drivers/scsi/qla2xxx/qla_dfs.c

   1 /*
   2  * QLogic Fibre Channel HBA Driver
   3  * Copyright (c)  2003-2014 QLogic Corporation
   4  *
   5  * See LICENSE.qla2xxx for copyright and licensing details.
   6  */
   7 #include "qla_def.h"
   8
   9 #include <linux/debugfs.h>
  10 #include <linux/seq_file.h>
  11
  12 static struct dentry *qla2x00_dfs_root;
  13 static atomic_t qla2x00_dfs_root_count;
  14
  15 static int
  16 qla2x00_dfs_tgt_sess_show(struct seq_file *s, void *unused)
  17 {
  18         scsi_qla_host_t *vha = s->private;
  19         struct qla_hw_data *ha = vha->hw;
  20         unsigned long flags;
  21         struct fc_port *sess = NULL;
  22         struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  23
  24         seq_printf(s, "%s\n", vha->host_str);
  25         if (tgt) {
  26                 seq_puts(s, "Port ID   Port Name                Handle\n");
  27
  28                 spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  29                 list_for_each_entry(sess, &vha->vp_fcports, list)
  30                         seq_printf(s, "%02x:%02x:%02x  %8phC  %d\n",
  31                             sess->d_id.b.domain, sess->d_id.b.area,
  32                             sess->d_id.b.al_pa, sess->port_name,
  33                             sess->loop_id);
  34                 spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  35         }
  36
  37         return 0;
  38 }
  39
  40 static int
  41 qla2x00_dfs_tgt_sess_open(struct inode *inode, struct file *file)
  42 {
  43         scsi_qla_host_t *vha = inode->i_private;
  44         return single_open(file, qla2x00_dfs_tgt_sess_show, vha);
  45 }
  46
  47 static const struct file_operations dfs_tgt_sess_ops = {
  48         .open           = qla2x00_dfs_tgt_sess_open,
  49         .read           = seq_read,
  50         .llseek         = seq_lseek,
  51         .release        = single_release,
  52 };
  53
  54 static int
  55 qla2x00_dfs_tgt_port_database_show(struct seq_file *s, void *unused)
  56 {
  57         scsi_qla_host_t *vha = s->private;
  58         struct qla_hw_data *ha = vha->hw;
  59         struct gid_list_info *gid_list;
  60         dma_addr_t gid_list_dma;
  61         fc_port_t fc_port;
  62         char *id_iter;
  63         int rc, i;
  64         uint16_t entries, loop_id;
  65         struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  66
  67         seq_printf(s, "%s\n", vha->host_str);
  68         if (tgt) {
  69                 gid_list = dma_alloc_coherent(&ha->pdev->dev,
  70                     qla2x00_gid_list_size(ha),
  71                     &gid_list_dma, GFP_KERNEL);
  72                 if (!gid_list) {
  73                         ql_dbg(ql_dbg_user, vha, 0x7018,
  74                             "DMA allocation failed for %u\n",
  75                              qla2x00_gid_list_size(ha));
  76                         return 0;
  77                 }
  78
  79                 rc = qla24xx_gidlist_wait(vha, gid_list, gid_list_dma,
  80                     &entries);
  81                 if (rc != QLA_SUCCESS)
  82                         goto out_free_id_list;
  83
  84                 id_iter = (char *)gid_list;
  85
  86                 seq_puts(s, "Port Name  Port ID         Loop ID\n");
  87
  88                 for (i = 0; i < entries; i++) {
  89                         struct gid_list_info *gid =
  90                             (struct gid_list_info *)id_iter;
  91                         loop_id = le16_to_cpu(gid->loop_id);
  92                         memset(&fc_port, 0, sizeof(fc_port_t));
  93
  94                         fc_port.loop_id = loop_id;
  95
  96                         rc = qla24xx_gpdb_wait(vha, &fc_port, 0);
  97                         seq_printf(s, "%8phC  %02x%02x%02x  %d\n",
  98                                 fc_port.port_name, fc_port.d_id.b.domain,
  99                                 fc_port.d_id.b.area, fc_port.d_id.b.al_pa,
 100                                 fc_port.loop_id);
 101                         id_iter += ha->gid_list_info_size;
 102                 }
 103 out_free_id_list:
 104                 dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
 105                     gid_list, gid_list_dma);
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int
 112 qla2x00_dfs_tgt_port_database_open(struct inode *inode, struct file *file)
 113 {
 114         scsi_qla_host_t *vha = inode->i_private;
 115
 116         return single_open(file, qla2x00_dfs_tgt_port_database_show, vha);
 117 }
 118
 119 static const struct file_operations dfs_tgt_port_database_ops = {
 120         .open           = qla2x00_dfs_tgt_port_database_open,
 121         .read           = seq_read,
 122         .llseek         = seq_lseek,
 123         .release        = single_release,
 124 };
 125
 126 static int
 127 qla_dfs_fw_resource_cnt_show(struct seq_file *s, void *unused)
 128 {
 129         struct scsi_qla_host *vha = s->private;
 130         uint16_t mb[MAX_IOCB_MB_REG];
 131         int rc;
 132
 133         rc = qla24xx_res_count_wait(vha, mb, SIZEOF_IOCB_MB_REG);
 134         if (rc != QLA_SUCCESS) {
 135                 seq_printf(s, "Mailbox Command failed %d, mb %#x", rc, mb[0]);
 136         } else {
 137                 seq_puts(s, "FW Resource count\n\n");
 138                 seq_printf(s, "Original TGT exchg count[%d]\n", mb[1]);
 139                 seq_printf(s, "current TGT exchg count[%d]\n", mb[2]);
 140                 seq_printf(s, "original Initiator Exchange count[%d]\n", mb[3]);
 141                 seq_printf(s, "Current Initiator Exchange count[%d]\n", mb[6]);
 142                 seq_printf(s, "Original IOCB count[%d]\n", mb[7]);
 143                 seq_printf(s, "Current IOCB count[%d]\n", mb[10]);
 144                 seq_printf(s, "MAX VP count[%d]\n", mb[11]);
 145                 seq_printf(s, "MAX FCF count[%d]\n", mb[12]);
 146                 seq_printf(s, "Current free pageable XCB buffer cnt[%d]\n",
 147                     mb[20]);
 148                 seq_printf(s, "Original Initiator fast XCB buffer cnt[%d]\n",
 149                     mb[21]);
 150                 seq_printf(s, "Current free Initiator fast XCB buffer cnt[%d]\n",
 151                     mb[22]);
 152                 seq_printf(s, "Original Target fast XCB buffer cnt[%d]\n",
 153                     mb[23]);
 154
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int
 161 qla_dfs_fw_resource_cnt_open(struct inode *inode, struct file *file)
 162 {
 163         struct scsi_qla_host *vha = inode->i_private;
 164         return single_open(file, qla_dfs_fw_resource_cnt_show, vha);
 165 }
 166
 167 static const struct file_operations dfs_fw_resource_cnt_ops = {
 168         .open           = qla_dfs_fw_resource_cnt_open,
 169         .read           = seq_read,
 170         .llseek         = seq_lseek,
 171         .release        = single_release,
 172 };
 173
 174 static int
 175 qla_dfs_tgt_counters_show(struct seq_file *s, void *unused)
 176 {
 177         struct scsi_qla_host *vha = s->private;
 178         struct qla_qpair *qpair = vha->hw->base_qpair;
 179         uint64_t qla_core_sbt_cmd, core_qla_que_buf, qla_core_ret_ctio,
 180                 core_qla_snd_status, qla_core_ret_sta_ctio, core_qla_free_cmd,
 181                 num_q_full_sent, num_alloc_iocb_failed, num_term_xchg_sent;
 182         u16 i;
 183
 184         qla_core_sbt_cmd = qpair->tgt_counters.qla_core_sbt_cmd;
 185         core_qla_que_buf = qpair->tgt_counters.core_qla_que_buf;
 186         qla_core_ret_ctio = qpair->tgt_counters.qla_core_ret_ctio;
 187         core_qla_snd_status = qpair->tgt_counters.core_qla_snd_status;
 188         qla_core_ret_sta_ctio = qpair->tgt_counters.qla_core_ret_sta_ctio;
 189         core_qla_free_cmd = qpair->tgt_counters.core_qla_free_cmd;
 190         num_q_full_sent = qpair->tgt_counters.num_q_full_sent;
 191         num_alloc_iocb_failed = qpair->tgt_counters.num_alloc_iocb_failed;
 192         num_term_xchg_sent = qpair->tgt_counters.num_term_xchg_sent;
 193
 194         for (i = 0; i < vha->hw->max_qpairs; i++) {
 195                 qpair = vha->hw->queue_pair_map[i];
 196                 qla_core_sbt_cmd += qpair->tgt_counters.qla_core_sbt_cmd;
 197                 core_qla_que_buf += qpair->tgt_counters.core_qla_que_buf;
 198                 qla_core_ret_ctio += qpair->tgt_counters.qla_core_ret_ctio;
 199                 core_qla_snd_status += qpair->tgt_counters.core_qla_snd_status;
 200                 qla_core_ret_sta_ctio +=
 201                     qpair->tgt_counters.qla_core_ret_sta_ctio;
 202                 core_qla_free_cmd += qpair->tgt_counters.core_qla_free_cmd;
 203                 num_q_full_sent += qpair->tgt_counters.num_q_full_sent;
 204                 num_alloc_iocb_failed +=
 205                     qpair->tgt_counters.num_alloc_iocb_failed;
 206                 num_term_xchg_sent += qpair->tgt_counters.num_term_xchg_sent;
 207         }
 208
 209         seq_puts(s, "Target Counters\n");
 210         seq_printf(s, "qla_core_sbt_cmd = %lld\n",
 211                 qla_core_sbt_cmd);
 212         seq_printf(s, "qla_core_ret_sta_ctio = %lld\n",
 213                 qla_core_ret_sta_ctio);
 214         seq_printf(s, "qla_core_ret_ctio = %lld\n",
 215                 qla_core_ret_ctio);
 216         seq_printf(s, "core_qla_que_buf = %lld\n",
 217                 core_qla_que_buf);
 218         seq_printf(s, "core_qla_snd_status = %lld\n",
 219                 core_qla_snd_status);
 220         seq_printf(s, "core_qla_free_cmd = %lld\n",
 221                 core_qla_free_cmd);
 222         seq_printf(s, "num alloc iocb failed = %lld\n",
 223                 num_alloc_iocb_failed);
 224         seq_printf(s, "num term exchange sent = %lld\n",
 225                 num_term_xchg_sent);
 226         seq_printf(s, "num Q full sent = %lld\n",
 227                 num_q_full_sent);
 228
 229         /* DIF stats */
 230         seq_printf(s, "DIF Inp Bytes = %lld\n",
 231                 vha->qla_stats.qla_dif_stats.dif_input_bytes);
 232         seq_printf(s, "DIF Outp Bytes = %lld\n",
 233                 vha->qla_stats.qla_dif_stats.dif_output_bytes);
 234         seq_printf(s, "DIF Inp Req = %lld\n",
 235                 vha->qla_stats.qla_dif_stats.dif_input_requests);
 236         seq_printf(s, "DIF Outp Req = %lld\n",
 237                 vha->qla_stats.qla_dif_stats.dif_output_requests);
 238         seq_printf(s, "DIF Guard err = %d\n",
 239                 vha->qla_stats.qla_dif_stats.dif_guard_err);
 240         seq_printf(s, "DIF Ref tag err = %d\n",
 241                 vha->qla_stats.qla_dif_stats.dif_ref_tag_err);
 242         seq_printf(s, "DIF App tag err = %d\n",
 243                 vha->qla_stats.qla_dif_stats.dif_app_tag_err);
 244         return 0;
 245 }
 246
 247 static int
 248 qla_dfs_tgt_counters_open(struct inode *inode, struct file *file)
 249 {
 250         struct scsi_qla_host *vha = inode->i_private;
 251         return single_open(file, qla_dfs_tgt_counters_show, vha);
 252 }
 253
 254 static const struct file_operations dfs_tgt_counters_ops = {
 255         .open           = qla_dfs_tgt_counters_open,
 256         .read           = seq_read,
 257         .llseek         = seq_lseek,
 258         .release        = single_release,
 259 };
 260
 261 static int
 262 qla2x00_dfs_fce_show(struct seq_file *s, void *unused)
 263 {
 264         scsi_qla_host_t *vha = s->private;
 265         uint32_t cnt;
 266         uint32_t *fce;
 267         uint64_t fce_start;
 268         struct qla_hw_data *ha = vha->hw;
 269
 270         mutex_lock(&ha->fce_mutex);
 271
 272         seq_puts(s, "FCE Trace Buffer\n");
 273         seq_printf(s, "In Pointer = %llx\n\n", (unsigned long long)ha->fce_wr);
 274         seq_printf(s, "Base = %llx\n\n", (unsigned long long) ha->fce_dma);
 275         seq_puts(s, "FCE Enable Registers\n");
 276         seq_printf(s, "%08x %08x %08x %08x %08x %08x\n",
 277             ha->fce_mb[0], ha->fce_mb[2], ha->fce_mb[3], ha->fce_mb[4],
 278             ha->fce_mb[5], ha->fce_mb[6]);
 279
 280         fce = (uint32_t *) ha->fce;
 281         fce_start = (unsigned long long) ha->fce_dma;
 282         for (cnt = 0; cnt < fce_calc_size(ha->fce_bufs) / 4; cnt++) {
 283                 if (cnt % 8 == 0)
 284                         seq_printf(s, "\n%llx: ",
 285                             (unsigned long long)((cnt * 4) + fce_start));
 286                 else
 287                         seq_putc(s, ' ');
 288                 seq_printf(s, "%08x", *fce++);
 289         }
 290
 291         seq_puts(s, "\nEnd\n");
 292
 293         mutex_unlock(&ha->fce_mutex);
 294
 295         return 0;
 296 }
 297
 298 static int
 299 qla2x00_dfs_fce_open(struct inode *inode, struct file *file)
 300 {
 301         scsi_qla_host_t *vha = inode->i_private;
 302         struct qla_hw_data *ha = vha->hw;
 303         int rval;
 304
 305         if (!ha->flags.fce_enabled)
 306                 goto out;
 307
 308         mutex_lock(&ha->fce_mutex);
 309
 310         /* Pause tracing to flush FCE buffers. */
 311         rval = qla2x00_disable_fce_trace(vha, &ha->fce_wr, &ha->fce_rd);
 312         if (rval)
 313                 ql_dbg(ql_dbg_user, vha, 0x705c,
 314                     "DebugFS: Unable to disable FCE (%d).\n", rval);
 315
 316         ha->flags.fce_enabled = 0;
 317
 318         mutex_unlock(&ha->fce_mutex);
 319 out:
 320         return single_open(file, qla2x00_dfs_fce_show, vha);
 321 }
 322
 323 static int
 324 qla2x00_dfs_fce_release(struct inode *inode, struct file *file)
 325 {
 326         scsi_qla_host_t *vha = inode->i_private;
 327         struct qla_hw_data *ha = vha->hw;
 328         int rval;
 329
 330         if (ha->flags.fce_enabled)
 331                 goto out;
 332
 333         mutex_lock(&ha->fce_mutex);
 334
 335         /* Re-enable FCE tracing. */
 336         ha->flags.fce_enabled = 1;
 337         memset(ha->fce, 0, fce_calc_size(ha->fce_bufs));
 338         rval = qla2x00_enable_fce_trace(vha, ha->fce_dma, ha->fce_bufs,
 339             ha->fce_mb, &ha->fce_bufs);
 340         if (rval) {
 341                 ql_dbg(ql_dbg_user, vha, 0x700d,
 342                     "DebugFS: Unable to reinitialize FCE (%d).\n", rval);
 343                 ha->flags.fce_enabled = 0;
 344         }
 345
 346         mutex_unlock(&ha->fce_mutex);
 347 out:
 348         return single_release(inode, file);
 349 }
 350
 351 static const struct file_operations dfs_fce_ops = {
 352         .open           = qla2x00_dfs_fce_open,
 353         .read           = seq_read,
 354         .llseek         = seq_lseek,
 355         .release        = qla2x00_dfs_fce_release,
 356 };
 357
 358 static int
 359 qla_dfs_naqp_show(struct seq_file *s, void *unused)
 360 {
 361         struct scsi_qla_host *vha = s->private;
 362         struct qla_hw_data *ha = vha->hw;
 363
 364         seq_printf(s, "%d\n", ha->tgt.num_act_qpairs);
 365         return 0;
 366 }
 367
 368 static int
 369 qla_dfs_naqp_open(struct inode *inode, struct file *file)
 370 {
 371         struct scsi_qla_host *vha = inode->i_private;
 372
 373         return single_open(file, qla_dfs_naqp_show, vha);
 374 }
 375
 376 static ssize_t
 377 qla_dfs_naqp_write(struct file *file, const char __user *buffer,
 378     size_t count, loff_t *pos)
 379 {
 380         struct seq_file *s = file->private_data;
 381         struct scsi_qla_host *vha = s->private;
 382         struct qla_hw_data *ha = vha->hw;
 383         char *buf;
 384         int rc = 0;
 385         unsigned long num_act_qp;
 386
 387         if (!(IS_QLA27XX(ha) || IS_QLA83XX(ha))) {
 388                 pr_err("host%ld: this adapter does not support Multi Q.",
 389                     vha->host_no);
 390                 return -EINVAL;
 391         }
 392
 393         if (!vha->flags.qpairs_available) {
 394                 pr_err("host%ld: Driver is not setup with Multi Q.",
 395                     vha->host_no);
 396                 return -EINVAL;
 397         }
 398         buf = memdup_user_nul(buffer, count);
 399         if (IS_ERR(buf)) {
 400                 pr_err("host%ld: fail to copy user buffer.",
 401                     vha->host_no);
 402                 return PTR_ERR(buf);
 403         }
 404
 405         num_act_qp = simple_strtoul(buf, NULL, 0);
 406
 407         if (num_act_qp >= vha->hw->max_qpairs) {
 408                 pr_err("User set invalid number of qpairs %lu. Max = %d",
 409                     num_act_qp, vha->hw->max_qpairs);
 410                 rc = -EINVAL;
 411                 goto out_free;
 412         }
 413
 414         if (num_act_qp != ha->tgt.num_act_qpairs) {
 415                 ha->tgt.num_act_qpairs = num_act_qp;
 416                 qlt_clr_qp_table(vha);
 417         }
 418         rc = count;
 419 out_free:
 420         kfree(buf);
 421         return rc;
 422 }
 423
 424 static const struct file_operations dfs_naqp_ops = {
 425         .open           = qla_dfs_naqp_open,
 426         .read           = seq_read,
 427         .llseek         = seq_lseek,
 428         .release        = single_release,
 429         .write          = qla_dfs_naqp_write,
 430 };
 431
 432
 433 int
 434 qla2x00_dfs_setup(scsi_qla_host_t *vha)
 435 {
 436         struct qla_hw_data *ha = vha->hw;
 437
 438         if (!IS_QLA25XX(ha) && !IS_QLA81XX(ha) && !IS_QLA83XX(ha) &&
 439             !IS_QLA27XX(ha))
 440                 goto out;
 441         if (!ha->fce)
 442                 goto out;
 443
 444         if (qla2x00_dfs_root)
 445                 goto create_dir;
 446
 447         atomic_set(&qla2x00_dfs_root_count, 0);
 448         qla2x00_dfs_root = debugfs_create_dir(QLA2XXX_DRIVER_NAME, NULL);
 449         if (!qla2x00_dfs_root) {
 450                 ql_log(ql_log_warn, vha, 0x00f7,
 451                     "Unable to create debugfs root directory.\n");
 452                 goto out;
 453         }
 454
 455 create_dir:
 456         if (ha->dfs_dir)
 457                 goto create_nodes;
 458
 459         mutex_init(&ha->fce_mutex);
 460         ha->dfs_dir = debugfs_create_dir(vha->host_str, qla2x00_dfs_root);
 461         if (!ha->dfs_dir) {
 462                 ql_log(ql_log_warn, vha, 0x00f8,
 463                     "Unable to create debugfs ha directory.\n");
 464                 goto out;
 465         }
 466
 467         atomic_inc(&qla2x00_dfs_root_count);
 468
 469 create_nodes:
 470         ha->dfs_fw_resource_cnt = debugfs_create_file("fw_resource_count",
 471             S_IRUSR, ha->dfs_dir, vha, &dfs_fw_resource_cnt_ops);
 472         if (!ha->dfs_fw_resource_cnt) {
 473                 ql_log(ql_log_warn, vha, 0x00fd,
 474                     "Unable to create debugFS fw_resource_count node.\n");
 475                 goto out;
 476         }
 477
 478         ha->dfs_tgt_counters = debugfs_create_file("tgt_counters", S_IRUSR,
 479             ha->dfs_dir, vha, &dfs_tgt_counters_ops);
 480         if (!ha->dfs_tgt_counters) {
 481                 ql_log(ql_log_warn, vha, 0xd301,
 482                     "Unable to create debugFS tgt_counters node.\n");
 483                 goto out;
 484         }
 485
 486         ha->tgt.dfs_tgt_port_database = debugfs_create_file("tgt_port_database",
 487             S_IRUSR,  ha->dfs_dir, vha, &dfs_tgt_port_database_ops);
 488         if (!ha->tgt.dfs_tgt_port_database) {
 489                 ql_log(ql_log_warn, vha, 0xd03f,
 490                     "Unable to create debugFS tgt_port_database node.\n");
 491                 goto out;
 492         }
 493
 494         ha->dfs_fce = debugfs_create_file("fce", S_IRUSR, ha->dfs_dir, vha,
 495             &dfs_fce_ops);
 496         if (!ha->dfs_fce) {
 497                 ql_log(ql_log_warn, vha, 0x00f9,
 498                     "Unable to create debugfs fce node.\n");
 499                 goto out;
 500         }
 501
 502         ha->tgt.dfs_tgt_sess = debugfs_create_file("tgt_sess",
 503                 S_IRUSR, ha->dfs_dir, vha, &dfs_tgt_sess_ops);
 504         if (!ha->tgt.dfs_tgt_sess) {
 505                 ql_log(ql_log_warn, vha, 0xd040,
 506                     "Unable to create debugFS tgt_sess node.\n");
 507                 goto out;
 508         }
 509
 510         if (IS_QLA27XX(ha) || IS_QLA83XX(ha)) {
 511                 ha->tgt.dfs_naqp = debugfs_create_file("naqp",
 512                     0400, ha->dfs_dir, vha, &dfs_naqp_ops);
 513                 if (!ha->tgt.dfs_naqp) {
 514                         ql_log(ql_log_warn, vha, 0xd011,
 515                             "Unable to create debugFS naqp node.\n");
 516                         goto out;
 517                 }
 518         }
 519 out:
 520         return 0;
 521 }
 522
 523 int
 524 qla2x00_dfs_remove(scsi_qla_host_t *vha)
 525 {
 526         struct qla_hw_data *ha = vha->hw;
 527
 528         if (ha->tgt.dfs_naqp) {
 529                 debugfs_remove(ha->tgt.dfs_naqp);
 530                 ha->tgt.dfs_naqp = NULL;
 531         }
 532
 533         if (ha->tgt.dfs_tgt_sess) {
 534                 debugfs_remove(ha->tgt.dfs_tgt_sess);
 535                 ha->tgt.dfs_tgt_sess = NULL;
 536         }
 537
 538         if (ha->tgt.dfs_tgt_port_database) {
 539                 debugfs_remove(ha->tgt.dfs_tgt_port_database);
 540                 ha->tgt.dfs_tgt_port_database = NULL;
 541         }
 542
 543         if (ha->dfs_fw_resource_cnt) {
 544                 debugfs_remove(ha->dfs_fw_resource_cnt);
 545                 ha->dfs_fw_resource_cnt = NULL;
 546         }
 547
 548         if (ha->dfs_tgt_counters) {
 549                 debugfs_remove(ha->dfs_tgt_counters);
 550                 ha->dfs_tgt_counters = NULL;
 551         }
 552
 553         if (ha->dfs_fce) {
 554                 debugfs_remove(ha->dfs_fce);
 555                 ha->dfs_fce = NULL;
 556         }
 557
 558         if (ha->dfs_dir) {
 559                 debugfs_remove(ha->dfs_dir);
 560                 ha->dfs_dir = NULL;
 561                 atomic_dec(&qla2x00_dfs_root_count);
 562         }
 563
 564         if (atomic_read(&qla2x00_dfs_root_count) == 0 &&
 565             qla2x00_dfs_root) {
 566                 debugfs_remove(qla2x00_dfs_root);
 567                 qla2x00_dfs_root = NULL;
 568         }
 569
 570         return 0;
 571 }