blob: d1565828ae2c0104535ec008a16b70d21973f38f [file] [log] [blame]
Kristian Høgsbergc781c062007-05-07 20:33:32 -04001/*
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +01002 * Isochronous I/O functionality:
3 * - Isochronous DMA context management
4 * - Isochronous bus resource management (channels, bandwidth), client side
Kristian Høgsberg3038e352006-12-19 19:58:27 -05005 *
Kristian Høgsberg3038e352006-12-19 19:58:27 -05006 * Copyright (C) 2006 Kristian Hoegsberg <krh@bitplanet.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22
Kristian Høgsberg3038e352006-12-19 19:58:27 -050023#include <linux/dma-mapping.h>
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010024#include <linux/errno.h>
Stefan Richter77c9a5d2009-06-05 16:26:18 +020025#include <linux/firewire.h>
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010026#include <linux/firewire-constants.h>
27#include <linux/kernel.h>
Kristian Høgsberg3038e352006-12-19 19:58:27 -050028#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/slab.h>
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010030#include <linux/spinlock.h>
31#include <linux/vmalloc.h>
Paul Gortmaker823467e2011-07-10 12:16:32 -040032#include <linux/export.h>
Kristian Høgsberg3038e352006-12-19 19:58:27 -050033
Stefan Richtere8ca9702009-06-04 21:09:38 +020034#include <asm/byteorder.h>
35
Stefan Richter77c9a5d2009-06-05 16:26:18 +020036#include "core.h"
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +010037
38/*
39 * Isochronous DMA context management
40 */
Kristian Høgsberg3038e352006-12-19 19:58:27 -050041
Stefan Richter53dca512008-12-14 21:47:04 +010042int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
43 int page_count, enum dma_data_direction direction)
Kristian Høgsberg3038e352006-12-19 19:58:27 -050044{
Stefan Richter2dbd7d72008-12-14 21:45:45 +010045 int i, j;
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050046 dma_addr_t address;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050047
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050048 buffer->page_count = page_count;
49 buffer->direction = direction;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050050
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050051 buffer->pages = kmalloc(page_count * sizeof(buffer->pages[0]),
52 GFP_KERNEL);
53 if (buffer->pages == NULL)
54 goto out;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050055
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050056 for (i = 0; i < buffer->page_count; i++) {
Kristian Høgsberg68be3fa2007-02-16 17:34:48 -050057 buffer->pages[i] = alloc_page(GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050058 if (buffer->pages[i] == NULL)
59 goto out_pages;
Stefan Richter373b2ed2007-03-04 14:45:18 +010060
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050061 address = dma_map_page(card->device, buffer->pages[i],
62 0, PAGE_SIZE, direction);
FUJITA Tomonori8d8bb392008-07-25 19:44:49 -070063 if (dma_mapping_error(card->device, address)) {
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050064 __free_page(buffer->pages[i]);
65 goto out_pages;
66 }
67 set_page_private(buffer->pages[i], address);
Kristian Høgsberg3038e352006-12-19 19:58:27 -050068 }
69
70 return 0;
Kristian Høgsberg82eff9d2007-02-06 14:49:40 -050071
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050072 out_pages:
73 for (j = 0; j < i; j++) {
74 address = page_private(buffer->pages[j]);
75 dma_unmap_page(card->device, address,
Stefan Richter29ad14c2009-06-15 00:38:50 +020076 PAGE_SIZE, direction);
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050077 __free_page(buffer->pages[j]);
78 }
79 kfree(buffer->pages);
80 out:
81 buffer->pages = NULL;
Stefan Richtere1eff7a2009-02-03 17:55:19 +010082
Stefan Richter2dbd7d72008-12-14 21:45:45 +010083 return -ENOMEM;
Kristian Høgsberg3038e352006-12-19 19:58:27 -050084}
Jay Fenlasonc76acec2009-05-18 13:08:06 -040085EXPORT_SYMBOL(fw_iso_buffer_init);
Kristian Høgsberg3038e352006-12-19 19:58:27 -050086
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050087int fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma)
88{
89 unsigned long uaddr;
Stefan Richtere1eff7a2009-02-03 17:55:19 +010090 int i, err;
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050091
92 uaddr = vma->vm_start;
93 for (i = 0; i < buffer->page_count; i++) {
Stefan Richtere1eff7a2009-02-03 17:55:19 +010094 err = vm_insert_page(vma, uaddr, buffer->pages[i]);
95 if (err)
96 return err;
97
Kristian Høgsberg9aad8122007-02-16 17:34:38 -050098 uaddr += PAGE_SIZE;
99 }
100
101 return 0;
102}
103
104void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
105 struct fw_card *card)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500106{
107 int i;
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500108 dma_addr_t address;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500109
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500110 for (i = 0; i < buffer->page_count; i++) {
111 address = page_private(buffer->pages[i]);
112 dma_unmap_page(card->device, address,
Stefan Richter29ad14c2009-06-15 00:38:50 +0200113 PAGE_SIZE, buffer->direction);
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500114 __free_page(buffer->pages[i]);
115 }
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500116
Kristian Høgsberg9aad8122007-02-16 17:34:38 -0500117 kfree(buffer->pages);
118 buffer->pages = NULL;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500119}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400120EXPORT_SYMBOL(fw_iso_buffer_destroy);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500121
Stefan Richter872e3302010-07-29 18:19:22 +0200122/* Convert DMA address to offset into virtually contiguous buffer. */
123size_t fw_iso_buffer_lookup(struct fw_iso_buffer *buffer, dma_addr_t completed)
124{
125 int i;
126 dma_addr_t address;
127 ssize_t offset;
128
129 for (i = 0; i < buffer->page_count; i++) {
130 address = page_private(buffer->pages[i]);
131 offset = (ssize_t)completed - (ssize_t)address;
132 if (offset > 0 && offset <= PAGE_SIZE)
133 return (i << PAGE_SHIFT) + offset;
134 }
135
136 return 0;
137}
138
Stefan Richter53dca512008-12-14 21:47:04 +0100139struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
140 int type, int channel, int speed, size_t header_size,
141 fw_iso_callback_t callback, void *callback_data)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500142{
143 struct fw_iso_context *ctx;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500144
Stefan Richter4817ed22008-12-21 16:39:46 +0100145 ctx = card->driver->allocate_iso_context(card,
146 type, channel, header_size);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500147 if (IS_ERR(ctx))
148 return ctx;
149
150 ctx->card = card;
151 ctx->type = type;
Kristian Høgsberg21efb3c2007-02-16 17:34:50 -0500152 ctx->channel = channel;
153 ctx->speed = speed;
Kristian Høgsberg295e3fe2007-02-16 17:34:40 -0500154 ctx->header_size = header_size;
Stefan Richter872e3302010-07-29 18:19:22 +0200155 ctx->callback.sc = callback;
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500156 ctx->callback_data = callback_data;
157
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500158 return ctx;
159}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400160EXPORT_SYMBOL(fw_iso_context_create);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500161
162void fw_iso_context_destroy(struct fw_iso_context *ctx)
163{
Stefan Richter872e3302010-07-29 18:19:22 +0200164 ctx->card->driver->free_iso_context(ctx);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500165}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400166EXPORT_SYMBOL(fw_iso_context_destroy);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500167
Stefan Richter53dca512008-12-14 21:47:04 +0100168int fw_iso_context_start(struct fw_iso_context *ctx,
169 int cycle, int sync, int tags)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500170{
Kristian Høgsbergeb0306e2007-03-14 17:34:54 -0400171 return ctx->card->driver->start_iso(ctx, cycle, sync, tags);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500172}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400173EXPORT_SYMBOL(fw_iso_context_start);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500174
Stefan Richter872e3302010-07-29 18:19:22 +0200175int fw_iso_context_set_channels(struct fw_iso_context *ctx, u64 *channels)
176{
177 return ctx->card->driver->set_iso_channels(ctx, channels);
178}
179
Stefan Richter53dca512008-12-14 21:47:04 +0100180int fw_iso_context_queue(struct fw_iso_context *ctx,
181 struct fw_iso_packet *packet,
182 struct fw_iso_buffer *buffer,
183 unsigned long payload)
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500184{
Stefan Richter872e3302010-07-29 18:19:22 +0200185 return ctx->card->driver->queue_iso(ctx, packet, buffer, payload);
Kristian Høgsberg3038e352006-12-19 19:58:27 -0500186}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400187EXPORT_SYMBOL(fw_iso_context_queue);
Kristian Høgsbergb8295662007-02-16 17:34:42 -0500188
Clemens Ladisch13882a82011-05-02 09:33:56 +0200189void fw_iso_context_queue_flush(struct fw_iso_context *ctx)
190{
191 ctx->card->driver->flush_queue_iso(ctx);
192}
193EXPORT_SYMBOL(fw_iso_context_queue_flush);
194
Clemens Ladischd1bbd202012-03-18 19:06:39 +0100195int fw_iso_context_flush_completions(struct fw_iso_context *ctx)
196{
197 return ctx->card->driver->flush_iso_completions(ctx);
198}
199EXPORT_SYMBOL(fw_iso_context_flush_completions);
200
Stefan Richter53dca512008-12-14 21:47:04 +0100201int fw_iso_context_stop(struct fw_iso_context *ctx)
Kristian Høgsbergb8295662007-02-16 17:34:42 -0500202{
203 return ctx->card->driver->stop_iso(ctx);
204}
Jay Fenlasonc76acec2009-05-18 13:08:06 -0400205EXPORT_SYMBOL(fw_iso_context_stop);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100206
207/*
208 * Isochronous bus resource management (channels, bandwidth), client side
209 */
210
211static int manage_bandwidth(struct fw_card *card, int irm_id, int generation,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200212 int bandwidth, bool allocate)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100213{
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100214 int try, new, old = allocate ? BANDWIDTH_AVAILABLE_INITIAL : 0;
Stefan Richterf30e6d32011-04-22 15:13:54 +0200215 __be32 data[2];
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100216
217 /*
218 * On a 1394a IRM with low contention, try < 1 is enough.
219 * On a 1394-1995 IRM, we need at least try < 2.
220 * Let's just do try < 5.
221 */
222 for (try = 0; try < 5; try++) {
223 new = allocate ? old - bandwidth : old + bandwidth;
224 if (new < 0 || new > BANDWIDTH_AVAILABLE_INITIAL)
Clemens Ladischd6372b62010-04-12 10:35:18 +0200225 return -EBUSY;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100226
227 data[0] = cpu_to_be32(old);
228 data[1] = cpu_to_be32(new);
229 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
230 irm_id, generation, SCODE_100,
231 CSR_REGISTER_BASE + CSR_BANDWIDTH_AVAILABLE,
Stefan Richter1821bc12009-09-05 13:23:49 +0200232 data, 8)) {
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100233 case RCODE_GENERATION:
234 /* A generation change frees all bandwidth. */
235 return allocate ? -EAGAIN : bandwidth;
236
237 case RCODE_COMPLETE:
238 if (be32_to_cpup(data) == old)
239 return bandwidth;
240
241 old = be32_to_cpup(data);
242 /* Fall through. */
243 }
244 }
245
246 return -EIO;
247}
248
249static int manage_channel(struct fw_card *card, int irm_id, int generation,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200250 u32 channels_mask, u64 offset, bool allocate)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100251{
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100252 __be32 bit, all, old;
Stefan Richterf30e6d32011-04-22 15:13:54 +0200253 __be32 data[2];
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100254 int channel, ret = -EIO, retry = 5;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100255
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100256 old = all = allocate ? cpu_to_be32(~0) : 0;
257
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100258 for (channel = 0; channel < 32; channel++) {
259 if (!(channels_mask & 1 << channel))
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100260 continue;
261
Clemens Ladischd6372b62010-04-12 10:35:18 +0200262 ret = -EBUSY;
263
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100264 bit = cpu_to_be32(1 << (31 - channel));
265 if ((old & bit) != (all & bit))
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100266 continue;
267
268 data[0] = old;
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100269 data[1] = old ^ bit;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100270 switch (fw_run_transaction(card, TCODE_LOCK_COMPARE_SWAP,
271 irm_id, generation, SCODE_100,
Stefan Richter1821bc12009-09-05 13:23:49 +0200272 offset, data, 8)) {
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100273 case RCODE_GENERATION:
274 /* A generation change frees all channels. */
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100275 return allocate ? -EAGAIN : channel;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100276
277 case RCODE_COMPLETE:
278 if (data[0] == old)
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100279 return channel;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100280
281 old = data[0];
282
283 /* Is the IRM 1394a-2000 compliant? */
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100284 if ((data[0] & bit) == (data[1] & bit))
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100285 continue;
286
287 /* 1394-1995 IRM, fall through to retry. */
288 default:
Clemens Ladisch3a1f0a02010-04-12 10:35:05 +0200289 if (retry) {
290 retry--;
Clemens Ladisch5aaffc62011-01-31 11:58:58 +0100291 channel--;
Clemens Ladischd6372b62010-04-12 10:35:18 +0200292 } else {
293 ret = -EIO;
Clemens Ladisch3a1f0a02010-04-12 10:35:05 +0200294 }
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100295 }
296 }
297
Clemens Ladischd6372b62010-04-12 10:35:18 +0200298 return ret;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100299}
300
301static void deallocate_channel(struct fw_card *card, int irm_id,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200302 int generation, int channel)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100303{
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100304 u32 mask;
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100305 u64 offset;
306
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100307 mask = channel < 32 ? 1 << channel : 1 << (channel - 32);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100308 offset = channel < 32 ? CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI :
309 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO;
310
Stefan Richterf30e6d32011-04-22 15:13:54 +0200311 manage_channel(card, irm_id, generation, mask, offset, false);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100312}
313
314/**
Stefan Richter656b7af2010-07-07 13:26:18 +0200315 * fw_iso_resource_manage() - Allocate or deallocate a channel and/or bandwidth
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100316 *
317 * In parameters: card, generation, channels_mask, bandwidth, allocate
318 * Out parameters: channel, bandwidth
319 * This function blocks (sleeps) during communication with the IRM.
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100320 *
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100321 * Allocates or deallocates at most one channel out of channels_mask.
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100322 * channels_mask is a bitfield with MSB for channel 63 and LSB for channel 0.
323 * (Note, the IRM's CHANNELS_AVAILABLE is a big-endian bitfield with MSB for
324 * channel 0 and LSB for channel 63.)
325 * Allocates or deallocates as many bandwidth allocation units as specified.
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100326 *
327 * Returns channel < 0 if no channel was allocated or deallocated.
328 * Returns bandwidth = 0 if no bandwidth was allocated or deallocated.
329 *
330 * If generation is stale, deallocations succeed but allocations fail with
331 * channel = -EAGAIN.
332 *
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100333 * If channel allocation fails, no bandwidth will be allocated either.
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100334 * If bandwidth allocation fails, no channel will be allocated either.
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100335 * But deallocations of channel and bandwidth are tried independently
336 * of each other's success.
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100337 */
338void fw_iso_resource_manage(struct fw_card *card, int generation,
339 u64 channels_mask, int *channel, int *bandwidth,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200340 bool allocate)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100341{
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100342 u32 channels_hi = channels_mask; /* channels 31...0 */
343 u32 channels_lo = channels_mask >> 32; /* channels 63...32 */
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100344 int irm_id, ret, c = -EINVAL;
345
346 spin_lock_irq(&card->lock);
347 irm_id = card->irm_node->node_id;
348 spin_unlock_irq(&card->lock);
349
350 if (channels_hi)
351 c = manage_channel(card, irm_id, generation, channels_hi,
Stefan Richter6fdc0372009-06-20 13:23:59 +0200352 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_HI,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200353 allocate);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100354 if (channels_lo && c < 0) {
355 c = manage_channel(card, irm_id, generation, channels_lo,
Stefan Richter6fdc0372009-06-20 13:23:59 +0200356 CSR_REGISTER_BASE + CSR_CHANNELS_AVAILABLE_LO,
Stefan Richterf30e6d32011-04-22 15:13:54 +0200357 allocate);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100358 if (c >= 0)
359 c += 32;
360 }
361 *channel = c;
362
Stefan Richter5d9cb7d2009-01-08 23:07:40 +0100363 if (allocate && channels_mask != 0 && c < 0)
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100364 *bandwidth = 0;
365
366 if (*bandwidth == 0)
367 return;
368
Stefan Richterf30e6d32011-04-22 15:13:54 +0200369 ret = manage_bandwidth(card, irm_id, generation, *bandwidth, allocate);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100370 if (ret < 0)
371 *bandwidth = 0;
372
Clemens Ladischcf36df62010-03-15 13:20:32 +0100373 if (allocate && ret < 0) {
374 if (c >= 0)
Stefan Richterf30e6d32011-04-22 15:13:54 +0200375 deallocate_channel(card, irm_id, generation, c);
Jay Fenlason, Stefan Richterb1bda4c2009-01-04 16:23:29 +0100376 *channel = ret;
377 }
378}
Clemens Ladisch31ef9132011-03-15 07:53:21 +0100379EXPORT_SYMBOL(fw_iso_resource_manage);