scsi: snic: no need to check return value of debugfs_create functions

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: Karan Tilak Kumar <[e-mail]>
Cc: Sesidhar Baddela <[e-mail]>
Cc: "James E.J. Bottomley" <[e-mail]>
Cc: "Martin K. Petersen" <[e-mail]>
Cc: [e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/snic/snic_debugfs.c

···
  * fnic directory and statistics directory for trace buffer and
  * stats logging
  */
-
-int
-snic_debugfs_init(void)
+void snic_debugfs_init(void)
 {
-	int rc = -1;
-	struct dentry *de = NULL;
+	snic_glob->trc_root = debugfs_create_dir("snic", NULL);
 
-	de = debugfs_create_dir("snic", NULL);
-	if (!de) {
-		SNIC_DBG("Cannot create debugfs root\n");
-
-		return rc;
-	}
-	snic_glob->trc_root = de;
-
-	de = debugfs_create_dir("statistics", snic_glob->trc_root);
-	if (!de) {
-		SNIC_DBG("Cannot create Statistics directory\n");
-
-		return rc;
-	}
-	snic_glob->stats_root = de;
-
-	rc = 0;
-
-	return rc;
-} /* end of snic_debugfs_init */
+	snic_glob->stats_root = debugfs_create_dir("statistics",
+						   snic_glob->trc_root);
+}
 
 /*
  * snic_debugfs_term - Tear down debugfs intrastructure
···
  * It will create file stats and reset_stats under statistics/host# directory
  * to log per snic stats
  */
-int
-snic_stats_debugfs_init(struct snic *snic)
+void snic_stats_debugfs_init(struct snic *snic)
 {
-	int rc = -1;
 	char name[16];
-	struct dentry *de = NULL;
 
 	snprintf(name, sizeof(name), "host%d", snic->shost->host_no);
-	if (!snic_glob->stats_root) {
-		SNIC_DBG("snic_stats root doesn't exist\n");
 
-		return rc;
-	}
+	snic->stats_host = debugfs_create_dir(name, snic_glob->stats_root);
 
-	de = debugfs_create_dir(name, snic_glob->stats_root);
-	if (!de) {
-		SNIC_DBG("Cannot create host directory\n");
+	snic->stats_file = debugfs_create_file("stats", S_IFREG|S_IRUGO,
+					       snic->stats_host, snic,
+					       &snic_stats_fops);
 
-		return rc;
-	}
-	snic->stats_host = de;
-
-	de = debugfs_create_file("stats",
-				S_IFREG|S_IRUGO,
-				snic->stats_host,
-				snic,
-				&snic_stats_fops);
-	if (!de) {
-		SNIC_DBG("Cannot create host's stats file\n");
-
-		return rc;
-	}
-	snic->stats_file = de;
-
-	de = debugfs_create_file("reset_stats",
-				S_IFREG|S_IRUGO|S_IWUSR,
-				snic->stats_host,
-				snic,
-				&snic_reset_stats_fops);
-
-	if (!de) {
-		SNIC_DBG("Cannot create host's reset_stats file\n");
-
-		return rc;
-	}
-	snic->reset_stats_file = de;
-	rc = 0;
-
-	return rc;
-} /* end of snic_stats_debugfs_init */
+	snic->reset_stats_file = debugfs_create_file("reset_stats",
+						     S_IFREG|S_IRUGO|S_IWUSR,
+						     snic->stats_host, snic,
+						     &snic_reset_stats_fops);
+}
 
 /*
  * snic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
···
  * snic_trc_debugfs_init : creates trace/tracing_enable files for trace
  * under debugfs
  */
-int
-snic_trc_debugfs_init(void)
+void snic_trc_debugfs_init(void)
 {
-	struct dentry *de = NULL;
-	int ret = -1;
+	snic_glob->trc.trc_enable = debugfs_create_bool("tracing_enable",
+							S_IFREG | S_IRUGO | S_IWUSR,
+							snic_glob->trc_root,
+							&snic_glob->trc.enable);
 
-	if (!snic_glob->trc_root) {
-		SNIC_ERR("Debugfs root directory for snic doesn't exist.\n");
-
-		return ret;
-	}
-
-	de = debugfs_create_bool("tracing_enable",
-				 S_IFREG | S_IRUGO | S_IWUSR,
-				 snic_glob->trc_root,
-				 &snic_glob->trc.enable);
-
-	if (!de) {
-		SNIC_ERR("Can't create trace_enable file.\n");
-
-		return ret;
-	}
-	snic_glob->trc.trc_enable = de;
-
-	de = debugfs_create_file("trace",
-				 S_IFREG | S_IRUGO | S_IWUSR,
-				 snic_glob->trc_root,
-				 NULL,
-				 &snic_trc_fops);
-
-	if (!de) {
-		SNIC_ERR("Cannot create trace file.\n");
-
-		return ret;
-	}
-	snic_glob->trc.trc_file = de;
-	ret = 0;
-
-	return ret;
-} /* end of snic_trc_debugfs_init */
+	snic_glob->trc.trc_file = debugfs_create_file("trace",
+						      S_IFREG | S_IRUGO | S_IWUSR,
+						      snic_glob->trc_root, NULL,
+						      &snic_trc_fops);
+}
 
 /*
  * snic_trc_debugfs_term : cleans up the files created for trace under debugfs

drivers/scsi/snic/snic_main.c

···
 		       PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 	/* Per snic debugfs init */
-	ret = snic_stats_debugfs_init(snic);
-	if (ret) {
-		SNIC_HOST_ERR(snic->shost,
-			      "Failed to initialize debugfs stats\n");
-		snic_stats_debugfs_remove(snic);
-	}
+	snic_stats_debugfs_init(snic);
 #endif
 
 	/* Setup PCI Resources */
···
 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 	/* Debugfs related Initialization */
 	/* Create debugfs entries for snic */
-	ret = snic_debugfs_init();
-	if (ret < 0) {
-		SNIC_ERR("Failed to create sysfs dir for tracing and stats.\n");
-		snic_debugfs_term();
-		/* continue even if it fails */
-	}
+	snic_debugfs_init();
 
 	/* Trace related Initialization */
 	/* Allocate memory for trace buffer */

drivers/scsi/snic/snic_stats.h

···
 	atomic64_t io_cmpl_skip;
 };
 
-int snic_stats_debugfs_init(struct snic *);
+void snic_stats_debugfs_init(struct snic *);
 void snic_stats_debugfs_remove(struct snic *);
 
 /* Auxillary function to update active IO counter */

drivers/scsi/snic/snic_trc.c

···
 	trc->buf = (struct snic_trc_data *) tbuf;
 	spin_lock_init(&trc->lock);
 
-	ret = snic_trc_debugfs_init();
-	if (ret) {
-		SNIC_ERR("Failed to create Debugfs Files.\n");
-
-		goto error;
-	}
+	snic_trc_debugfs_init();
 
 	trc->max_idx = (tbuf_sz / SNIC_TRC_ENTRY_SZ);
 	trc->rd_idx = trc->wr_idx = 0;
···
 	SNIC_INFO("Trace Facility Enabled.\n Trace Buffer SZ %lu Pages.\n",
 		  tbuf_sz / PAGE_SIZE);
 	ret = 0;
-
-	return ret;
-
-error:
-	snic_trc_free();
 
 	return ret;
 } /* end of snic_trc_init */

drivers/scsi/snic/snic_trc.h

···
 
 int snic_trc_init(void);
 void snic_trc_free(void);
-int snic_trc_debugfs_init(void);
+void snic_trc_debugfs_init(void);
 void snic_trc_debugfs_term(void);
 struct snic_trc_data *snic_get_trc_buf(void);
 int snic_get_trc_data(char *buf, int buf_sz);
 
-int snic_debugfs_init(void);
+void snic_debugfs_init(void);
 void snic_debugfs_term(void);
 
 static inline void