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[hh.org.git] / drivers / pci / hotplug / shpchp_ctrl.c
blobc39901dbff202ee46cb04096e639060088e017f9
1 /*
2 * Standard Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/types.h>
33 #include <linux/smp_lock.h>
34 #include <linux/pci.h>
35 #include <linux/workqueue.h>
36 #include "../pci.h"
37 #include "shpchp.h"
38
39 static void interrupt_event_handler(void *data);
40 static int shpchp_enable_slot(struct slot *p_slot);
41 static int shpchp_disable_slot(struct slot *p_slot);
42
43 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
44 {
45 struct event_info *info;
46
47 info = kmalloc(sizeof(*info), GFP_ATOMIC);
48 if (!info)
49 return -ENOMEM;
50
51 info->event_type = event_type;
52 info->p_slot = p_slot;
53 INIT_WORK(&info->work, interrupt_event_handler, info);
54
55 schedule_work(&info->work);
56
57 return 0;
58 }
59
60 u8 shpchp_handle_attention_button(u8 hp_slot, void *inst_id)
61 {
62 struct controller *ctrl = (struct controller *) inst_id;
63 struct slot *p_slot;
64 u32 event_type;
65
66 /* Attention Button Change */
67 dbg("shpchp: Attention button interrupt received.\n");
68
69 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
70 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
71
72 /*
73 * Button pressed - See if need to TAKE ACTION!!!
74 */
75 info("Button pressed on Slot(%s)\n", p_slot->name);
76 event_type = INT_BUTTON_PRESS;
77
78 queue_interrupt_event(p_slot, event_type);
79
80 return 0;
81
82 }
83
84 u8 shpchp_handle_switch_change(u8 hp_slot, void *inst_id)
85 {
86 struct controller *ctrl = (struct controller *) inst_id;
87 struct slot *p_slot;
88 u8 getstatus;
89 u32 event_type;
90
91 /* Switch Change */
92 dbg("shpchp: Switch interrupt received.\n");
93
94 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
95 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
96 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
97 dbg("%s: Card present %x Power status %x\n", __FUNCTION__,
98 p_slot->presence_save, p_slot->pwr_save);
99
100 if (getstatus) {
101 /*
102 * Switch opened
103 */
104 info("Latch open on Slot(%s)\n", p_slot->name);
105 event_type = INT_SWITCH_OPEN;
106 if (p_slot->pwr_save && p_slot->presence_save) {
107 event_type = INT_POWER_FAULT;
108 err("Surprise Removal of card\n");
109 }
110 } else {
111 /*
112 * Switch closed
113 */
114 info("Latch close on Slot(%s)\n", p_slot->name);
115 event_type = INT_SWITCH_CLOSE;
116 }
117
118 queue_interrupt_event(p_slot, event_type);
119
120 return 1;
121 }
122
123 u8 shpchp_handle_presence_change(u8 hp_slot, void *inst_id)
124 {
125 struct controller *ctrl = (struct controller *) inst_id;
126 struct slot *p_slot;
127 u32 event_type;
128
129 /* Presence Change */
130 dbg("shpchp: Presence/Notify input change.\n");
131
132 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
133
134 /*
135 * Save the presence state
136 */
137 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
138 if (p_slot->presence_save) {
139 /*
140 * Card Present
141 */
142 info("Card present on Slot(%s)\n", p_slot->name);
143 event_type = INT_PRESENCE_ON;
144 } else {
145 /*
146 * Not Present
147 */
148 info("Card not present on Slot(%s)\n", p_slot->name);
149 event_type = INT_PRESENCE_OFF;
150 }
151
152 queue_interrupt_event(p_slot, event_type);
153
154 return 1;
155 }
156
157 u8 shpchp_handle_power_fault(u8 hp_slot, void *inst_id)
158 {
159 struct controller *ctrl = (struct controller *) inst_id;
160 struct slot *p_slot;
161 u32 event_type;
162
163 /* Power fault */
164 dbg("shpchp: Power fault interrupt received.\n");
165
166 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
167
168 if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) {
169 /*
170 * Power fault Cleared
171 */
172 info("Power fault cleared on Slot(%s)\n", p_slot->name);
173 p_slot->status = 0x00;
174 event_type = INT_POWER_FAULT_CLEAR;
175 } else {
176 /*
177 * Power fault
178 */
179 info("Power fault on Slot(%s)\n", p_slot->name);
180 event_type = INT_POWER_FAULT;
181 /* set power fault status for this board */
182 p_slot->status = 0xFF;
183 info("power fault bit %x set\n", hp_slot);
184 }
185
186 queue_interrupt_event(p_slot, event_type);
187
188 return 1;
189 }
190
191 /* The following routines constitute the bulk of the
192 hotplug controller logic
193 */
194 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
195 enum pci_bus_speed speed)
196 {
197 int rc = 0;
198
199 dbg("%s: change to speed %d\n", __FUNCTION__, speed);
200 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed))) {
201 err("%s: Issue of set bus speed mode command failed\n",
202 __FUNCTION__);
203 return WRONG_BUS_FREQUENCY;
204 }
205 return rc;
206 }
207
208 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
209 u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
210 enum pci_bus_speed msp)
211 {
212 int rc = 0;
213
214 /*
215 * If other slots on the same bus are occupied, we cannot
216 * change the bus speed.
217 */
218 if (flag) {
219 if (asp < bsp) {
220 err("%s: speed of bus %x and adapter %x mismatch\n",
221 __FUNCTION__, bsp, asp);
222 rc = WRONG_BUS_FREQUENCY;
223 }
224 return rc;
225 }
226
227 if (asp < msp) {
228 if (bsp != asp)
229 rc = change_bus_speed(ctrl, pslot, asp);
230 } else {
231 if (bsp != msp)
232 rc = change_bus_speed(ctrl, pslot, msp);
233 }
234 return rc;
235 }
236
237 /**
238 * board_added - Called after a board has been added to the system.
239 *
240 * Turns power on for the board
241 * Configures board
242 *
243 */
244 static int board_added(struct slot *p_slot)
245 {
246 u8 hp_slot;
247 u8 slots_not_empty = 0;
248 int rc = 0;
249 enum pci_bus_speed asp, bsp, msp;
250 struct controller *ctrl = p_slot->ctrl;
251
252 hp_slot = p_slot->device - ctrl->slot_device_offset;
253
254 dbg("%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
255 __FUNCTION__, p_slot->device,
256 ctrl->slot_device_offset, hp_slot);
257
258 /* Power on slot without connecting to bus */
259 rc = p_slot->hpc_ops->power_on_slot(p_slot);
260 if (rc) {
261 err("%s: Failed to power on slot\n", __FUNCTION__);
262 return -1;
263 }
264
265 if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
266 if (slots_not_empty)
267 return WRONG_BUS_FREQUENCY;
268
269 if ((rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz))) {
270 err("%s: Issue of set bus speed mode command failed\n", __FUNCTION__);
271 return WRONG_BUS_FREQUENCY;
272 }
273
274 /* turn on board, blink green LED, turn off Amber LED */
275 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
276 err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
277 return rc;
278 }
279 }
280
281 rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
282 if (rc) {
283 err("%s: Can't get adapter speed or bus mode mismatch\n",
284 __FUNCTION__);
285 return WRONG_BUS_FREQUENCY;
286 }
287
288 rc = p_slot->hpc_ops->get_cur_bus_speed(p_slot, &bsp);
289 if (rc) {
290 err("%s: Can't get bus operation speed\n", __FUNCTION__);
291 return WRONG_BUS_FREQUENCY;
292 }
293
294 rc = p_slot->hpc_ops->get_max_bus_speed(p_slot, &msp);
295 if (rc) {
296 err("%s: Can't get max bus operation speed\n", __FUNCTION__);
297 msp = bsp;
298 }
299
300 /* Check if there are other slots or devices on the same bus */
301 if (!list_empty(&ctrl->pci_dev->subordinate->devices))
302 slots_not_empty = 1;
303
304 dbg("%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, "
305 "max_bus_speed %d\n", __FUNCTION__, slots_not_empty, asp,
306 bsp, msp);
307
308 rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
309 if (rc)
310 return rc;
311
312 /* turn on board, blink green LED, turn off Amber LED */
313 if ((rc = p_slot->hpc_ops->slot_enable(p_slot))) {
314 err("%s: Issue of Slot Enable command failed\n", __FUNCTION__);
315 return rc;
316 }
317
318 /* Wait for ~1 second */
319 msleep(1000);
320
321 dbg("%s: slot status = %x\n", __FUNCTION__, p_slot->status);
322 /* Check for a power fault */
323 if (p_slot->status == 0xFF) {
324 /* power fault occurred, but it was benign */
325 dbg("%s: power fault\n", __FUNCTION__);
326 rc = POWER_FAILURE;
327 p_slot->status = 0;
328 goto err_exit;
329 }
330
331 if (shpchp_configure_device(p_slot)) {
332 err("Cannot add device at 0x%x:0x%x\n", p_slot->bus,
333 p_slot->device);
334 goto err_exit;
335 }
336
337 p_slot->status = 0;
338 p_slot->is_a_board = 0x01;
339 p_slot->pwr_save = 1;
340
341 p_slot->hpc_ops->green_led_on(p_slot);
342
343 return 0;
344
345 err_exit:
346 /* turn off slot, turn on Amber LED, turn off Green LED */
347 rc = p_slot->hpc_ops->slot_disable(p_slot);
348 if (rc) {
349 err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
350 return rc;
351 }
352
353 return(rc);
354 }
355
356
357 /**
358 * remove_board - Turns off slot and LED's
359 *
360 */
361 static int remove_board(struct slot *p_slot)
362 {
363 struct controller *ctrl = p_slot->ctrl;
364 u8 hp_slot;
365 int rc;
366
367 if (shpchp_unconfigure_device(p_slot))
368 return(1);
369
370 hp_slot = p_slot->device - ctrl->slot_device_offset;
371 p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
372
373 dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot);
374
375 /* Change status to shutdown */
376 if (p_slot->is_a_board)
377 p_slot->status = 0x01;
378
379 /* turn off slot, turn on Amber LED, turn off Green LED */
380 rc = p_slot->hpc_ops->slot_disable(p_slot);
381 if (rc) {
382 err("%s: Issue of Slot Disable command failed\n", __FUNCTION__);
383 return rc;
384 }
385
386 rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
387 if (rc) {
388 err("%s: Issue of Set Attention command failed\n", __FUNCTION__);
389 return rc;
390 }
391
392 p_slot->pwr_save = 0;
393 p_slot->is_a_board = 0;
394
395 return 0;
396 }
397
398
399 struct pushbutton_work_info {
400 struct slot *p_slot;
401 struct work_struct work;
402 };
403
404 /**
405 * shpchp_pushbutton_thread
406 *
407 * Scheduled procedure to handle blocking stuff for the pushbuttons
408 * Handles all pending events and exits.
409 *
410 */
411 static void shpchp_pushbutton_thread(void *data)
412 {
413 struct pushbutton_work_info *info = data;
414 struct slot *p_slot = info->p_slot;
415
416 mutex_lock(&p_slot->lock);
417 switch (p_slot->state) {
418 case POWEROFF_STATE:
419 mutex_unlock(&p_slot->lock);
420 shpchp_disable_slot(p_slot);
421 mutex_lock(&p_slot->lock);
422 p_slot->state = STATIC_STATE;
423 break;
424 case POWERON_STATE:
425 mutex_unlock(&p_slot->lock);
426 if (shpchp_enable_slot(p_slot))
427 p_slot->hpc_ops->green_led_off(p_slot);
428 mutex_lock(&p_slot->lock);
429 p_slot->state = STATIC_STATE;
430 break;
431 default:
432 break;
433 }
434 mutex_unlock(&p_slot->lock);
435
436 kfree(info);
437 }
438
439 void queue_pushbutton_work(void *data)
440 {
441 struct slot *p_slot = data;
442 struct pushbutton_work_info *info;
443
444 info = kmalloc(sizeof(*info), GFP_KERNEL);
445 if (!info) {
446 err("%s: Cannot allocate memory\n", __FUNCTION__);
447 return;
448 }
449 info->p_slot = p_slot;
450 INIT_WORK(&info->work, shpchp_pushbutton_thread, info);
451
452 mutex_lock(&p_slot->lock);
453 switch (p_slot->state) {
454 case BLINKINGOFF_STATE:
455 p_slot->state = POWEROFF_STATE;
456 break;
457 case BLINKINGON_STATE:
458 p_slot->state = POWERON_STATE;
459 break;
460 default:
461 goto out;
462 }
463 queue_work(shpchp_wq, &info->work);
464 out:
465 mutex_unlock(&p_slot->lock);
466 }
467
468 static int update_slot_info (struct slot *slot)
469 {
470 struct hotplug_slot_info *info;
471 int result;
472
473 info = kmalloc(sizeof(*info), GFP_KERNEL);
474 if (!info)
475 return -ENOMEM;
476
477 slot->hpc_ops->get_power_status(slot, &(info->power_status));
478 slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
479 slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
480 slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
481
482 result = pci_hp_change_slot_info(slot->hotplug_slot, info);
483 kfree (info);
484 return result;
485 }
486
487 /*
488 * Note: This function must be called with slot->lock held
489 */
490 static void handle_button_press_event(struct slot *p_slot)
491 {
492 u8 getstatus;
493
494 switch (p_slot->state) {
495 case STATIC_STATE:
496 p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
497 if (getstatus) {
498 p_slot->state = BLINKINGOFF_STATE;
499 info(msg_button_off, p_slot->name);
500 } else {
501 p_slot->state = BLINKINGON_STATE;
502 info(msg_button_on, p_slot->name);
503 }
504 /* blink green LED and turn off amber */
505 p_slot->hpc_ops->green_led_blink(p_slot);
506 p_slot->hpc_ops->set_attention_status(p_slot, 0);
507
508 schedule_delayed_work(&p_slot->work, 5*HZ);
509 break;
510 case BLINKINGOFF_STATE:
511 case BLINKINGON_STATE:
512 /*
513 * Cancel if we are still blinking; this means that we
514 * press the attention again before the 5 sec. limit
515 * expires to cancel hot-add or hot-remove
516 */
517 info("Button cancel on Slot(%s)\n", p_slot->name);
518 dbg("%s: button cancel\n", __FUNCTION__);
519 cancel_delayed_work(&p_slot->work);
520 if (p_slot->state == BLINKINGOFF_STATE)
521 p_slot->hpc_ops->green_led_on(p_slot);
522 else
523 p_slot->hpc_ops->green_led_off(p_slot);
524 p_slot->hpc_ops->set_attention_status(p_slot, 0);
525 info(msg_button_cancel, p_slot->name);
526 p_slot->state = STATIC_STATE;
527 break;
528 case POWEROFF_STATE:
529 case POWERON_STATE:
530 /*
531 * Ignore if the slot is on power-on or power-off state;
532 * this means that the previous attention button action
533 * to hot-add or hot-remove is undergoing
534 */
535 info("Button ignore on Slot(%s)\n", p_slot->name);
536 update_slot_info(p_slot);
537 break;
538 default:
539 warn("Not a valid state\n");
540 break;
541 }
542 }
543
544 static void interrupt_event_handler(void *data)
545 {
546 struct event_info *info = data;
547 struct slot *p_slot = info->p_slot;
548
549 mutex_lock(&p_slot->lock);
550 switch (info->event_type) {
551 case INT_BUTTON_PRESS:
552 handle_button_press_event(p_slot);
553 break;
554 case INT_POWER_FAULT:
555 dbg("%s: power fault\n", __FUNCTION__);
556 p_slot->hpc_ops->set_attention_status(p_slot, 1);
557 p_slot->hpc_ops->green_led_off(p_slot);
558 break;
559 default:
560 update_slot_info(p_slot);
561 break;
562 }
563 mutex_unlock(&p_slot->lock);
564
565 kfree(info);
566 }
567
568
569 static int shpchp_enable_slot (struct slot *p_slot)
570 {
571 u8 getstatus = 0;
572 int rc, retval = -ENODEV;
573
574 /* Check to see if (latch closed, card present, power off) */
575 mutex_lock(&p_slot->ctrl->crit_sect);
576 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
577 if (rc || !getstatus) {
578 info("No adapter on slot(%s)\n", p_slot->name);
579 goto out;
580 }
581 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
582 if (rc || getstatus) {
583 info("Latch open on slot(%s)\n", p_slot->name);
584 goto out;
585 }
586 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
587 if (rc || getstatus) {
588 info("Already enabled on slot(%s)\n", p_slot->name);
589 goto out;
590 }
591
592 p_slot->is_a_board = 1;
593
594 /* We have to save the presence info for these slots */
595 p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
596 p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
597 dbg("%s: p_slot->pwr_save %x\n", __FUNCTION__, p_slot->pwr_save);
598 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
599
600 if(((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD) ||
601 (p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458))
602 && p_slot->ctrl->num_slots == 1) {
603 /* handle amd pogo errata; this must be done before enable */
604 amd_pogo_errata_save_misc_reg(p_slot);
605 retval = board_added(p_slot);
606 /* handle amd pogo errata; this must be done after enable */
607 amd_pogo_errata_restore_misc_reg(p_slot);
608 } else
609 retval = board_added(p_slot);
610
611 if (retval) {
612 p_slot->hpc_ops->get_adapter_status(p_slot,
613 &(p_slot->presence_save));
614 p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
615 }
616
617 update_slot_info(p_slot);
618 out:
619 mutex_unlock(&p_slot->ctrl->crit_sect);
620 return retval;
621 }
622
623
624 static int shpchp_disable_slot (struct slot *p_slot)
625 {
626 u8 getstatus = 0;
627 int rc, retval = -ENODEV;
628
629 if (!p_slot->ctrl)
630 return -ENODEV;
631
632 /* Check to see if (latch closed, card present, power on) */
633 mutex_lock(&p_slot->ctrl->crit_sect);
634
635 rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
636 if (rc || !getstatus) {
637 info("No adapter on slot(%s)\n", p_slot->name);
638 goto out;
639 }
640 rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
641 if (rc || getstatus) {
642 info("Latch open on slot(%s)\n", p_slot->name);
643 goto out;
644 }
645 rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
646 if (rc || !getstatus) {
647 info("Already disabled slot(%s)\n", p_slot->name);
648 goto out;
649 }
650
651 retval = remove_board(p_slot);
652 update_slot_info(p_slot);
653 out:
654 mutex_unlock(&p_slot->ctrl->crit_sect);
655 return retval;
656 }
657
658 int shpchp_sysfs_enable_slot(struct slot *p_slot)
659 {
660 int retval = -ENODEV;
661
662 mutex_lock(&p_slot->lock);
663 switch (p_slot->state) {
664 case BLINKINGON_STATE:
665 cancel_delayed_work(&p_slot->work);
666 case STATIC_STATE:
667 p_slot->state = POWERON_STATE;
668 mutex_unlock(&p_slot->lock);
669 retval = shpchp_enable_slot(p_slot);
670 mutex_lock(&p_slot->lock);
671 p_slot->state = STATIC_STATE;
672 break;
673 case POWERON_STATE:
674 info("Slot %s is already in powering on state\n",
675 p_slot->name);
676 break;
677 case BLINKINGOFF_STATE:
678 case POWEROFF_STATE:
679 info("Already enabled on slot %s\n", p_slot->name);
680 break;
681 default:
682 err("Not a valid state on slot %s\n", p_slot->name);
683 break;
684 }
685 mutex_unlock(&p_slot->lock);
686
687 return retval;
688 }
689
690 int shpchp_sysfs_disable_slot(struct slot *p_slot)
691 {
692 int retval = -ENODEV;
693
694 mutex_lock(&p_slot->lock);
695 switch (p_slot->state) {
696 case BLINKINGOFF_STATE:
697 cancel_delayed_work(&p_slot->work);
698 case STATIC_STATE:
699 p_slot->state = POWEROFF_STATE;
700 mutex_unlock(&p_slot->lock);
701 retval = shpchp_disable_slot(p_slot);
702 mutex_lock(&p_slot->lock);
703 p_slot->state = STATIC_STATE;
704 break;
705 case POWEROFF_STATE:
706 info("Slot %s is already in powering off state\n",
707 p_slot->name);
708 break;
709 case BLINKINGON_STATE:
710 case POWERON_STATE:
711 info("Already disabled on slot %s\n", p_slot->name);
712 break;
713 default:
714 err("Not a valid state on slot %s\n", p_slot->name);
715 break;
716 }
717 mutex_unlock(&p_slot->lock);
718
719 return retval;
720 }
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