drivers/misc/mei/interrupt.c

   1 /*
   2  *
   3  * Intel Management Engine Interface (Intel MEI) Linux driver
   4  * Copyright (c) 2003-2012, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  */
  16
  17
  18 #include <linux/export.h>
  19 #include <linux/pci.h>
  20 #include <linux/kthread.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/fs.h>
  23 #include <linux/jiffies.h>
  24
  25 #include <linux/mei.h>
  26
  27 #include "mei_dev.h"
  28 #include "hbm.h"
  29 #include "hw-me.h"
  30 #include "client.h"
  31
  32
  33 /**
  34  * mei_irq_compl_handler - dispatch complete handlers
  35  *      for the completed callbacks
  36  *
  37  * @dev - mei device
  38  * @compl_list - list of completed cbs
  39  */
  40 void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *compl_list)
  41 {
  42         struct mei_cl_cb *cb, *next;
  43         struct mei_cl *cl;
  44
  45         list_for_each_entry_safe(cb, next, &compl_list->list, list) {
  46                 cl = cb->cl;
  47                 list_del(&cb->list);
  48                 if (!cl)
  49                         continue;
  50
  51                 dev_dbg(&dev->pdev->dev, "completing call back.\n");
  52                 if (cl == &dev->iamthif_cl)
  53                         mei_amthif_complete(dev, cb);
  54                 else
  55                         mei_cl_complete(cl, cb);
  56         }
  57 }
  58 EXPORT_SYMBOL_GPL(mei_irq_compl_handler);
  59
  60 /**
  61  * mei_cl_hbm_equal - check if hbm is addressed to the client
  62  *
  63  * @cl: host client
  64  * @mei_hdr: header of mei client message
  65  *
  66  * returns true if matches, false otherwise
  67  */
  68 static inline int mei_cl_hbm_equal(struct mei_cl *cl,
  69                         struct mei_msg_hdr *mei_hdr)
  70 {
  71         return cl->host_client_id == mei_hdr->host_addr &&
  72                 cl->me_client_id == mei_hdr->me_addr;
  73 }
  74 /**
  75  * mei_cl_is_reading - checks if the client
  76                 is the one to read this message
  77  *
  78  * @cl: mei client
  79  * @mei_hdr: header of mei message
  80  *
  81  * returns true on match and false otherwise
  82  */
  83 static bool mei_cl_is_reading(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr)
  84 {
  85         return mei_cl_hbm_equal(cl, mei_hdr) &&
  86                 cl->state == MEI_FILE_CONNECTED &&
  87                 cl->reading_state != MEI_READ_COMPLETE;
  88 }
  89
  90 /**
  91  * mei_irq_read_client_message - process client message
  92  *
  93  * @dev: the device structure
  94  * @mei_hdr: header of mei client message
  95  * @complete_list: An instance of our list structure
  96  *
  97  * returns 0 on success, <0 on failure.
  98  */
  99 static int mei_cl_irq_read_msg(struct mei_device *dev,
 100                                struct mei_msg_hdr *mei_hdr,
 101                                struct mei_cl_cb *complete_list)
 102 {
 103         struct mei_cl *cl;
 104         struct mei_cl_cb *cb, *next;
 105         unsigned char *buffer = NULL;
 106
 107         list_for_each_entry_safe(cb, next, &dev->read_list.list, list) {
 108                 cl = cb->cl;
 109                 if (!cl || !mei_cl_is_reading(cl, mei_hdr))
 110                         continue;
 111
 112                 cl->reading_state = MEI_READING;
 113
 114                 if (cb->response_buffer.size == 0 ||
 115                     cb->response_buffer.data == NULL) {
 116                         cl_err(dev, cl, "response buffer is not allocated.\n");
 117                         list_del(&cb->list);
 118                         return -ENOMEM;
 119                 }
 120
 121                 if (cb->response_buffer.size < mei_hdr->length + cb->buf_idx) {
 122                         cl_dbg(dev, cl, "message overflow. size %d len %d idx %ld\n",
 123                                 cb->response_buffer.size,
 124                                 mei_hdr->length, cb->buf_idx);
 125                         buffer = krealloc(cb->response_buffer.data,
 126                                           mei_hdr->length + cb->buf_idx,
 127                                           GFP_KERNEL);
 128
 129                         if (!buffer) {
 130                                 cl_err(dev, cl, "allocation failed.\n");
 131                                 list_del(&cb->list);
 132                                 return -ENOMEM;
 133                         }
 134                         cb->response_buffer.data = buffer;
 135                         cb->response_buffer.size =
 136                                 mei_hdr->length + cb->buf_idx;
 137                 }
 138
 139                 buffer = cb->response_buffer.data + cb->buf_idx;
 140                 mei_read_slots(dev, buffer, mei_hdr->length);
 141
 142                 cb->buf_idx += mei_hdr->length;
 143                 if (mei_hdr->msg_complete) {
 144                         cl->status = 0;
 145                         list_del(&cb->list);
 146                         cl_dbg(dev, cl, "completed read length = %lu\n",
 147                                 cb->buf_idx);
 148                         list_add_tail(&cb->list, &complete_list->list);
 149                 }
 150                 break;
 151         }
 152
 153         dev_dbg(&dev->pdev->dev, "message read\n");
 154         if (!buffer) {
 155                 mei_read_slots(dev, dev->rd_msg_buf, mei_hdr->length);
 156                 dev_dbg(&dev->pdev->dev, "discarding message " MEI_HDR_FMT "\n",
 157                                 MEI_HDR_PRM(mei_hdr));
 158         }
 159
 160         return 0;
 161 }
 162
 163 /**
 164  * mei_cl_irq_disconnect_rsp - send disconnection response message
 165  *
 166  * @cl: client
 167  * @cb: callback block.
 168  * @slots: free slots.
 169  * @cmpl_list: complete list.
 170  *
 171  * returns 0, OK; otherwise, error.
 172  */
 173 static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
 174                         s32 *slots, struct mei_cl_cb *cmpl_list)
 175 {
 176         struct mei_device *dev = cl->dev;
 177         int ret;
 178
 179         u32 msg_slots =
 180                 mei_data2slots(sizeof(struct hbm_client_connect_response));
 181
 182         if (*slots < msg_slots)
 183                 return -EMSGSIZE;
 184
 185         *slots -= msg_slots;
 186
 187         ret = mei_hbm_cl_disconnect_rsp(dev, cl);
 188
 189         cl->state = MEI_FILE_DISCONNECTED;
 190         cl->status = 0;
 191         mei_io_cb_free(cb);
 192
 193         return ret;
 194 }
 195
 196
 197
 198 /**
 199  * mei_cl_irq_close - processes close related operation from
 200  *      interrupt thread context - send disconnect request
 201  *
 202  * @cl: client
 203  * @cb: callback block.
 204  * @slots: free slots.
 205  * @cmpl_list: complete list.
 206  *
 207  * returns 0, OK; otherwise, error.
 208  */
 209 static int mei_cl_irq_close(struct mei_cl *cl, struct mei_cl_cb *cb,
 210                         s32 *slots, struct mei_cl_cb *cmpl_list)
 211 {
 212         struct mei_device *dev = cl->dev;
 213
 214         u32 msg_slots =
 215                 mei_data2slots(sizeof(struct hbm_client_connect_request));
 216
 217         if (*slots < msg_slots)
 218                 return -EMSGSIZE;
 219
 220         *slots -= msg_slots;
 221
 222         if (mei_hbm_cl_disconnect_req(dev, cl)) {
 223                 cl->status = 0;
 224                 cb->buf_idx = 0;
 225                 list_move_tail(&cb->list, &cmpl_list->list);
 226                 return -EIO;
 227         }
 228
 229         cl->state = MEI_FILE_DISCONNECTING;
 230         cl->status = 0;
 231         cb->buf_idx = 0;
 232         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
 233         cl->timer_count = MEI_CONNECT_TIMEOUT;
 234
 235         return 0;
 236 }
 237
 238
 239 /**
 240  * mei_cl_irq_close - processes client read related operation from the
 241  *      interrupt thread context - request for flow control credits
 242  *
 243  * @cl: client
 244  * @cb: callback block.
 245  * @slots: free slots.
 246  * @cmpl_list: complete list.
 247  *
 248  * returns 0, OK; otherwise, error.
 249  */
 250 static int mei_cl_irq_read(struct mei_cl *cl, struct mei_cl_cb *cb,
 251                            s32 *slots, struct mei_cl_cb *cmpl_list)
 252 {
 253         struct mei_device *dev = cl->dev;
 254         u32 msg_slots = mei_data2slots(sizeof(struct hbm_flow_control));
 255
 256         int ret;
 257
 258
 259         if (*slots < msg_slots) {
 260                 /* return the cancel routine */
 261                 list_del(&cb->list);
 262                 return -EMSGSIZE;
 263         }
 264
 265         *slots -= msg_slots;
 266
 267         ret = mei_hbm_cl_flow_control_req(dev, cl);
 268         if (ret) {
 269                 cl->status = ret;
 270                 cb->buf_idx = 0;
 271                 list_move_tail(&cb->list, &cmpl_list->list);
 272                 return ret;
 273         }
 274
 275         list_move_tail(&cb->list, &dev->read_list.list);
 276
 277         return 0;
 278 }
 279
 280
 281 /**
 282  * mei_cl_irq_connect - send connect request in irq_thread context
 283  *
 284  * @cl: client
 285  * @cb: callback block.
 286  * @slots: free slots.
 287  * @cmpl_list: complete list.
 288  *
 289  * returns 0, OK; otherwise, error.
 290  */
 291 static int mei_cl_irq_connect(struct mei_cl *cl, struct mei_cl_cb *cb,
 292                            s32 *slots, struct mei_cl_cb *cmpl_list)
 293 {
 294         struct mei_device *dev = cl->dev;
 295         int ret;
 296
 297         u32 msg_slots =
 298                 mei_data2slots(sizeof(struct hbm_client_connect_request));
 299
 300         if (mei_cl_is_other_connecting(cl))
 301                 return 0;
 302
 303         if (*slots < msg_slots) {
 304                 /* return the cancel routine */
 305                 list_del(&cb->list);
 306                 return -EMSGSIZE;
 307         }
 308
 309         *slots -=  msg_slots;
 310
 311         cl->state = MEI_FILE_CONNECTING;
 312
 313         ret = mei_hbm_cl_connect_req(dev, cl);
 314         if (ret) {
 315                 cl->status = ret;
 316                 cb->buf_idx = 0;
 317                 list_del(&cb->list);
 318                 return ret;
 319         }
 320
 321         list_move_tail(&cb->list, &dev->ctrl_rd_list.list);
 322         cl->timer_count = MEI_CONNECT_TIMEOUT;
 323         return 0;
 324 }
 325
 326
 327 /**
 328  * mei_irq_read_handler - bottom half read routine after ISR to
 329  * handle the read processing.
 330  *
 331  * @dev: the device structure
 332  * @cmpl_list: An instance of our list structure
 333  * @slots: slots to read.
 334  *
 335  * returns 0 on success, <0 on failure.
 336  */
 337 int mei_irq_read_handler(struct mei_device *dev,
 338                 struct mei_cl_cb *cmpl_list, s32 *slots)
 339 {
 340         struct mei_msg_hdr *mei_hdr;
 341         struct mei_cl *cl;
 342         int ret;
 343
 344         if (!dev->rd_msg_hdr) {
 345                 dev->rd_msg_hdr = mei_read_hdr(dev);
 346                 (*slots)--;
 347                 dev_dbg(&dev->pdev->dev, "slots =%08x.\n", *slots);
 348         }
 349         mei_hdr = (struct mei_msg_hdr *) &dev->rd_msg_hdr;
 350         dev_dbg(&dev->pdev->dev, MEI_HDR_FMT, MEI_HDR_PRM(mei_hdr));
 351
 352         if (mei_hdr->reserved || !dev->rd_msg_hdr) {
 353                 dev_err(&dev->pdev->dev, "corrupted message header 0x%08X\n",
 354                                 dev->rd_msg_hdr);
 355                 ret = -EBADMSG;
 356                 goto end;
 357         }
 358
 359         if (mei_slots2data(*slots) < mei_hdr->length) {
 360                 dev_err(&dev->pdev->dev, "less data available than length=%08x.\n",
 361                                 *slots);
 362                 /* we can't read the message */
 363                 ret = -ERANGE;
 364                 goto end;
 365         }
 366
 367         /*  HBM message */
 368         if (mei_hdr->host_addr == 0 && mei_hdr->me_addr == 0) {
 369                 ret = mei_hbm_dispatch(dev, mei_hdr);
 370                 if (ret) {
 371                         dev_dbg(&dev->pdev->dev, "mei_hbm_dispatch failed ret = %d\n",
 372                                         ret);
 373                         goto end;
 374                 }
 375                 goto reset_slots;
 376         }
 377
 378         /* find recipient cl */
 379         list_for_each_entry(cl, &dev->file_list, link) {
 380                 if (mei_cl_hbm_equal(cl, mei_hdr)) {
 381                         cl_dbg(dev, cl, "got a message\n");
 382                         break;
 383                 }
 384         }
 385
 386         /* if no recipient cl was found we assume corrupted header */
 387         if (&cl->link == &dev->file_list) {
 388                 dev_err(&dev->pdev->dev, "no destination client found 0x%08X\n",
 389                                 dev->rd_msg_hdr);
 390                 ret = -EBADMSG;
 391                 goto end;
 392         }
 393
 394         if (mei_hdr->host_addr == dev->iamthif_cl.host_client_id &&
 395             MEI_FILE_CONNECTED == dev->iamthif_cl.state &&
 396             dev->iamthif_state == MEI_IAMTHIF_READING) {
 397
 398                 ret = mei_amthif_irq_read_msg(dev, mei_hdr, cmpl_list);
 399                 if (ret) {
 400                         dev_err(&dev->pdev->dev, "mei_amthif_irq_read_msg failed = %d\n",
 401                                         ret);
 402                         goto end;
 403                 }
 404         } else {
 405                 ret = mei_cl_irq_read_msg(dev, mei_hdr, cmpl_list);
 406                 if (ret) {
 407                         dev_err(&dev->pdev->dev, "mei_cl_irq_read_msg failed = %d\n",
 408                                         ret);
 409                         goto end;
 410                 }
 411         }
 412
 413 reset_slots:
 414         /* reset the number of slots and header */
 415         *slots = mei_count_full_read_slots(dev);
 416         dev->rd_msg_hdr = 0;
 417
 418         if (*slots == -EOVERFLOW) {
 419                 /* overflow - reset */
 420                 dev_err(&dev->pdev->dev, "resetting due to slots overflow.\n");
 421                 /* set the event since message has been read */
 422                 ret = -ERANGE;
 423                 goto end;
 424         }
 425 end:
 426         return ret;
 427 }
 428 EXPORT_SYMBOL_GPL(mei_irq_read_handler);
 429
 430
 431 /**
 432  * mei_irq_write_handler -  dispatch write requests
 433  *  after irq received
 434  *
 435  * @dev: the device structure
 436  * @cmpl_list: An instance of our list structure
 437  *
 438  * returns 0 on success, <0 on failure.
 439  */
 440 int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list)
 441 {
 442
 443         struct mei_cl *cl;
 444         struct mei_cl_cb *cb, *next;
 445         struct mei_cl_cb *list;
 446         s32 slots;
 447         int ret;
 448
 449
 450         if (!mei_hbuf_acquire(dev))
 451                 return 0;
 452
 453         slots = mei_hbuf_empty_slots(dev);
 454         if (slots <= 0)
 455                 return -EMSGSIZE;
 456
 457         /* complete all waiting for write CB */
 458         dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");
 459
 460         list = &dev->write_waiting_list;
 461         list_for_each_entry_safe(cb, next, &list->list, list) {
 462                 cl = cb->cl;
 463                 if (cl == NULL)
 464                         continue;
 465
 466                 cl->status = 0;
 467                 list_del(&cb->list);
 468                 if (MEI_WRITING == cl->writing_state &&
 469                     cb->fop_type == MEI_FOP_WRITE &&
 470                     cl != &dev->iamthif_cl) {
 471                         cl_dbg(dev, cl, "MEI WRITE COMPLETE\n");
 472                         cl->writing_state = MEI_WRITE_COMPLETE;
 473                         list_add_tail(&cb->list, &cmpl_list->list);
 474                 }
 475                 if (cl == &dev->iamthif_cl) {
 476                         cl_dbg(dev, cl, "check iamthif flow control.\n");
 477                         if (dev->iamthif_flow_control_pending) {
 478                                 ret = mei_amthif_irq_read(dev, &slots);
 479                                 if (ret)
 480                                         return ret;
 481                         }
 482                 }
 483         }
 484
 485         if (dev->wd_state == MEI_WD_STOPPING) {
 486                 dev->wd_state = MEI_WD_IDLE;
 487                 wake_up_interruptible(&dev->wait_stop_wd);
 488         }
 489
 490         if (mei_cl_is_connected(&dev->wd_cl)) {
 491                 if (dev->wd_pending &&
 492                     mei_cl_flow_ctrl_creds(&dev->wd_cl) > 0) {
 493                         if (mei_wd_send(dev))
 494                                 dev_dbg(&dev->pdev->dev, "wd send failed.\n");
 495                         else if (mei_cl_flow_ctrl_reduce(&dev->wd_cl))
 496                                 return -ENODEV;
 497
 498                         dev->wd_pending = false;
 499
 500                         if (dev->wd_state == MEI_WD_RUNNING)
 501                                 slots -= mei_data2slots(MEI_WD_START_MSG_SIZE);
 502                         else
 503                                 slots -= mei_data2slots(MEI_WD_STOP_MSG_SIZE);
 504                 }
 505         }
 506
 507         /* complete control write list CB */
 508         dev_dbg(&dev->pdev->dev, "complete control write list cb.\n");
 509         list_for_each_entry_safe(cb, next, &dev->ctrl_wr_list.list, list) {
 510                 cl = cb->cl;
 511                 if (!cl) {
 512                         list_del(&cb->list);
 513                         return -ENODEV;
 514                 }
 515                 switch (cb->fop_type) {
 516                 case MEI_FOP_CLOSE:
 517                         /* send disconnect message */
 518                         ret = mei_cl_irq_close(cl, cb, &slots, cmpl_list);
 519                         if (ret)
 520                                 return ret;
 521
 522                         break;
 523                 case MEI_FOP_READ:
 524                         /* send flow control message */
 525                         ret = mei_cl_irq_read(cl, cb, &slots, cmpl_list);
 526                         if (ret)
 527                                 return ret;
 528
 529                         break;
 530                 case MEI_FOP_CONNECT:
 531                         /* connect message */
 532                         ret = mei_cl_irq_connect(cl, cb, &slots, cmpl_list);
 533                         if (ret)
 534                                 return ret;
 535
 536                         break;
 537                 case MEI_FOP_DISCONNECT_RSP:
 538                         /* send disconnect resp */
 539                         ret = mei_cl_irq_disconnect_rsp(cl, cb, &slots, cmpl_list);
 540                         if (ret)
 541                                 return ret;
 542                 default:
 543                         BUG();
 544                 }
 545
 546         }
 547         /* complete  write list CB */
 548         dev_dbg(&dev->pdev->dev, "complete write list cb.\n");
 549         list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
 550                 cl = cb->cl;
 551                 if (cl == NULL)
 552                         continue;
 553                 if (cl == &dev->iamthif_cl)
 554                         ret = mei_amthif_irq_write_complete(cl, cb,
 555                                                 &slots, cmpl_list);
 556                 else
 557                         ret = mei_cl_irq_write_complete(cl, cb,
 558                                                 &slots, cmpl_list);
 559                 if (ret)
 560                         return ret;
 561         }
 562         return 0;
 563 }
 564 EXPORT_SYMBOL_GPL(mei_irq_write_handler);
 565
 566
 567
 568 /**
 569  * mei_timer - timer function.
 570  *
 571  * @work: pointer to the work_struct structure
 572  *
 573  */
 574 void mei_timer(struct work_struct *work)
 575 {
 576         unsigned long timeout;
 577         struct mei_cl *cl;
 578         struct mei_cl_cb  *cb_pos = NULL;
 579         struct mei_cl_cb  *cb_next = NULL;
 580
 581         struct mei_device *dev = container_of(work,
 582                                         struct mei_device, timer_work.work);
 583
 584
 585         mutex_lock(&dev->device_lock);
 586
 587         /* Catch interrupt stalls during HBM init handshake */
 588         if (dev->dev_state == MEI_DEV_INIT_CLIENTS &&
 589             dev->hbm_state != MEI_HBM_IDLE) {
 590
 591                 if (dev->init_clients_timer) {
 592                         if (--dev->init_clients_timer == 0) {
 593                                 dev_err(&dev->pdev->dev, "timer: init clients timeout hbm_state = %d.\n",
 594                                         dev->hbm_state);
 595                                 mei_reset(dev);
 596                                 goto out;
 597                         }
 598                 }
 599         }
 600
 601         if (dev->dev_state != MEI_DEV_ENABLED)
 602                 goto out;
 603
 604         /*** connect/disconnect timeouts ***/
 605         list_for_each_entry(cl, &dev->file_list, link) {
 606                 if (cl->timer_count) {
 607                         if (--cl->timer_count == 0) {
 608                                 dev_err(&dev->pdev->dev, "timer: connect/disconnect timeout.\n");
 609                                 mei_reset(dev);
 610                                 goto out;
 611                         }
 612                 }
 613         }
 614
 615         if (!mei_cl_is_connected(&dev->iamthif_cl))
 616                 goto out;
 617
 618         if (dev->iamthif_stall_timer) {
 619                 if (--dev->iamthif_stall_timer == 0) {
 620                         dev_err(&dev->pdev->dev, "timer: amthif  hanged.\n");
 621                         mei_reset(dev);
 622                         dev->iamthif_msg_buf_size = 0;
 623                         dev->iamthif_msg_buf_index = 0;
 624                         dev->iamthif_canceled = false;
 625                         dev->iamthif_ioctl = true;
 626                         dev->iamthif_state = MEI_IAMTHIF_IDLE;
 627                         dev->iamthif_timer = 0;
 628
 629                         mei_io_cb_free(dev->iamthif_current_cb);
 630                         dev->iamthif_current_cb = NULL;
 631
 632                         dev->iamthif_file_object = NULL;
 633                         mei_amthif_run_next_cmd(dev);
 634                 }
 635         }
 636
 637         if (dev->iamthif_timer) {
 638
 639                 timeout = dev->iamthif_timer +
 640                         mei_secs_to_jiffies(MEI_IAMTHIF_READ_TIMER);
 641
 642                 dev_dbg(&dev->pdev->dev, "dev->iamthif_timer = %ld\n",
 643                                 dev->iamthif_timer);
 644                 dev_dbg(&dev->pdev->dev, "timeout = %ld\n", timeout);
 645                 dev_dbg(&dev->pdev->dev, "jiffies = %ld\n", jiffies);
 646                 if (time_after(jiffies, timeout)) {
 647                         /*
 648                          * User didn't read the AMTHI data on time (15sec)
 649                          * freeing AMTHI for other requests
 650                          */
 651
 652                         dev_dbg(&dev->pdev->dev, "freeing AMTHI for other requests\n");
 653
 654                         list_for_each_entry_safe(cb_pos, cb_next,
 655                                 &dev->amthif_rd_complete_list.list, list) {
 656
 657                                 cl = cb_pos->file_object->private_data;
 658
 659                                 /* Finding the AMTHI entry. */
 660                                 if (cl == &dev->iamthif_cl)
 661                                         list_del(&cb_pos->list);
 662                         }
 663                         mei_io_cb_free(dev->iamthif_current_cb);
 664                         dev->iamthif_current_cb = NULL;
 665
 666                         dev->iamthif_file_object->private_data = NULL;
 667                         dev->iamthif_file_object = NULL;
 668                         dev->iamthif_timer = 0;
 669                         mei_amthif_run_next_cmd(dev);
 670
 671                 }
 672         }
 673 out:
 674         if (dev->dev_state != MEI_DEV_DISABLED)
 675                 schedule_delayed_work(&dev->timer_work, 2 * HZ);
 676         mutex_unlock(&dev->device_lock);
 677 }
 678