[PATCH] crypto: hisilicon - still no need to check return value of debugfs_create functions

[PATCH] crypto: hisilicon - still no need to check return value of debugfs_create functions

[Greg Kroah-Hartman]

Just like in 4a97bfc79619 ("crypto: hisilicon - no need to check return
value of debugfs_create functions"), there still 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: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/crypto/hisilicon/hpre/hpre_main.c | 28 +++++------------------
 1 file changed, 6 insertions(+), 22 deletions(-)

diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
index 34e0424410bf..711f5d18b641 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_main.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
@@ -557,7 +557,7 @@ static const struct file_operations hpre_ctrl_debug_fops = {
 static int hpre_create_debugfs_file(struct hpre_debug *dbg, struct dentry *dir,
 				    enum hpre_ctrl_dbgfs_file type, int indx)
 {
-	struct dentry *tmp, *file_dir;
+	struct dentry *file_dir;
 
 	if (dir)
 		file_dir = dir;
@@ -571,10 +571,8 @@ static int hpre_create_debugfs_file(struct hpre_debug *dbg, struct dentry *dir,
 	dbg->files[indx].debug = dbg;
 	dbg->files[indx].type = type;
 	dbg->files[indx].index = indx;
-	tmp = debugfs_create_file(hpre_debug_file_name[type], 0600, file_dir,
-				  dbg->files + indx, &hpre_ctrl_debug_fops);
-	if (!tmp)
-		return -ENOENT;
+	debugfs_create_file(hpre_debug_file_name[type], 0600, file_dir,
+			    dbg->files + indx, &hpre_ctrl_debug_fops);
 
 	return 0;
 }
@@ -585,7 +583,6 @@ static int hpre_pf_comm_regs_debugfs_init(struct hpre_debug *debug)
 	struct hisi_qm *qm = &hpre->qm;
 	struct device *dev = &qm->pdev->dev;
 	struct debugfs_regset32 *regset;
-	struct dentry *tmp;
 
 	regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
 	if (!regset)
@@ -595,10 +592,7 @@ static int hpre_pf_comm_regs_debugfs_init(struct hpre_debug *debug)
 	regset->nregs = ARRAY_SIZE(hpre_com_dfx_regs);
 	regset->base = qm->io_base;
 
-	tmp = debugfs_create_regset32("regs", 0444,  debug->debug_root, regset);
-	if (!tmp)
-		return -ENOENT;
-
+	debugfs_create_regset32("regs", 0444,  debug->debug_root, regset);
 	return 0;
 }
 
@@ -609,15 +603,12 @@ static int hpre_cluster_debugfs_init(struct hpre_debug *debug)
 	struct device *dev = &qm->pdev->dev;
 	char buf[HPRE_DBGFS_VAL_MAX_LEN];
 	struct debugfs_regset32 *regset;
-	struct dentry *tmp_d, *tmp;
+	struct dentry *tmp_d;
 	int i, ret;
 
 	for (i = 0; i < HPRE_CLUSTERS_NUM; i++) {
 		sprintf(buf, "cluster%d", i);
-
 		tmp_d = debugfs_create_dir(buf, debug->debug_root);
-		if (!tmp_d)
-			return -ENOENT;
 
 		regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
 		if (!regset)
@@ -627,9 +618,7 @@ static int hpre_cluster_debugfs_init(struct hpre_debug *debug)
 		regset->nregs = ARRAY_SIZE(hpre_cluster_dfx_regs);
 		regset->base = qm->io_base + hpre_cluster_offsets[i];
 
-		tmp = debugfs_create_regset32("regs", 0444, tmp_d, regset);
-		if (!tmp)
-			return -ENOENT;
+		debugfs_create_regset32("regs", 0444, tmp_d, regset);
 		ret = hpre_create_debugfs_file(debug, tmp_d, HPRE_CLUSTER_CTRL,
 					       i + HPRE_CLUSTER_CTRL);
 		if (ret)
@@ -668,9 +657,6 @@ static int hpre_debugfs_init(struct hpre *hpre)
 	int ret;
 
 	dir = debugfs_create_dir(dev_name(dev), hpre_debugfs_root);
-	if (!dir)
-		return -ENOENT;
-
 	qm->debug.debug_root = dir;
 
 	ret = hisi_qm_debug_init(qm);
@@ -1014,8 +1000,6 @@ static void hpre_register_debugfs(void)
 		return;
 
 	hpre_debugfs_root = debugfs_create_dir(hpre_name, NULL);
-	if (IS_ERR_OR_NULL(hpre_debugfs_root))
-		hpre_debugfs_root = NULL;
 }
 
 static void hpre_unregister_debugfs(void)
-- 
2.24.0

Re: [PATCH] crypto: hisilicon - still no need to check return value of debugfs_create functions

[Zhou Wang]

On 2019/12/9 23:21, Greg Kroah-Hartman wrote:
> Just like in 4a97bfc79619 ("crypto: hisilicon - no need to check return
> value of debugfs_create functions"), there still 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.

Thanks for fix this, +To Zaibo Xu who is the maintainer of this module :)

Best,
Zhou

> 
> Cc: Zhou Wang <wangzhou1@hisilicon.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: linux-crypto@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/crypto/hisilicon/hpre/hpre_main.c | 28 +++++------------------
>  1 file changed, 6 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
> index 34e0424410bf..711f5d18b641 100644
> --- a/drivers/crypto/hisilicon/hpre/hpre_main.c
> +++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
> @@ -557,7 +557,7 @@ static const struct file_operations hpre_ctrl_debug_fops = {
>  static int hpre_create_debugfs_file(struct hpre_debug *dbg, struct dentry *dir,
>  				    enum hpre_ctrl_dbgfs_file type, int indx)
>  {
> -	struct dentry *tmp, *file_dir;
> +	struct dentry *file_dir;
>  
>  	if (dir)
>  		file_dir = dir;
> @@ -571,10 +571,8 @@ static int hpre_create_debugfs_file(struct hpre_debug *dbg, struct dentry *dir,
>  	dbg->files[indx].debug = dbg;
>  	dbg->files[indx].type = type;
>  	dbg->files[indx].index = indx;
> -	tmp = debugfs_create_file(hpre_debug_file_name[type], 0600, file_dir,
> -				  dbg->files + indx, &hpre_ctrl_debug_fops);
> -	if (!tmp)
> -		return -ENOENT;
> +	debugfs_create_file(hpre_debug_file_name[type], 0600, file_dir,
> +			    dbg->files + indx, &hpre_ctrl_debug_fops);
>  
>  	return 0;
>  }
> @@ -585,7 +583,6 @@ static int hpre_pf_comm_regs_debugfs_init(struct hpre_debug *debug)
>  	struct hisi_qm *qm = &hpre->qm;
>  	struct device *dev = &qm->pdev->dev;
>  	struct debugfs_regset32 *regset;
> -	struct dentry *tmp;
>  
>  	regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
>  	if (!regset)
> @@ -595,10 +592,7 @@ static int hpre_pf_comm_regs_debugfs_init(struct hpre_debug *debug)
>  	regset->nregs = ARRAY_SIZE(hpre_com_dfx_regs);
>  	regset->base = qm->io_base;
>  
> -	tmp = debugfs_create_regset32("regs", 0444,  debug->debug_root, regset);
> -	if (!tmp)
> -		return -ENOENT;
> -
> +	debugfs_create_regset32("regs", 0444,  debug->debug_root, regset);
>  	return 0;
>  }
>  
> @@ -609,15 +603,12 @@ static int hpre_cluster_debugfs_init(struct hpre_debug *debug)
>  	struct device *dev = &qm->pdev->dev;
>  	char buf[HPRE_DBGFS_VAL_MAX_LEN];
>  	struct debugfs_regset32 *regset;
> -	struct dentry *tmp_d, *tmp;
> +	struct dentry *tmp_d;
>  	int i, ret;
>  
>  	for (i = 0; i < HPRE_CLUSTERS_NUM; i++) {
>  		sprintf(buf, "cluster%d", i);
> -
>  		tmp_d = debugfs_create_dir(buf, debug->debug_root);
> -		if (!tmp_d)
> -			return -ENOENT;
>  
>  		regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
>  		if (!regset)
> @@ -627,9 +618,7 @@ static int hpre_cluster_debugfs_init(struct hpre_debug *debug)
>  		regset->nregs = ARRAY_SIZE(hpre_cluster_dfx_regs);
>  		regset->base = qm->io_base + hpre_cluster_offsets[i];
>  
> -		tmp = debugfs_create_regset32("regs", 0444, tmp_d, regset);
> -		if (!tmp)
> -			return -ENOENT;
> +		debugfs_create_regset32("regs", 0444, tmp_d, regset);
>  		ret = hpre_create_debugfs_file(debug, tmp_d, HPRE_CLUSTER_CTRL,
>  					       i + HPRE_CLUSTER_CTRL);
>  		if (ret)
> @@ -668,9 +657,6 @@ static int hpre_debugfs_init(struct hpre *hpre)
>  	int ret;
>  
>  	dir = debugfs_create_dir(dev_name(dev), hpre_debugfs_root);
> -	if (!dir)
> -		return -ENOENT;
> -
>  	qm->debug.debug_root = dir;
>  
>  	ret = hisi_qm_debug_init(qm);
> @@ -1014,8 +1000,6 @@ static void hpre_register_debugfs(void)
>  		return;
>  
>  	hpre_debugfs_root = debugfs_create_dir(hpre_name, NULL);
> -	if (IS_ERR_OR_NULL(hpre_debugfs_root))
> -		hpre_debugfs_root = NULL;
>  }
>  
>  static void hpre_unregister_debugfs(void)
> 

Re: [PATCH] crypto: hisilicon - still no need to check return value of debugfs_create functions

[Xu Zaibo]

Okay, I will fix this, thanks.

Cheers,

Zaibo

.

On 2019/12/10 12:05, Zhou Wang wrote:
> On 2019/12/9 23:21, Greg Kroah-Hartman wrote:
>> Just like in 4a97bfc79619 ("crypto: hisilicon - no need to check return
>> value of debugfs_create functions"), there still 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.
> Thanks for fix this, +To Zaibo Xu who is the maintainer of this module :)
>
> Best,
> Zhou
>
>> Cc: Zhou Wang <wangzhou1@hisilicon.com>
>> Cc: Herbert Xu <herbert@gondor.apana.org.au>
>> Cc: "David S. Miller" <davem@davemloft.net>
>> Cc: linux-crypto@vger.kernel.org
>> Cc: linux-kernel@vger.kernel.org
>> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
>> ---
>>   drivers/crypto/hisilicon/hpre/hpre_main.c | 28 +++++------------------
>>   1 file changed, 6 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
>> index 34e0424410bf..711f5d18b641 100644
>> --- a/drivers/crypto/hisilicon/hpre/hpre_main.c
>> +++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
>> @@ -557,7 +557,7 @@ static const struct file_operations hpre_ctrl_debug_fops = {
>>   static int hpre_create_debugfs_file(struct hpre_debug *dbg, struct dentry *dir,
>>   				    enum hpre_ctrl_dbgfs_file type, int indx)
>>   {
>> -	struct dentry *tmp, *file_dir;
>> +	struct dentry *file_dir;
>>   
>>   	if (dir)
>>   		file_dir = dir;
>> @@ -571,10 +571,8 @@ static int hpre_create_debugfs_file(struct hpre_debug *dbg, struct dentry *dir,
>>   	dbg->files[indx].debug = dbg;
>>   	dbg->files[indx].type = type;
>>   	dbg->files[indx].index = indx;
>> -	tmp = debugfs_create_file(hpre_debug_file_name[type], 0600, file_dir,
>> -				  dbg->files + indx, &hpre_ctrl_debug_fops);
>> -	if (!tmp)
>> -		return -ENOENT;
>> +	debugfs_create_file(hpre_debug_file_name[type], 0600, file_dir,
>> +			    dbg->files + indx, &hpre_ctrl_debug_fops);
>>   
>>   	return 0;
>>   }
>> @@ -585,7 +583,6 @@ static int hpre_pf_comm_regs_debugfs_init(struct hpre_debug *debug)
>>   	struct hisi_qm *qm = &hpre->qm;
>>   	struct device *dev = &qm->pdev->dev;
>>   	struct debugfs_regset32 *regset;
>> -	struct dentry *tmp;
>>   
>>   	regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
>>   	if (!regset)
>> @@ -595,10 +592,7 @@ static int hpre_pf_comm_regs_debugfs_init(struct hpre_debug *debug)
>>   	regset->nregs = ARRAY_SIZE(hpre_com_dfx_regs);
>>   	regset->base = qm->io_base;
>>   
>> -	tmp = debugfs_create_regset32("regs", 0444,  debug->debug_root, regset);
>> -	if (!tmp)
>> -		return -ENOENT;
>> -
>> +	debugfs_create_regset32("regs", 0444,  debug->debug_root, regset);
>>   	return 0;
>>   }
>>   
>> @@ -609,15 +603,12 @@ static int hpre_cluster_debugfs_init(struct hpre_debug *debug)
>>   	struct device *dev = &qm->pdev->dev;
>>   	char buf[HPRE_DBGFS_VAL_MAX_LEN];
>>   	struct debugfs_regset32 *regset;
>> -	struct dentry *tmp_d, *tmp;
>> +	struct dentry *tmp_d;
>>   	int i, ret;
>>   
>>   	for (i = 0; i < HPRE_CLUSTERS_NUM; i++) {
>>   		sprintf(buf, "cluster%d", i);
>> -
>>   		tmp_d = debugfs_create_dir(buf, debug->debug_root);
>> -		if (!tmp_d)
>> -			return -ENOENT;
>>   
>>   		regset = devm_kzalloc(dev, sizeof(*regset), GFP_KERNEL);
>>   		if (!regset)
>> @@ -627,9 +618,7 @@ static int hpre_cluster_debugfs_init(struct hpre_debug *debug)
>>   		regset->nregs = ARRAY_SIZE(hpre_cluster_dfx_regs);
>>   		regset->base = qm->io_base + hpre_cluster_offsets[i];
>>   
>> -		tmp = debugfs_create_regset32("regs", 0444, tmp_d, regset);
>> -		if (!tmp)
>> -			return -ENOENT;
>> +		debugfs_create_regset32("regs", 0444, tmp_d, regset);
>>   		ret = hpre_create_debugfs_file(debug, tmp_d, HPRE_CLUSTER_CTRL,
>>   					       i + HPRE_CLUSTER_CTRL);
>>   		if (ret)
>> @@ -668,9 +657,6 @@ static int hpre_debugfs_init(struct hpre *hpre)
>>   	int ret;
>>   
>>   	dir = debugfs_create_dir(dev_name(dev), hpre_debugfs_root);
>> -	if (!dir)
>> -		return -ENOENT;
>> -
>>   	qm->debug.debug_root = dir;
>>   
>>   	ret = hisi_qm_debug_init(qm);
>> @@ -1014,8 +1000,6 @@ static void hpre_register_debugfs(void)
>>   		return;
>>   
>>   	hpre_debugfs_root = debugfs_create_dir(hpre_name, NULL);
>> -	if (IS_ERR_OR_NULL(hpre_debugfs_root))
>> -		hpre_debugfs_root = NULL;
>>   }
>>   
>>   static void hpre_unregister_debugfs(void)
>>
> .
>

Re: [PATCH] crypto: hisilicon - still no need to check return value of debugfs_create functions

[Herbert Xu]

On Mon, Dec 09, 2019 at 04:21:51PM +0100, Greg Kroah-Hartman wrote:
> Just like in 4a97bfc79619 ("crypto: hisilicon - no need to check return
> value of debugfs_create functions"), there still 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: Zhou Wang <wangzhou1@hisilicon.com>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: linux-crypto@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/crypto/hisilicon/hpre/hpre_main.c | 28 +++++------------------
>  1 file changed, 6 insertions(+), 22 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt