brcm80211: no need to check return value of debugfs_create functions
diff mbox series

Message ID 20190122152151.16139-32-gregkh@linuxfoundation.org
State Accepted
Commit 9ae49980bdca37052ffadc10d6b63d6f98cdaae0
Delegated to: Kalle Valo
Headers show
Series
  • brcm80211: no need to check return value of debugfs_create functions
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Commit Message

Greg Kroah-Hartman Jan. 22, 2019, 3:21 p.m. UTC
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: Arend van Spriel <arend.vanspriel@broadcom.com>
Cc: Franky Lin <franky.lin@broadcom.com>
Cc: Hante Meuleman <hante.meuleman@broadcom.com>
Cc: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
Cc: Wright Feng <wright.feng@cypress.com>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: linux-wireless@vger.kernel.org
Cc: brcm80211-dev-list.pdl@broadcom.com
Cc: brcm80211-dev-list@cypress.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 .../broadcom/brcm80211/brcmsmac/debug.c       | 26 +++----------------
 .../broadcom/brcm80211/brcmsmac/debug.h       |  2 +-
 2 files changed, 5 insertions(+), 23 deletions(-)

Comments

Arend Van Spriel Jan. 22, 2019, 8:07 p.m. UTC | #1
The prefix should be 'brcmsmac'.

On 1/22/2019 4:21 PM, 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.

I could argue that if above is true it would be better to make the 
debugfs function return void, but I won't ;-p

In start_creating() the parent dentry is indeed checked for IS_ERR() so...

Acked-by: Arend van Spriel

> Cc: Arend van Spriel <arend.vanspriel@broadcom.com>
> Cc: Franky Lin <franky.lin@broadcom.com>
> Cc: Hante Meuleman <hante.meuleman@broadcom.com>
> Cc: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
> Cc: Wright Feng <wright.feng@cypress.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: linux-wireless@vger.kernel.org
> Cc: brcm80211-dev-list.pdl@broadcom.com
> Cc: brcm80211-dev-list@cypress.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>   .../broadcom/brcm80211/brcmsmac/debug.c       | 26 +++----------------
>   .../broadcom/brcm80211/brcmsmac/debug.h       |  2 +-
>   2 files changed, 5 insertions(+), 23 deletions(-)
Greg Kroah-Hartman Jan. 22, 2019, 8:43 p.m. UTC | #2
On Tue, Jan 22, 2019 at 09:07:48PM +0100, Arend Van Spriel wrote:
> The prefix should be 'brcmsmac'.
> 
> On 1/22/2019 4:21 PM, 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.
> 
> I could argue that if above is true it would be better to make the debugfs
> function return void, but I won't ;-p

I would really want to do that, but sometimes you need that return value
to pass to other debugfs functions :(

> In start_creating() the parent dentry is indeed checked for IS_ERR() so...
> 
> Acked-by: Arend van Spriel

thanks for the review!

greg k-h
Kalle Valo Jan. 23, 2019, 5:11 a.m. UTC | #3
Arend Van Spriel <arend.vanspriel@broadcom.com> writes:

> The prefix should be 'brcmsmac'.

I can fix that during commit.
Kalle Valo Feb. 1, 2019, 12:38 p.m. UTC | #4
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: Arend van Spriel <arend.vanspriel@broadcom.com>
> Cc: Franky Lin <franky.lin@broadcom.com>
> Cc: Hante Meuleman <hante.meuleman@broadcom.com>
> Cc: Chi-Hsien Lin <chi-hsien.lin@cypress.com>
> Cc: Wright Feng <wright.feng@cypress.com>
> Cc: Kalle Valo <kvalo@codeaurora.org>
> Cc: linux-wireless@vger.kernel.org
> Cc: brcm80211-dev-list.pdl@broadcom.com
> Cc: brcm80211-dev-list@cypress.com
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Acked-by: Arend van Spriel

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

9ae49980bdca brcmsmac: no need to check return value of debugfs_create functions

Patch
diff mbox series

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.c
index 3bd54f125776..6d776ef6ff54 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.c
@@ -37,27 +37,18 @@  static struct dentry *root_folder;
 void brcms_debugfs_init(void)
 {
 	root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
-	if (IS_ERR(root_folder))
-		root_folder = NULL;
 }
 
 void brcms_debugfs_exit(void)
 {
-	if (!root_folder)
-		return;
-
 	debugfs_remove_recursive(root_folder);
 	root_folder = NULL;
 }
 
-int brcms_debugfs_attach(struct brcms_pub *drvr)
+void brcms_debugfs_attach(struct brcms_pub *drvr)
 {
-	if (!root_folder)
-		return -ENODEV;
-
 	drvr->dbgfs_dir = debugfs_create_dir(
 		 dev_name(&drvr->wlc->hw->d11core->dev), root_folder);
-	return PTR_ERR_OR_ZERO(drvr->dbgfs_dir);
 }
 
 void brcms_debugfs_detach(struct brcms_pub *drvr)
@@ -195,7 +186,7 @@  static const struct file_operations brcms_debugfs_def_ops = {
 	.llseek = seq_lseek
 };
 
-static int
+static void
 brcms_debugfs_add_entry(struct brcms_pub *drvr, const char *fn,
 			int (*read_fn)(struct seq_file *seq, void *data))
 {
@@ -203,27 +194,18 @@  brcms_debugfs_add_entry(struct brcms_pub *drvr, const char *fn,
 	struct dentry *dentry =  drvr->dbgfs_dir;
 	struct brcms_debugfs_entry *entry;
 
-	if (IS_ERR_OR_NULL(dentry))
-		return -ENOENT;
-
 	entry = devm_kzalloc(dev, sizeof(*entry), GFP_KERNEL);
 	if (!entry)
-		return -ENOMEM;
+		return;
 
 	entry->read = read_fn;
 	entry->drvr = drvr;
 
-	dentry = debugfs_create_file(fn, 0444, dentry, entry,
-				     &brcms_debugfs_def_ops);
-
-	return PTR_ERR_OR_ZERO(dentry);
+	debugfs_create_file(fn, 0444, dentry, entry, &brcms_debugfs_def_ops);
 }
 
 void brcms_debugfs_create_files(struct brcms_pub *drvr)
 {
-	if (IS_ERR_OR_NULL(drvr->dbgfs_dir))
-		return;
-
 	brcms_debugfs_add_entry(drvr, "hardware", brcms_debugfs_hardware_read);
 	brcms_debugfs_add_entry(drvr, "macstat", brcms_debugfs_macstat_read);
 }
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.h b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.h
index 822781cf15d4..56898e6d789d 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.h
@@ -68,7 +68,7 @@  void __brcms_dbg(struct device *dev, u32 level, const char *func,
 struct brcms_pub;
 void brcms_debugfs_init(void);
 void brcms_debugfs_exit(void);
-int brcms_debugfs_attach(struct brcms_pub *drvr);
+void brcms_debugfs_attach(struct brcms_pub *drvr);
 void brcms_debugfs_detach(struct brcms_pub *drvr);
 struct dentry *brcms_debugfs_get_devdir(struct brcms_pub *drvr);
 void brcms_debugfs_create_files(struct brcms_pub *drvr);