lq_sta,
+			    &rs_sta_dbgfs_stats_table_ops);
 }
 #endif
 
@@ -898,7 +889,6 @@ static const struct rate_control_ops rs_ops = {
 	.free_sta = il3945_rs_free_sta,
 #ifdef CONFIG_MAC80211_DEBUGFS
 	.add_sta_debugfs = il3945_add_debugfs,
-	.remove_sta_debugfs = il3945_remove_debugfs,
 #endif
 
 };
diff --git a/drivers/net/wireless/intel/iwlegacy/3945.h b/drivers/net/wireless/intel/iwlegacy/3945.h
index 00030d43a194..1aeb4b238fcf 100644
--- a/drivers/net/wireless/intel/iwlegacy/3945.h
+++ b/drivers/net/wireless/intel/iwlegacy/3945.h
@@ -87,9 +87,6 @@ struct il3945_rs_sta {
 	u8 start_rate;
 	struct timer_list rate_scale_flush;
 	struct il3945_rate_scale_data win[RATE_COUNT_3945];
-#ifdef CONFIG_MAC80211_DEBUGFS
-	struct dentry *rs_sta_dbgfs_stats_table_file;
-#endif
 
 	/* used to be in sta_info */
 	int last_txrate_idx;
-- 
2.22.0

[PATCH 2/5] iwlegacy: 4965: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

When calling debugfs functions, there is no need to ever check the
return value.  This driver was saving the debugfs file away to be
removed at a later time.  However, the 80211 core would delete the whole
directory that the debugfs files are created in, after it asks the
driver to do the deletion, so just rely on the 80211 core to do all of
the cleanup for us, making us not need to keep a pointer to the dentries
around at all.

This cleans up the structure of the driver data a bit and makes the code
a tiny bit smaller.

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/intel/iwlegacy/4965-rs.c | 31 +++++--------------
 drivers/net/wireless/intel/iwlegacy/common.h  |  4 ---
 2 files changed, 8 insertions(+), 27 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlegacy/4965-rs.c b/drivers/net/wireless/intel/iwlegacy/4965-rs.c
index 54ff83829afb..f640709d9862 100644
--- a/drivers/net/wireless/intel/iwlegacy/4965-rs.c
+++ b/drivers/net/wireless/intel/iwlegacy/4965-rs.c
@@ -2767,29 +2767,15 @@ static void
 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
 {
 	struct il_lq_sta *lq_sta = il_sta;
-	lq_sta->rs_sta_dbgfs_scale_table_file =
-	    debugfs_create_file("rate_scale_table", 0600, dir,
-				lq_sta, &rs_sta_dbgfs_scale_table_ops);
-	lq_sta->rs_sta_dbgfs_stats_table_file =
-	    debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
-				&rs_sta_dbgfs_stats_table_ops);
-	lq_sta->rs_sta_dbgfs_rate_scale_data_file =
-	    debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
-				&rs_sta_dbgfs_rate_scale_data_ops);
-	lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
-	    debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
-			      &lq_sta->tx_agg_tid_en);
 
-}
-
-static void
-il4965_rs_remove_debugfs(void *il, void *il_sta)
-{
-	struct il_lq_sta *lq_sta = il_sta;
-	debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
-	debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
-	debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
-	debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
+	debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
+			    &rs_sta_dbgfs_scale_table_ops);
+	debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
+			    &rs_sta_dbgfs_stats_table_ops);
+	debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
+			    &rs_sta_dbgfs_rate_scale_data_ops);
+	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
+			  &lq_sta->tx_agg_tid_en);
 }
 #endif
 
@@ -2816,7 +2802,6 @@ static const struct rate_control_ops rs_4965_ops = {
 	.free_sta = il4965_rs_free_sta,
 #ifdef CONFIG_MAC80211_DEBUGFS
 	.add_sta_debugfs = il4965_rs_add_debugfs,
-	.remove_sta_debugfs = il4965_rs_remove_debugfs,
 #endif
 };
 
diff --git a/drivers/net/wireless/intel/iwlegacy/common.h b/drivers/net/wireless/intel/iwlegacy/common.h
index 986646af8dfd..3c6f41763dde 100644
--- a/drivers/net/wireless/intel/iwlegacy/common.h
+++ b/drivers/net/wireless/intel/iwlegacy/common.h
@@ -2822,10 +2822,6 @@ struct il_lq_sta {
 	struct il_traffic_load load[TID_MAX_LOAD_COUNT];
 	u8 tx_agg_tid_en;
 #ifdef CONFIG_MAC80211_DEBUGFS
-	struct dentry *rs_sta_dbgfs_scale_table_file;
-	struct dentry *rs_sta_dbgfs_stats_table_file;
-	struct dentry *rs_sta_dbgfs_rate_scale_data_file;
-	struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 	u32 dbg_fixed_rate;
 #endif
 	struct il_priv *drv;
-- 
2.22.0

[PATCH 3/5] iwlwifi: dvm: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

When calling debugfs functions, there is no need to ever check the
return value.  This driver was saving the debugfs file away to be
removed at a later time.  However, the 80211 core would delete the whole
directory that the debugfs files are created in, after it asks the
driver to do the deletion, so just rely on the 80211 core to do all of
the cleanup for us, making us not need to keep a pointer to the dentries
around at all.

This cleans up the structure of the driver data a bit and makes the code
a tiny bit smaller.

Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Cc: Luca Coelho <luciano.coelho@intel.com>
Cc: Intel Linux Wireless <linuxwifi@intel.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/intel/iwlwifi/dvm/rs.c | 29 ++++++---------------
 drivers/net/wireless/intel/iwlwifi/dvm/rs.h |  4 ---
 2 files changed, 8 insertions(+), 25 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
index ef4b9de256f7..91e571c99f81 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/rs.c
@@ -3271,28 +3271,16 @@ static void rs_add_debugfs(void *priv, void *priv_sta,
 					struct dentry *dir)
 {
 	struct iwl_lq_sta *lq_sta = priv_sta;
-	lq_sta->rs_sta_dbgfs_scale_table_file =
-		debugfs_create_file("rate_scale_table", 0600, dir,
-				    lq_sta, &rs_sta_dbgfs_scale_table_ops);
-	lq_sta->rs_sta_dbgfs_stats_table_file =
-		debugfs_create_file("rate_stats_table", 0400, dir,
-				    lq_sta, &rs_sta_dbgfs_stats_table_ops);
-	lq_sta->rs_sta_dbgfs_rate_scale_data_file =
-		debugfs_create_file("rate_scale_data", 0400, dir,
-				    lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
-	lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
-		debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
-				  &lq_sta->tx_agg_tid_en);
 
-}
+	debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
+			    &rs_sta_dbgfs_scale_table_ops);
+	debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
+			    &rs_sta_dbgfs_stats_table_ops);
+	debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
+			    &rs_sta_dbgfs_rate_scale_data_ops);
+	debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
+			  &lq_sta->tx_agg_tid_en);
 
-static void rs_remove_debugfs(void *priv, void *priv_sta)
-{
-	struct iwl_lq_sta *lq_sta = priv_sta;
-	debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
-	debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
-	debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
-	debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
 }
 #endif
 
@@ -3318,7 +3306,6 @@ static const struct rate_control_ops rs_ops = {
 	.free_sta = rs_free_sta,
 #ifdef CONFIG_MAC80211_DEBUGFS
 	.add_sta_debugfs = rs_add_debugfs,
-	.remove_sta_debugfs = rs_remove_debugfs,
 #endif
 };
 
diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/rs.h b/drivers/net/wireless/intel/iwlwifi/dvm/rs.h
index b2df3a8cc464..92836a815234 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/rs.h
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/rs.h
@@ -367,10 +367,6 @@ struct iwl_lq_sta {
 	struct iwl_traffic_load load[IWL_MAX_TID_COUNT];
 	u8 tx_agg_tid_en;
 #ifdef CONFIG_MAC80211_DEBUGFS
-	struct dentry *rs_sta_dbgfs_scale_table_file;
-	struct dentry *rs_sta_dbgfs_stats_table_file;
-	struct dentry *rs_sta_dbgfs_rate_scale_data_file;
-	struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
 	u32 dbg_fixed_rate;
 #endif
 	struct iwl_priv *drv;
-- 
2.22.0

Re: [PATCH 3/5] iwlwifi: dvm: no need to check return value of debugfs_create functions

[Luciano Coelho]

On Wed, 2019-06-12 at 16:26 +0200, Greg Kroah-Hartman wrote:
> When calling debugfs functions, there is no need to ever check the
> return value.  This driver was saving the debugfs file away to be
> removed at a later time.  However, the 80211 core would delete the whole
> directory that the debugfs files are created in, after it asks the
> driver to do the deletion, so just rely on the 80211 core to do all of
> the cleanup for us, making us not need to keep a pointer to the dentries
> around at all.
> 
> This cleans up the structure of the driver data a bit and makes the code
> a tiny bit smaller.
> 
> Cc: Johannes Berg <johannes.berg@intel.com>
> Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
> Cc: Luca Coelho <luciano.coelho@intel.com>
> Cc: Intel Linux Wireless <linuxwifi@intel.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: linux-wireless@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---

Thanks, Greg! I applied this to our internal tree and it will reach the
mainline following our normal upstreaming process.

--
Cheers,
Luca.

[PATCH 4/5] iwlwifi: mvm: remove unused .remove_sta_debugfs callback

[Greg Kroah-Hartman]

The .remove_sta_debugfs callback was not doing anything in this driver,
so remove it as it is not needed.

Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Cc: Luca Coelho <luciano.coelho@intel.com>
Cc: Intel Linux Wireless <linuxwifi@intel.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Sara Sharon <sara.sharon@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Erel Geron <erelx.geron@intel.com>
Cc: Avraham Stern <avraham.stern@intel.com>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/rs.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index c182821ab22b..15c1f825b749 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -4108,10 +4108,6 @@ static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
 
 	MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
 }
-
-void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
-{
-}
 #endif
 
 /*
@@ -4139,7 +4135,6 @@ static const struct rate_control_ops rs_mvm_ops_drv = {
 	.rate_update = rs_drv_rate_update,
 #ifdef CONFIG_MAC80211_DEBUGFS
 	.add_sta_debugfs = rs_drv_add_sta_debugfs,
-	.remove_sta_debugfs = rs_remove_sta_debugfs,
 #endif
 	.capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
 };
-- 
2.22.0

Re: [PATCH 4/5] iwlwifi: mvm: remove unused .remove_sta_debugfs callback

[Luciano Coelho]

On Wed, 2019-06-12 at 16:26 +0200, Greg Kroah-Hartman wrote:
> The .remove_sta_debugfs callback was not doing anything in this driver,
> so remove it as it is not needed.
> 
> Cc: Johannes Berg <johannes.berg@intel.com>
> Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
> Cc: Luca Coelho <luciano.coelho@intel.com>
> Cc: Intel Linux Wireless <linuxwifi@intel.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Sara Sharon <sara.sharon@intel.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: Erel Geron <erelx.geron@intel.com>
> Cc: Avraham Stern <avraham.stern@intel.com>
> Cc: linux-wireless@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---

Thanks, Greg! I applied this to our internal tree and it will reach the
mainline following our normal upstreaming process.

--
Cheers,
Luca.

[PATCH 5/5] mac80211: remove unused and unneeded remove_sta_debugfs callback

[Greg Kroah-Hartman]

The remove_sta_debugfs callback in struct rate_control_ops is no longer
used by any driver, as there is no need for it (the debugfs directory is
already removed recursivly by the mac80211 core.)  Because no one needs
it, just remove it to keep anyone else from accidentally using it in the
future.

Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/net/mac80211.h  | 1 -
 net/mac80211/rate.h     | 9 ---------
 net/mac80211/sta_info.c | 1 -
 3 files changed, 11 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 72080d9d617e..f42c61422fdf 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -5939,7 +5939,6 @@ struct rate_control_ops {
 
 	void (*add_sta_debugfs)(void *priv, void *priv_sta,
 				struct dentry *dir);
-	void (*remove_sta_debugfs)(void *priv, void *priv_sta);
 
 	u32 (*get_expected_throughput)(void *priv_sta);
 };
diff --git a/net/mac80211/rate.h b/net/mac80211/rate.h
index d59198191a79..a94ce3804962 100644
--- a/net/mac80211/rate.h
+++ b/net/mac80211/rate.h
@@ -63,15 +63,6 @@ static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
 #endif
 }
 
-static inline void rate_control_remove_sta_debugfs(struct sta_info *sta)
-{
-#ifdef CONFIG_MAC80211_DEBUGFS
-	struct rate_control_ref *ref = sta->rate_ctrl;
-	if (ref && ref->ops->remove_sta_debugfs)
-		ref->ops->remove_sta_debugfs(ref->priv, sta->rate_ctrl_priv);
-#endif
-}
-
 void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata);
 
 /* Get a reference to the rate control algorithm. If `name' is NULL, get the
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index a4932ee3595c..d2933b9f8197 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1027,7 +1027,6 @@ static void __sta_info_destroy_part2(struct sta_info *sta)
 	cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
 	kfree(sinfo);
 
-	rate_control_remove_sta_debugfs(sta);
 	ieee80211_sta_debugfs_remove(sta);
 
 	cleanup_single_sta(sta);
-- 
2.22.0

Re: [PATCH 1/5] iwlegacy: 3945: no need to check return value of debugfs_create functions

[Kalle Valo]

Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:

> When calling debugfs functions, there is no need to ever check the
> return value.  This driver was saving the debugfs file away to be
> removed at a later time.  However, the 80211 core would delete the whole
> directory that the debugfs files are created in, after it asks the
> driver to do the deletion, so just rely on the 80211 core to do all of
> the cleanup for us, making us not need to keep a pointer to the dentries
> around at all.
> 
> This cleans up the structure of the driver data a bit and makes the code
> a tiny bit smaller.
> 
> Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: linux-wireless@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 patches applied to wireless-drivers-next.git, thanks.

f503c7695343 iwlegacy: 3945: no need to check return value of debugfs_create functions
ffb92649f4d9 iwlegacy: 4965: no need to check return value of debugfs_create functions

-- 
https://patchwork.kernel.org/patch/10990125/

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