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

[PATCH] iwlwifi: fw: 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: 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: linux-wireless@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/wireless/intel/iwlwifi/fw/debugfs.c | 11 +++--------
 drivers/net/wireless/intel/iwlwifi/fw/debugfs.h |  9 +++------
 2 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/debugfs.c b/drivers/net/wireless/intel/iwlwifi/fw/debugfs.c
index 3e120dd47305..c1aa4360736b 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/debugfs.c
@@ -173,9 +173,8 @@ static const struct file_operations iwl_dbgfs_##name##_ops = {		\
 	_FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_fw_runtime)
 
 #define FWRT_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode) do {	\
-	if (!debugfs_create_file(alias, mode, parent, fwrt,		\
-				 &iwl_dbgfs_##name##_ops))		\
-		goto err;						\
+	debugfs_create_file(alias, mode, parent, fwrt,			\
+			    &iwl_dbgfs_##name##_ops);			\
 	} while (0)
 #define FWRT_DEBUGFS_ADD_FILE(name, parent, mode) \
 	FWRT_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode)
@@ -321,14 +320,10 @@ static ssize_t iwl_dbgfs_send_hcmd_write(struct iwl_fw_runtime *fwrt, char *buf,
 
 FWRT_DEBUGFS_WRITE_FILE_OPS(send_hcmd, 512);
 
-int iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
+void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
 			    struct dentry *dbgfs_dir)
 {
 	INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
 	FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
 	FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200);
-	return 0;
-err:
-	IWL_ERR(fwrt, "Can't create the fwrt debugfs directory\n");
-	return -ENOMEM;
 }
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/debugfs.h b/drivers/net/wireless/intel/iwlwifi/fw/debugfs.h
index 88255035e8ef..fde40ff88451 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/debugfs.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/debugfs.h
@@ -63,14 +63,11 @@
 #include "runtime.h"
 
 #ifdef CONFIG_IWLWIFI_DEBUGFS
-int iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
+void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
 			    struct dentry *dbgfs_dir);
 
 #else
-static inline int iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
-					  struct dentry *dbgfs_dir)
-{
-	return 0;
-}
+static inline void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
+					   struct dentry *dbgfs_dir) { }
 
 #endif /* CONFIG_IWLWIFI_DEBUGFS */
-- 
2.20.1

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

[Luciano Coelho]

On Tue, 2019-01-22 at 16:21 +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: 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: linux-wireless@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---


Thanks, Greg! I applied this in our internal tree and it will reach
upstream following our normal upstreaming process.

--
Cheers,
Luca.