[PATCH] rt2x00: no need to check return value of debugfs_create functions

[PATCH] rt2x00: 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.  The function can work or not, but the code logic should
never do something different based on this.

Because we don't need to save the individual debugfs files and
directories, remove the local storage of them and just remove the entire
debugfs directory in a single call, making things a lot simpler.

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.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>
---
 .../net/wireless/ralink/rt2x00/rt2x00debug.c  | 100 ++++--------------
 1 file changed, 23 insertions(+), 77 deletions(-)

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c b/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
index aac3aae7afaa..7103904de28a 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
@@ -64,25 +64,6 @@ struct rt2x00debug_intf {
 	 *     - crypto stats file
 	 */
 	struct dentry *driver_folder;
-	struct dentry *driver_entry;
-	struct dentry *chipset_entry;
-	struct dentry *dev_flags;
-	struct dentry *cap_flags;
-	struct dentry *register_folder;
-	struct dentry *csr_off_entry;
-	struct dentry *csr_val_entry;
-	struct dentry *eeprom_off_entry;
-	struct dentry *eeprom_val_entry;
-	struct dentry *bbp_off_entry;
-	struct dentry *bbp_val_entry;
-	struct dentry *rf_off_entry;
-	struct dentry *rf_val_entry;
-	struct dentry *rfcsr_off_entry;
-	struct dentry *rfcsr_val_entry;
-	struct dentry *queue_folder;
-	struct dentry *queue_frame_dump_entry;
-	struct dentry *queue_stats_entry;
-	struct dentry *crypto_stats_entry;
 
 	/*
 	 * The frame dump file only allows a single reader,
@@ -631,6 +612,8 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 {
 	const struct rt2x00debug *debug = rt2x00dev->ops->debugfs;
 	struct rt2x00debug_intf *intf;
+	struct dentry *queue_folder;
+	struct dentry *register_folder;
 
 	intf = kzalloc(sizeof(struct rt2x00debug_intf), GFP_KERNEL);
 	if (!intf) {
@@ -646,39 +629,28 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 	    debugfs_create_dir(intf->rt2x00dev->ops->name,
 			       rt2x00dev->hw->wiphy->debugfsdir);
 
-	intf->driver_entry =
-	    rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
+	rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
 
-	intf->chipset_entry =
-	    rt2x00debug_create_file_chipset("chipset",
-					    intf, &intf->chipset_blob);
+	rt2x00debug_create_file_chipset("chipset", intf, &intf->chipset_blob);
 
-	intf->dev_flags = debugfs_create_file("dev_flags", 0400,
-					      intf->driver_folder, intf,
-					      &rt2x00debug_fop_dev_flags);
+	debugfs_create_file("dev_flags", 0400, intf->driver_folder, intf,
+			    &rt2x00debug_fop_dev_flags);
 
-	intf->cap_flags = debugfs_create_file("cap_flags", 0400,
-					      intf->driver_folder, intf,
-					      &rt2x00debug_fop_cap_flags);
+	debugfs_create_file("cap_flags", 0400, intf->driver_folder, intf,
+			    &rt2x00debug_fop_cap_flags);
 
-	intf->register_folder =
-	    debugfs_create_dir("register", intf->driver_folder);
+	register_folder = debugfs_create_dir("register", intf->driver_folder);
 
 #define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)		\
 ({									\
 	if (debug->__name.read) {					\
-		(__intf)->__name##_off_entry =				\
-			debugfs_create_u32(__stringify(__name) "_offset", \
-					   0600,			\
-					   (__intf)->register_folder,	\
-					   &(__intf)->offset_##__name);	\
+		debugfs_create_u32(__stringify(__name) "_offset", 0600,	\
+				   register_folder,			\
+				   &(__intf)->offset_##__name);		\
 									\
-		(__intf)->__name##_val_entry =				\
-			debugfs_create_file(__stringify(__name) "_value", \
-					    0600,			\
-					    (__intf)->register_folder,	\
-					    (__intf),			\
-					    &rt2x00debug_fop_##__name); \
+		debugfs_create_file(__stringify(__name) "_value", 0600,	\
+				    register_folder, (__intf),		\
+				    &rt2x00debug_fop_##__name);		\
 	}								\
 })
 
@@ -690,26 +662,21 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 
 #undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY
 
-	intf->queue_folder =
-	    debugfs_create_dir("queue", intf->driver_folder);
+	queue_folder = debugfs_create_dir("queue", intf->driver_folder);
 
-	intf->queue_frame_dump_entry =
-		debugfs_create_file("dump", 0400, intf->queue_folder,
-				    intf, &rt2x00debug_fop_queue_dump);
+	debugfs_create_file("dump", 0400, queue_folder, intf,
+			    &rt2x00debug_fop_queue_dump);
 
 	skb_queue_head_init(&intf->frame_dump_skbqueue);
 	init_waitqueue_head(&intf->frame_dump_waitqueue);
 
-	intf->queue_stats_entry =
-		debugfs_create_file("queue", 0400, intf->queue_folder,
-				    intf, &rt2x00debug_fop_queue_stats);
+	debugfs_create_file("queue", 0400, queue_folder, intf,
+			    &rt2x00debug_fop_queue_stats);
 
 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 	if (rt2x00_has_cap_hw_crypto(rt2x00dev))
-		intf->crypto_stats_entry =
-			debugfs_create_file("crypto", 0444, intf->queue_folder,
-					    intf,
-					    &rt2x00debug_fop_crypto_stats);
+		debugfs_create_file("crypto", 0444, queue_folder, intf,
+				    &rt2x00debug_fop_crypto_stats);
 #endif
 
 	return;
@@ -724,28 +691,7 @@ void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
 
 	skb_queue_purge(&intf->frame_dump_skbqueue);
 
-#ifdef CONFIG_RT2X00_LIB_CRYPTO
-	debugfs_remove(intf->crypto_stats_entry);
-#endif
-	debugfs_remove(intf->queue_stats_entry);
-	debugfs_remove(intf->queue_frame_dump_entry);
-	debugfs_remove(intf->queue_folder);
-	debugfs_remove(intf->rfcsr_val_entry);
-	debugfs_remove(intf->rfcsr_off_entry);
-	debugfs_remove(intf->rf_val_entry);
-	debugfs_remove(intf->rf_off_entry);
-	debugfs_remove(intf->bbp_val_entry);
-	debugfs_remove(intf->bbp_off_entry);
-	debugfs_remove(intf->eeprom_val_entry);
-	debugfs_remove(intf->eeprom_off_entry);
-	debugfs_remove(intf->csr_val_entry);
-	debugfs_remove(intf->csr_off_entry);
-	debugfs_remove(intf->register_folder);
-	debugfs_remove(intf->dev_flags);
-	debugfs_remove(intf->cap_flags);
-	debugfs_remove(intf->chipset_entry);
-	debugfs_remove(intf->driver_entry);
-	debugfs_remove(intf->driver_folder);
+	debugfs_remove_recursive(intf->driver_folder);
 	kfree(intf->chipset_blob.data);
 	kfree(intf->driver_blob.data);
 	kfree(intf);
-- 
2.22.0

Re: [PATCH] rt2x00: no need to check return value of debugfs_create functions

[Stanislaw Gruszka]

On Wed, Jul 03, 2019 at 08:56:31AM +0200, Greg Kroah-Hartman wrote:
> 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 need to save the individual debugfs files and
> directories, remove the local storage of them and just remove the entire
> debugfs directory in a single call, making things a lot simpler.
> 
> Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> Cc: Helmut Schaa <helmut.schaa@googlemail.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>
> ---
>  .../net/wireless/ralink/rt2x00/rt2x00debug.c  | 100 ++++--------------
>  1 file changed, 23 insertions(+), 77 deletions(-)

This patch will not apply on wireless-drivers-next due to my recent
change which add new debugfs file:

commit e7f15d58dfe43f18199251f430d7713b0b8fad34
Author: Stanislaw Gruszka <sgruszka@redhat.com>
Date:   Thu May 2 11:07:00 2019 +0200

    rt2x00: add restart hw

Could you please rebase the patch ? (I can do this as well
if you want me to).

Stanislaw

Re: [PATCH] rt2x00: no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

On Wed, Jul 03, 2019 at 12:58:00PM +0200, Stanislaw Gruszka wrote:
> On Wed, Jul 03, 2019 at 08:56:31AM +0200, Greg Kroah-Hartman wrote:
> > 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 need to save the individual debugfs files and
> > directories, remove the local storage of them and just remove the entire
> > debugfs directory in a single call, making things a lot simpler.
> > 
> > Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> > Cc: Helmut Schaa <helmut.schaa@googlemail.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>
> > ---
> >  .../net/wireless/ralink/rt2x00/rt2x00debug.c  | 100 ++++--------------
> >  1 file changed, 23 insertions(+), 77 deletions(-)
> 
> This patch will not apply on wireless-drivers-next due to my recent
> change which add new debugfs file:
> 
> commit e7f15d58dfe43f18199251f430d7713b0b8fad34
> Author: Stanislaw Gruszka <sgruszka@redhat.com>
> Date:   Thu May 2 11:07:00 2019 +0200
> 
>     rt2x00: add restart hw
> 
> Could you please rebase the patch ? (I can do this as well
> if you want me to).

No problem, I can rebase and redo it, I'll go suck down the
wireless-drivers-next tree and resend it, thanks for leting me know.

greg k-h

[PATCH v2] rt2x00: 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.  The function can work or not, but the code logic should
never do something different based on this.

Because we don't need to save the individual debugfs files and
directories, remove the local storage of them and just remove the entire
debugfs directory in a single call, making things a lot simpler.

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.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>
---
v2: - rebase against wireless-drivers-next
    - clean up the debugfs "blob" creation logic a bit more, no need to
      care about that return value.

 .../net/wireless/ralink/rt2x00/rt2x00debug.c  | 136 +++++-------------
 1 file changed, 35 insertions(+), 101 deletions(-)

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c b/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
index ef5f51512212..4d4e3888ef20 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
@@ -65,26 +65,6 @@ struct rt2x00debug_intf {
 	 *     - crypto stats file
 	 */
 	struct dentry *driver_folder;
-	struct dentry *driver_entry;
-	struct dentry *chipset_entry;
-	struct dentry *dev_flags;
-	struct dentry *cap_flags;
-	struct dentry *restart_hw;
-	struct dentry *register_folder;
-	struct dentry *csr_off_entry;
-	struct dentry *csr_val_entry;
-	struct dentry *eeprom_off_entry;
-	struct dentry *eeprom_val_entry;
-	struct dentry *bbp_off_entry;
-	struct dentry *bbp_val_entry;
-	struct dentry *rf_off_entry;
-	struct dentry *rf_val_entry;
-	struct dentry *rfcsr_off_entry;
-	struct dentry *rfcsr_val_entry;
-	struct dentry *queue_folder;
-	struct dentry *queue_frame_dump_entry;
-	struct dentry *queue_stats_entry;
-	struct dentry *crypto_stats_entry;
 
 	/*
 	 * The frame dump file only allows a single reader,
@@ -596,39 +576,34 @@ static const struct file_operations rt2x00debug_restart_hw = {
 	.llseek = generic_file_llseek,
 };
 
-static struct dentry *rt2x00debug_create_file_driver(const char *name,
-						     struct rt2x00debug_intf
-						     *intf,
-						     struct debugfs_blob_wrapper
-						     *blob)
+static void rt2x00debug_create_file_driver(const char *name,
+					   struct rt2x00debug_intf *intf,
+					   struct debugfs_blob_wrapper *blob)
 {
 	char *data;
 
 	data = kzalloc(3 * MAX_LINE_LENGTH, GFP_KERNEL);
 	if (!data)
-		return NULL;
+		return;
 
 	blob->data = data;
 	data += sprintf(data, "driver:\t%s\n", intf->rt2x00dev->ops->name);
 	data += sprintf(data, "version:\t%s\n", DRV_VERSION);
 	blob->size = strlen(blob->data);
 
-	return debugfs_create_blob(name, 0400, intf->driver_folder, blob);
+	debugfs_create_blob(name, 0400, intf->driver_folder, blob);
 }
 
-static struct dentry *rt2x00debug_create_file_chipset(const char *name,
-						      struct rt2x00debug_intf
-						      *intf,
-						      struct
-						      debugfs_blob_wrapper
-						      *blob)
+static void rt2x00debug_create_file_chipset(const char *name,
+					    struct rt2x00debug_intf *intf,
+					    struct debugfs_blob_wrapper *blob)
 {
 	const struct rt2x00debug *debug = intf->debug;
 	char *data;
 
 	data = kzalloc(9 * MAX_LINE_LENGTH, GFP_KERNEL);
 	if (!data)
-		return NULL;
+		return;
 
 	blob->data = data;
 	data += sprintf(data, "rt chip:\t%04x\n", intf->rt2x00dev->chip.rt);
@@ -654,13 +629,15 @@ static struct dentry *rt2x00debug_create_file_chipset(const char *name,
 
 	blob->size = strlen(blob->data);
 
-	return debugfs_create_blob(name, 0400, intf->driver_folder, blob);
+	debugfs_create_blob(name, 0400, intf->driver_folder, blob);
 }
 
 void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 {
 	const struct rt2x00debug *debug = rt2x00dev->ops->debugfs;
 	struct rt2x00debug_intf *intf;
+	struct dentry *queue_folder;
+	struct dentry *register_folder;
 
 	intf = kzalloc(sizeof(struct rt2x00debug_intf), GFP_KERNEL);
 	if (!intf) {
@@ -676,43 +653,27 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 	    debugfs_create_dir(intf->rt2x00dev->ops->name,
 			       rt2x00dev->hw->wiphy->debugfsdir);
 
-	intf->driver_entry =
-	    rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
+	rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
+	rt2x00debug_create_file_chipset("chipset", intf, &intf->chipset_blob);
+	debugfs_create_file("dev_flags", 0400, intf->driver_folder, intf,
+			    &rt2x00debug_fop_dev_flags);
+	debugfs_create_file("cap_flags", 0400, intf->driver_folder, intf,
+			    &rt2x00debug_fop_cap_flags);
+	debugfs_create_file("restart_hw", 0200, intf->driver_folder, intf,
+			    &rt2x00debug_restart_hw);
 
-	intf->chipset_entry =
-	    rt2x00debug_create_file_chipset("chipset",
-					    intf, &intf->chipset_blob);
-
-	intf->dev_flags = debugfs_create_file("dev_flags", 0400,
-					      intf->driver_folder, intf,
-					      &rt2x00debug_fop_dev_flags);
-
-	intf->cap_flags = debugfs_create_file("cap_flags", 0400,
-					      intf->driver_folder, intf,
-					      &rt2x00debug_fop_cap_flags);
-
-	intf->restart_hw = debugfs_create_file("restart_hw", 0200,
-					       intf->driver_folder, intf,
-					       &rt2x00debug_restart_hw);
-
-	intf->register_folder =
-	    debugfs_create_dir("register", intf->driver_folder);
+	register_folder = debugfs_create_dir("register", intf->driver_folder);
 
 #define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)		\
 ({									\
 	if (debug->__name.read) {					\
-		(__intf)->__name##_off_entry =				\
-			debugfs_create_u32(__stringify(__name) "_offset", \
-					   0600,			\
-					   (__intf)->register_folder,	\
-					   &(__intf)->offset_##__name);	\
+		debugfs_create_u32(__stringify(__name) "_offset", 0600,	\
+				   register_folder,			\
+				   &(__intf)->offset_##__name);		\
 									\
-		(__intf)->__name##_val_entry =				\
-			debugfs_create_file(__stringify(__name) "_value", \
-					    0600,			\
-					    (__intf)->register_folder,	\
-					    (__intf),			\
-					    &rt2x00debug_fop_##__name); \
+		debugfs_create_file(__stringify(__name) "_value", 0600,	\
+				    register_folder, (__intf),		\
+				    &rt2x00debug_fop_##__name);		\
 	}								\
 })
 
@@ -724,26 +685,21 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 
 #undef RT2X00DEBUGFS_CREATE_REGISTER_ENTRY
 
-	intf->queue_folder =
-	    debugfs_create_dir("queue", intf->driver_folder);
+	queue_folder = debugfs_create_dir("queue", intf->driver_folder);
 
-	intf->queue_frame_dump_entry =
-		debugfs_create_file("dump", 0400, intf->queue_folder,
-				    intf, &rt2x00debug_fop_queue_dump);
+	debugfs_create_file("dump", 0400, queue_folder, intf,
+			    &rt2x00debug_fop_queue_dump);
 
 	skb_queue_head_init(&intf->frame_dump_skbqueue);
 	init_waitqueue_head(&intf->frame_dump_waitqueue);
 
-	intf->queue_stats_entry =
-		debugfs_create_file("queue", 0400, intf->queue_folder,
-				    intf, &rt2x00debug_fop_queue_stats);
+	debugfs_create_file("queue", 0400, queue_folder, intf,
+			    &rt2x00debug_fop_queue_stats);
 
 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 	if (rt2x00_has_cap_hw_crypto(rt2x00dev))
-		intf->crypto_stats_entry =
-			debugfs_create_file("crypto", 0444, intf->queue_folder,
-					    intf,
-					    &rt2x00debug_fop_crypto_stats);
+		debugfs_create_file("crypto", 0444, queue_folder, intf,
+				    &rt2x00debug_fop_crypto_stats);
 #endif
 
 	return;
@@ -758,29 +714,7 @@ void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
 
 	skb_queue_purge(&intf->frame_dump_skbqueue);
 
-#ifdef CONFIG_RT2X00_LIB_CRYPTO
-	debugfs_remove(intf->crypto_stats_entry);
-#endif
-	debugfs_remove(intf->queue_stats_entry);
-	debugfs_remove(intf->queue_frame_dump_entry);
-	debugfs_remove(intf->queue_folder);
-	debugfs_remove(intf->rfcsr_val_entry);
-	debugfs_remove(intf->rfcsr_off_entry);
-	debugfs_remove(intf->rf_val_entry);
-	debugfs_remove(intf->rf_off_entry);
-	debugfs_remove(intf->bbp_val_entry);
-	debugfs_remove(intf->bbp_off_entry);
-	debugfs_remove(intf->eeprom_val_entry);
-	debugfs_remove(intf->eeprom_off_entry);
-	debugfs_remove(intf->csr_val_entry);
-	debugfs_remove(intf->csr_off_entry);
-	debugfs_remove(intf->register_folder);
-	debugfs_remove(intf->dev_flags);
-	debugfs_remove(intf->restart_hw);
-	debugfs_remove(intf->cap_flags);
-	debugfs_remove(intf->chipset_entry);
-	debugfs_remove(intf->driver_entry);
-	debugfs_remove(intf->driver_folder);
+	debugfs_remove_recursive(intf->driver_folder);
 	kfree(intf->chipset_blob.data);
 	kfree(intf->driver_blob.data);
 	kfree(intf);
-- 
2.22.0

Re: [PATCH v2] rt2x00: no need to check return value of debugfs_create functions

[Stanislaw Gruszka]

On Wed, Jul 03, 2019 at 01:39:56PM +0200, Greg Kroah-Hartman wrote:
> 
> 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 need to save the individual debugfs files and
> directories, remove the local storage of them and just remove the entire
> debugfs directory in a single call, making things a lot simpler.
> 
> Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> Cc: Helmut Schaa <helmut.schaa@googlemail.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>

Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>

Re: [PATCH v2] rt2x00: 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.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Because we don't need to save the individual debugfs files and
> directories, remove the local storage of them and just remove the entire
> debugfs directory in a single call, making things a lot simpler.
> 
> Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> Cc: Helmut Schaa <helmut.schaa@googlemail.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>
> Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>

Patch applied to wireless-drivers-next.git, thanks.

1dc244064c47 rt2x00: no need to check return value of debugfs_create functions

-- 
https://patchwork.kernel.org/patch/11029367/

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

[PATCH] rt2x00: 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.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Helmut Schaa <helmut.schaa@googlemail.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: linux-wireless@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 .../net/wireless/ralink/rt2x00/rt2x00debug.c  | 27 -------------------
 1 file changed, 27 deletions(-)

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c b/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
index 61ba573e8bf1..05a2e8da412c 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00debug.c
@@ -656,36 +656,24 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 	intf->driver_folder =
 	    debugfs_create_dir(intf->rt2x00dev->ops->name,
 			       rt2x00dev->hw->wiphy->debugfsdir);
-	if (IS_ERR(intf->driver_folder) || !intf->driver_folder)
-		goto exit;
 
 	intf->driver_entry =
 	    rt2x00debug_create_file_driver("driver", intf, &intf->driver_blob);
-	if (IS_ERR(intf->driver_entry) || !intf->driver_entry)
-		goto exit;
 
 	intf->chipset_entry =
 	    rt2x00debug_create_file_chipset("chipset",
 					    intf, &intf->chipset_blob);
-	if (IS_ERR(intf->chipset_entry) || !intf->chipset_entry)
-		goto exit;
 
 	intf->dev_flags = debugfs_create_file("dev_flags", 0400,
 					      intf->driver_folder, intf,
 					      &rt2x00debug_fop_dev_flags);
-	if (IS_ERR(intf->dev_flags) || !intf->dev_flags)
-		goto exit;
 
 	intf->cap_flags = debugfs_create_file("cap_flags", 0400,
 					      intf->driver_folder, intf,
 					      &rt2x00debug_fop_cap_flags);
-	if (IS_ERR(intf->cap_flags) || !intf->cap_flags)
-		goto exit;
 
 	intf->register_folder =
 	    debugfs_create_dir("register", intf->driver_folder);
-	if (IS_ERR(intf->register_folder) || !intf->register_folder)
-		goto exit;
 
 #define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)		\
 ({									\
@@ -695,9 +683,6 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 					   0600,			\
 					   (__intf)->register_folder,	\
 					   &(__intf)->offset_##__name);	\
-		if (IS_ERR((__intf)->__name##_off_entry) ||		\
-		    !(__intf)->__name##_off_entry)			\
-			goto exit;					\
 									\
 		(__intf)->__name##_val_entry =				\
 			debugfs_create_file(__stringify(__name) "_value", \
@@ -705,9 +690,6 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 					    (__intf)->register_folder,	\
 					    (__intf),			\
 					    &rt2x00debug_fop_##__name); \
-		if (IS_ERR((__intf)->__name##_val_entry) ||		\
-		    !(__intf)->__name##_val_entry)			\
-			goto exit;					\
 	}								\
 })
 
@@ -721,15 +703,10 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 
 	intf->queue_folder =
 	    debugfs_create_dir("queue", intf->driver_folder);
-	if (IS_ERR(intf->queue_folder) || !intf->queue_folder)
-		goto exit;
 
 	intf->queue_frame_dump_entry =
 		debugfs_create_file("dump", 0400, intf->queue_folder,
 				    intf, &rt2x00debug_fop_queue_dump);
-	if (IS_ERR(intf->queue_frame_dump_entry)
-		|| !intf->queue_frame_dump_entry)
-		goto exit;
 
 	skb_queue_head_init(&intf->frame_dump_skbqueue);
 	init_waitqueue_head(&intf->frame_dump_waitqueue);
@@ -747,10 +724,6 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 #endif
 
 	return;
-
-exit:
-	rt2x00debug_deregister(rt2x00dev);
-	rt2x00_err(rt2x00dev, "Failed to register debug handler\n");
 }
 
 void rt2x00debug_deregister(struct rt2x00_dev *rt2x00dev)
-- 
2.20.1

Re: [PATCH] rt2x00: no need to check return value of debugfs_create functions

[Stanislaw Gruszka]

On Tue, Jan 22, 2019 at 04:21:34PM +0100, Greg Kroah-Hartman wrote:
> 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.
> 
> Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> Cc: Helmut Schaa <helmut.schaa@googlemail.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: linux-wireless@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>

Re: [PATCH] rt2x00: 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.  The function can work or not, but the code logic should
> never do something different based on this.
> 
> Cc: Stanislaw Gruszka <sgruszka@redhat.com>
> Cc: Helmut Schaa <helmut.schaa@googlemail.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: linux-wireless@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Acked-by: Stanislaw Gruszka <sgruszka@redhat.com>

Patch applied to wireless-drivers-next.git, thanks.

2587791d5758 rt2x00: no need to check return value of debugfs_create functions

-- 
https://patchwork.kernel.org/patch/10775749/

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