[PATCH] scsi: fnic: delete incorrect debugfs error handling

[PATCH] scsi: fnic: delete incorrect debugfs error handling

[Dan Carpenter]

Debugfs functions are not supposed to require error checking and,
in fact, adding checks would normally lead to the driver refusing to load
when CONFIG_DEBUGFS is disabled.

What saves us here is that this code checks for NULL instead of
error pointers so the error checking is all dead code.  Delete it.

Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
 drivers/scsi/fnic/fnic_debugfs.c | 25 +------------------------
 1 file changed, 1 insertion(+), 24 deletions(-)

diff --git a/drivers/scsi/fnic/fnic_debugfs.c b/drivers/scsi/fnic/fnic_debugfs.c
index caee32bc9190..5767862ae42f 100644
--- a/drivers/scsi/fnic/fnic_debugfs.c
+++ b/drivers/scsi/fnic/fnic_debugfs.c
@@ -679,46 +679,23 @@ static const struct file_operations fnic_reset_debugfs_fops = {
  */
 int fnic_stats_debugfs_init(struct fnic *fnic)
 {
-	int rc = -1;
 	char name[16];
 
 	snprintf(name, sizeof(name), "host%d", fnic->host->host_no);
 
-	if (!fnic_stats_debugfs_root) {
-		pr_debug("fnic_stats root doesn't exist\n");
-		return rc;
-	}
-
 	fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
 						fnic_stats_debugfs_root);
-
-	if (!fnic->fnic_stats_debugfs_host) {
-		pr_debug("Cannot create host directory\n");
-		return rc;
-	}
-
 	fnic->fnic_stats_debugfs_file = debugfs_create_file("stats",
 						S_IFREG|S_IRUGO|S_IWUSR,
 						fnic->fnic_stats_debugfs_host,
 						fnic,
 						&fnic_stats_debugfs_fops);
-
-	if (!fnic->fnic_stats_debugfs_file) {
-		pr_debug("Cannot create host stats file\n");
-		return rc;
-	}
-
 	fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats",
 						S_IFREG|S_IRUGO|S_IWUSR,
 						fnic->fnic_stats_debugfs_host,
 						fnic,
 						&fnic_reset_debugfs_fops);
-	if (!fnic->fnic_reset_debugfs_file) {
-		pr_debug("Cannot create host stats file\n");
-		return rc;
-	}
-	rc = 0;
-	return rc;
+	return 0;
 }
 
 /*
-- 
2.45.2

RE: [PATCH] scsi: fnic: delete incorrect debugfs error handling

[Karan Tilak Kumar (kartilak)]

On Tuesday, January 7, 2025 5:35 AM, Dan Carpenter <dan.carpenter@linaro.org> wrote:
>
> Debugfs functions are not supposed to require error checking and,
> in fact, adding checks would normally lead to the driver refusing to load
> when CONFIG_DEBUGFS is disabled.
>
> What saves us here is that this code checks for NULL instead of
> error pointers so the error checking is all dead code.  Delete it.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
> ---
> drivers/scsi/fnic/fnic_debugfs.c | 25 +------------------------
> 1 file changed, 1 insertion(+), 24 deletions(-)
>
> diff --git a/drivers/scsi/fnic/fnic_debugfs.c b/drivers/scsi/fnic/fnic_debugfs.c
> index caee32bc9190..5767862ae42f 100644
> --- a/drivers/scsi/fnic/fnic_debugfs.c
> +++ b/drivers/scsi/fnic/fnic_debugfs.c
> @@ -679,46 +679,23 @@ static const struct file_operations fnic_reset_debugfs_fops = {
> */
> int fnic_stats_debugfs_init(struct fnic *fnic)
> {
> -     int rc = -1;
> char name[16];
>
> snprintf(name, sizeof(name), "host%d", fnic->host->host_no);
>
> -     if (!fnic_stats_debugfs_root) {
> -             pr_debug("fnic_stats root doesn't exist\n");
> -             return rc;
> -     }
> -
> fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
> fnic_stats_debugfs_root);
> -
> -     if (!fnic->fnic_stats_debugfs_host) {
> -             pr_debug("Cannot create host directory\n");
> -             return rc;
> -     }
> -
> fnic->fnic_stats_debugfs_file = debugfs_create_file("stats",
> S_IFREG|S_IRUGO|S_IWUSR,
> fnic->fnic_stats_debugfs_host,
> fnic,
> &fnic_stats_debugfs_fops);
> -
> -     if (!fnic->fnic_stats_debugfs_file) {
> -             pr_debug("Cannot create host stats file\n");
> -             return rc;
> -     }
> -
> fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats",
> S_IFREG|S_IRUGO|S_IWUSR,
> fnic->fnic_stats_debugfs_host,
> fnic,
> &fnic_reset_debugfs_fops);
> -     if (!fnic->fnic_reset_debugfs_file) {
> -             pr_debug("Cannot create host stats file\n");
> -             return rc;
> -     }
> -     rc = 0;
> -     return rc;
> +     return 0;
> }
>
> /*
> --
> 2.45.2
>
>
Changes look good. Thanks for these changes.

Reviewed-by: Karan Tilak Kumar <kartilak@cisco.com>

Regards,
Karan