Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * IEEE 1394 for Linux | |
3 | * | |
4 | * Transaction support. | |
5 | * | |
6 | * Copyright (C) 1999 Andreas E. Bombe | |
7 | * | |
8 | * This code is licensed under the GPL. See the file COPYING in the root | |
9 | * directory of the kernel sources for details. | |
10 | */ | |
11 | ||
1da177e4 | 12 | #include <linux/bitops.h> |
9543a931 | 13 | #include <linux/compiler.h> |
7fb9addb | 14 | #include <linux/hardirq.h> |
9951903e | 15 | #include <linux/spinlock.h> |
9543a931 | 16 | #include <linux/string.h> |
3a23a81e | 17 | #include <linux/sched.h> /* because linux/wait.h is broken if CONFIG_SMP=n */ |
9951903e | 18 | #include <linux/wait.h> |
1da177e4 | 19 | |
d83e7d8e | 20 | #include <asm/bug.h> |
1da177e4 | 21 | #include <asm/errno.h> |
9543a931 | 22 | #include <asm/system.h> |
1da177e4 LT |
23 | |
24 | #include "ieee1394.h" | |
25 | #include "ieee1394_types.h" | |
26 | #include "hosts.h" | |
27 | #include "ieee1394_core.h" | |
e27d3014 | 28 | #include "ieee1394_transactions.h" |
1da177e4 | 29 | |
1da177e4 LT |
30 | #define PREP_ASYNC_HEAD_ADDRESS(tc) \ |
31 | packet->tcode = tc; \ | |
32 | packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \ | |
33 | | (1 << 8) | (tc << 4); \ | |
34 | packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \ | |
35 | packet->header[2] = addr & 0xffffffff | |
36 | ||
9951903e SR |
37 | #ifndef HPSB_DEBUG_TLABELS |
38 | static | |
39 | #endif | |
df18ce85 | 40 | DEFINE_SPINLOCK(hpsb_tlabel_lock); |
9951903e SR |
41 | |
42 | static DECLARE_WAIT_QUEUE_HEAD(tlabel_wq); | |
43 | ||
1da177e4 LT |
44 | static void fill_async_readquad(struct hpsb_packet *packet, u64 addr) |
45 | { | |
16c333a3 JMH |
46 | PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ); |
47 | packet->header_size = 12; | |
48 | packet->data_size = 0; | |
49 | packet->expect_response = 1; | |
1da177e4 LT |
50 | } |
51 | ||
16c333a3 JMH |
52 | static void fill_async_readblock(struct hpsb_packet *packet, u64 addr, |
53 | int length) | |
1da177e4 | 54 | { |
16c333a3 JMH |
55 | PREP_ASYNC_HEAD_ADDRESS(TCODE_READB); |
56 | packet->header[3] = length << 16; | |
57 | packet->header_size = 16; | |
58 | packet->data_size = 0; | |
59 | packet->expect_response = 1; | |
1da177e4 LT |
60 | } |
61 | ||
16c333a3 JMH |
62 | static void fill_async_writequad(struct hpsb_packet *packet, u64 addr, |
63 | quadlet_t data) | |
1da177e4 | 64 | { |
16c333a3 JMH |
65 | PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ); |
66 | packet->header[3] = data; | |
67 | packet->header_size = 16; | |
68 | packet->data_size = 0; | |
69 | packet->expect_response = 1; | |
1da177e4 LT |
70 | } |
71 | ||
16c333a3 JMH |
72 | static void fill_async_writeblock(struct hpsb_packet *packet, u64 addr, |
73 | int length) | |
1da177e4 | 74 | { |
16c333a3 JMH |
75 | PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB); |
76 | packet->header[3] = length << 16; | |
77 | packet->header_size = 16; | |
78 | packet->expect_response = 1; | |
79 | packet->data_size = length + (length % 4 ? 4 - (length % 4) : 0); | |
1da177e4 LT |
80 | } |
81 | ||
82 | static void fill_async_lock(struct hpsb_packet *packet, u64 addr, int extcode, | |
16c333a3 | 83 | int length) |
1da177e4 | 84 | { |
16c333a3 JMH |
85 | PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST); |
86 | packet->header[3] = (length << 16) | extcode; | |
87 | packet->header_size = 16; | |
88 | packet->data_size = length; | |
89 | packet->expect_response = 1; | |
1da177e4 LT |
90 | } |
91 | ||
1da177e4 LT |
92 | static void fill_phy_packet(struct hpsb_packet *packet, quadlet_t data) |
93 | { | |
16c333a3 JMH |
94 | packet->header[0] = data; |
95 | packet->header[1] = ~data; | |
96 | packet->header_size = 8; | |
97 | packet->data_size = 0; | |
98 | packet->expect_response = 0; | |
99 | packet->type = hpsb_raw; /* No CRC added */ | |
100 | packet->speed_code = IEEE1394_SPEED_100; /* Force speed to be 100Mbps */ | |
1da177e4 LT |
101 | } |
102 | ||
103 | static void fill_async_stream_packet(struct hpsb_packet *packet, int length, | |
104 | int channel, int tag, int sync) | |
105 | { | |
106 | packet->header[0] = (length << 16) | (tag << 14) | (channel << 8) | |
16c333a3 | 107 | | (TCODE_STREAM_DATA << 4) | sync; |
1da177e4 LT |
108 | |
109 | packet->header_size = 4; | |
110 | packet->data_size = length; | |
111 | packet->type = hpsb_async; | |
112 | packet->tcode = TCODE_ISO_DATA; | |
113 | } | |
114 | ||
9951903e SR |
115 | /* same as hpsb_get_tlabel, except that it returns immediately */ |
116 | static int hpsb_get_tlabel_atomic(struct hpsb_packet *packet) | |
117 | { | |
118 | unsigned long flags, *tp; | |
119 | u8 *next; | |
120 | int tlabel, n = NODEID_TO_NODE(packet->node_id); | |
121 | ||
122 | /* Broadcast transactions are complete once the request has been sent. | |
123 | * Use the same transaction label for all broadcast transactions. */ | |
124 | if (unlikely(n == ALL_NODES)) { | |
125 | packet->tlabel = 0; | |
126 | return 0; | |
127 | } | |
128 | tp = packet->host->tl_pool[n].map; | |
129 | next = &packet->host->next_tl[n]; | |
130 | ||
131 | spin_lock_irqsave(&hpsb_tlabel_lock, flags); | |
132 | tlabel = find_next_zero_bit(tp, 64, *next); | |
133 | if (tlabel > 63) | |
134 | tlabel = find_first_zero_bit(tp, 64); | |
135 | if (tlabel > 63) { | |
136 | spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); | |
137 | return -EAGAIN; | |
138 | } | |
139 | __set_bit(tlabel, tp); | |
140 | *next = (tlabel + 1) & 63; | |
141 | spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); | |
142 | ||
143 | packet->tlabel = tlabel; | |
144 | return 0; | |
145 | } | |
146 | ||
1da177e4 LT |
147 | /** |
148 | * hpsb_get_tlabel - allocate a transaction label | |
9951903e | 149 | * @packet: the packet whose tlabel and tl_pool we set |
1da177e4 LT |
150 | * |
151 | * Every asynchronous transaction on the 1394 bus needs a transaction | |
152 | * label to match the response to the request. This label has to be | |
153 | * different from any other transaction label in an outstanding request to | |
154 | * the same node to make matching possible without ambiguity. | |
155 | * | |
156 | * There are 64 different tlabels, so an allocated tlabel has to be freed | |
157 | * with hpsb_free_tlabel() after the transaction is complete (unless it's | |
158 | * reused again for the same target node). | |
159 | * | |
160 | * Return value: Zero on success, otherwise non-zero. A non-zero return | |
161 | * generally means there are no available tlabels. If this is called out | |
162 | * of interrupt or atomic context, then it will sleep until can return a | |
9951903e | 163 | * tlabel or a signal is received. |
1da177e4 LT |
164 | */ |
165 | int hpsb_get_tlabel(struct hpsb_packet *packet) | |
166 | { | |
9951903e SR |
167 | if (irqs_disabled() || in_atomic()) |
168 | return hpsb_get_tlabel_atomic(packet); | |
169 | ||
170 | /* NB: The macro wait_event_interruptible() is called with a condition | |
171 | * argument with side effect. This is only possible because the side | |
172 | * effect does not occur until the condition became true, and | |
173 | * wait_event_interruptible() won't evaluate the condition again after | |
174 | * that. */ | |
175 | return wait_event_interruptible(tlabel_wq, | |
176 | !hpsb_get_tlabel_atomic(packet)); | |
1da177e4 LT |
177 | } |
178 | ||
179 | /** | |
180 | * hpsb_free_tlabel - free an allocated transaction label | |
9951903e | 181 | * @packet: packet whose tlabel and tl_pool needs to be cleared |
1da177e4 LT |
182 | * |
183 | * Frees the transaction label allocated with hpsb_get_tlabel(). The | |
184 | * tlabel has to be freed after the transaction is complete (i.e. response | |
185 | * was received for a split transaction or packet was sent for a unified | |
186 | * transaction). | |
187 | * | |
188 | * A tlabel must not be freed twice. | |
189 | */ | |
190 | void hpsb_free_tlabel(struct hpsb_packet *packet) | |
191 | { | |
9951903e SR |
192 | unsigned long flags, *tp; |
193 | int tlabel, n = NODEID_TO_NODE(packet->node_id); | |
1da177e4 | 194 | |
eaf88450 BC |
195 | if (unlikely(n == ALL_NODES)) |
196 | return; | |
9951903e SR |
197 | tp = packet->host->tl_pool[n].map; |
198 | tlabel = packet->tlabel; | |
199 | BUG_ON(tlabel > 63 || tlabel < 0); | |
1da177e4 | 200 | |
9951903e SR |
201 | spin_lock_irqsave(&hpsb_tlabel_lock, flags); |
202 | BUG_ON(!__test_and_clear_bit(tlabel, tp)); | |
203 | spin_unlock_irqrestore(&hpsb_tlabel_lock, flags); | |
1da177e4 | 204 | |
9951903e | 205 | wake_up_interruptible(&tlabel_wq); |
1da177e4 LT |
206 | } |
207 | ||
afd6546d SR |
208 | /** |
209 | * hpsb_packet_success - Make sense of the ack and reply codes | |
210 | * | |
211 | * Make sense of the ack and reply codes and return more convenient error codes: | |
212 | * 0 = success. -%EBUSY = node is busy, try again. -%EAGAIN = error which can | |
213 | * probably resolved by retry. -%EREMOTEIO = node suffers from an internal | |
214 | * error. -%EACCES = this transaction is not allowed on requested address. | |
215 | * -%EINVAL = invalid address at node. | |
216 | */ | |
1da177e4 LT |
217 | int hpsb_packet_success(struct hpsb_packet *packet) |
218 | { | |
16c333a3 JMH |
219 | switch (packet->ack_code) { |
220 | case ACK_PENDING: | |
221 | switch ((packet->header[1] >> 12) & 0xf) { | |
222 | case RCODE_COMPLETE: | |
223 | return 0; | |
224 | case RCODE_CONFLICT_ERROR: | |
225 | return -EAGAIN; | |
226 | case RCODE_DATA_ERROR: | |
227 | return -EREMOTEIO; | |
228 | case RCODE_TYPE_ERROR: | |
229 | return -EACCES; | |
230 | case RCODE_ADDRESS_ERROR: | |
231 | return -EINVAL; | |
232 | default: | |
233 | HPSB_ERR("received reserved rcode %d from node %d", | |
234 | (packet->header[1] >> 12) & 0xf, | |
235 | packet->node_id); | |
236 | return -EAGAIN; | |
237 | } | |
16c333a3 JMH |
238 | |
239 | case ACK_BUSY_X: | |
240 | case ACK_BUSY_A: | |
241 | case ACK_BUSY_B: | |
242 | return -EBUSY; | |
243 | ||
244 | case ACK_TYPE_ERROR: | |
245 | return -EACCES; | |
246 | ||
247 | case ACK_COMPLETE: | |
248 | if (packet->tcode == TCODE_WRITEQ | |
249 | || packet->tcode == TCODE_WRITEB) { | |
250 | return 0; | |
251 | } else { | |
252 | HPSB_ERR("impossible ack_complete from node %d " | |
253 | "(tcode %d)", packet->node_id, packet->tcode); | |
254 | return -EAGAIN; | |
255 | } | |
256 | ||
257 | case ACK_DATA_ERROR: | |
258 | if (packet->tcode == TCODE_WRITEB | |
259 | || packet->tcode == TCODE_LOCK_REQUEST) { | |
260 | return -EAGAIN; | |
261 | } else { | |
262 | HPSB_ERR("impossible ack_data_error from node %d " | |
263 | "(tcode %d)", packet->node_id, packet->tcode); | |
264 | return -EAGAIN; | |
265 | } | |
266 | ||
267 | case ACK_ADDRESS_ERROR: | |
268 | return -EINVAL; | |
269 | ||
270 | case ACK_TARDY: | |
271 | case ACK_CONFLICT_ERROR: | |
272 | case ACKX_NONE: | |
273 | case ACKX_SEND_ERROR: | |
274 | case ACKX_ABORTED: | |
275 | case ACKX_TIMEOUT: | |
276 | /* error while sending */ | |
277 | return -EAGAIN; | |
278 | ||
279 | default: | |
280 | HPSB_ERR("got invalid ack %d from node %d (tcode %d)", | |
281 | packet->ack_code, packet->node_id, packet->tcode); | |
282 | return -EAGAIN; | |
283 | } | |
1da177e4 LT |
284 | } |
285 | ||
286 | struct hpsb_packet *hpsb_make_readpacket(struct hpsb_host *host, nodeid_t node, | |
287 | u64 addr, size_t length) | |
288 | { | |
16c333a3 | 289 | struct hpsb_packet *packet; |
1da177e4 LT |
290 | |
291 | if (length == 0) | |
292 | return NULL; | |
293 | ||
294 | packet = hpsb_alloc_packet(length); | |
295 | if (!packet) | |
296 | return NULL; | |
297 | ||
298 | packet->host = host; | |
299 | packet->node_id = node; | |
300 | ||
301 | if (hpsb_get_tlabel(packet)) { | |
302 | hpsb_free_packet(packet); | |
303 | return NULL; | |
304 | } | |
305 | ||
306 | if (length == 4) | |
307 | fill_async_readquad(packet, addr); | |
308 | else | |
309 | fill_async_readblock(packet, addr, length); | |
310 | ||
311 | return packet; | |
312 | } | |
313 | ||
16c333a3 JMH |
314 | struct hpsb_packet *hpsb_make_writepacket(struct hpsb_host *host, nodeid_t node, |
315 | u64 addr, quadlet_t * buffer, | |
316 | size_t length) | |
1da177e4 LT |
317 | { |
318 | struct hpsb_packet *packet; | |
319 | ||
320 | if (length == 0) | |
321 | return NULL; | |
322 | ||
323 | packet = hpsb_alloc_packet(length); | |
324 | if (!packet) | |
325 | return NULL; | |
326 | ||
16c333a3 | 327 | if (length % 4) { /* zero padding bytes */ |
1da177e4 LT |
328 | packet->data[length >> 2] = 0; |
329 | } | |
330 | packet->host = host; | |
331 | packet->node_id = node; | |
332 | ||
333 | if (hpsb_get_tlabel(packet)) { | |
334 | hpsb_free_packet(packet); | |
335 | return NULL; | |
336 | } | |
337 | ||
338 | if (length == 4) { | |
339 | fill_async_writequad(packet, addr, buffer ? *buffer : 0); | |
340 | } else { | |
341 | fill_async_writeblock(packet, addr, length); | |
342 | if (buffer) | |
343 | memcpy(packet->data, buffer, length); | |
344 | } | |
345 | ||
346 | return packet; | |
347 | } | |
348 | ||
16c333a3 JMH |
349 | struct hpsb_packet *hpsb_make_streampacket(struct hpsb_host *host, u8 * buffer, |
350 | int length, int channel, int tag, | |
351 | int sync) | |
1da177e4 LT |
352 | { |
353 | struct hpsb_packet *packet; | |
354 | ||
355 | if (length == 0) | |
356 | return NULL; | |
357 | ||
358 | packet = hpsb_alloc_packet(length); | |
359 | if (!packet) | |
360 | return NULL; | |
361 | ||
16c333a3 | 362 | if (length % 4) { /* zero padding bytes */ |
1da177e4 LT |
363 | packet->data[length >> 2] = 0; |
364 | } | |
365 | packet->host = host; | |
366 | ||
ea9057ad SR |
367 | /* Because it is too difficult to determine all PHY speeds and link |
368 | * speeds here, we use S100... */ | |
369 | packet->speed_code = IEEE1394_SPEED_100; | |
370 | ||
371 | /* ...and prevent hpsb_send_packet() from overriding it. */ | |
372 | packet->node_id = LOCAL_BUS | ALL_NODES; | |
373 | ||
1da177e4 LT |
374 | if (hpsb_get_tlabel(packet)) { |
375 | hpsb_free_packet(packet); | |
376 | return NULL; | |
377 | } | |
378 | ||
379 | fill_async_stream_packet(packet, length, channel, tag, sync); | |
380 | if (buffer) | |
381 | memcpy(packet->data, buffer, length); | |
382 | ||
383 | return packet; | |
384 | } | |
385 | ||
386 | struct hpsb_packet *hpsb_make_lockpacket(struct hpsb_host *host, nodeid_t node, | |
16c333a3 JMH |
387 | u64 addr, int extcode, |
388 | quadlet_t * data, quadlet_t arg) | |
1da177e4 LT |
389 | { |
390 | struct hpsb_packet *p; | |
391 | u32 length; | |
392 | ||
393 | p = hpsb_alloc_packet(8); | |
16c333a3 JMH |
394 | if (!p) |
395 | return NULL; | |
1da177e4 LT |
396 | |
397 | p->host = host; | |
398 | p->node_id = node; | |
399 | if (hpsb_get_tlabel(p)) { | |
400 | hpsb_free_packet(p); | |
401 | return NULL; | |
402 | } | |
403 | ||
404 | switch (extcode) { | |
405 | case EXTCODE_FETCH_ADD: | |
406 | case EXTCODE_LITTLE_ADD: | |
407 | length = 4; | |
408 | if (data) | |
409 | p->data[0] = *data; | |
410 | break; | |
411 | default: | |
412 | length = 8; | |
413 | if (data) { | |
414 | p->data[0] = arg; | |
415 | p->data[1] = *data; | |
416 | } | |
417 | break; | |
418 | } | |
419 | fill_async_lock(p, addr, extcode, length); | |
420 | ||
421 | return p; | |
422 | } | |
423 | ||
16c333a3 JMH |
424 | struct hpsb_packet *hpsb_make_lock64packet(struct hpsb_host *host, |
425 | nodeid_t node, u64 addr, int extcode, | |
426 | octlet_t * data, octlet_t arg) | |
1da177e4 LT |
427 | { |
428 | struct hpsb_packet *p; | |
429 | u32 length; | |
430 | ||
431 | p = hpsb_alloc_packet(16); | |
16c333a3 JMH |
432 | if (!p) |
433 | return NULL; | |
1da177e4 LT |
434 | |
435 | p->host = host; | |
436 | p->node_id = node; | |
437 | if (hpsb_get_tlabel(p)) { | |
438 | hpsb_free_packet(p); | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | switch (extcode) { | |
443 | case EXTCODE_FETCH_ADD: | |
444 | case EXTCODE_LITTLE_ADD: | |
445 | length = 8; | |
446 | if (data) { | |
447 | p->data[0] = *data >> 32; | |
448 | p->data[1] = *data & 0xffffffff; | |
449 | } | |
450 | break; | |
451 | default: | |
452 | length = 16; | |
453 | if (data) { | |
454 | p->data[0] = arg >> 32; | |
455 | p->data[1] = arg & 0xffffffff; | |
456 | p->data[2] = *data >> 32; | |
457 | p->data[3] = *data & 0xffffffff; | |
458 | } | |
459 | break; | |
460 | } | |
461 | fill_async_lock(p, addr, extcode, length); | |
462 | ||
463 | return p; | |
464 | } | |
465 | ||
16c333a3 | 466 | struct hpsb_packet *hpsb_make_phypacket(struct hpsb_host *host, quadlet_t data) |
1da177e4 | 467 | { |
16c333a3 | 468 | struct hpsb_packet *p; |
1da177e4 | 469 | |
16c333a3 JMH |
470 | p = hpsb_alloc_packet(0); |
471 | if (!p) | |
472 | return NULL; | |
1da177e4 | 473 | |
16c333a3 JMH |
474 | p->host = host; |
475 | fill_phy_packet(p, data); | |
1da177e4 | 476 | |
16c333a3 | 477 | return p; |
1da177e4 LT |
478 | } |
479 | ||
1da177e4 LT |
480 | /* |
481 | * FIXME - these functions should probably read from / write to user space to | |
482 | * avoid in kernel buffers for user space callers | |
483 | */ | |
484 | ||
afd6546d SR |
485 | /** |
486 | * hpsb_read - generic read function | |
487 | * | |
488 | * Recognizes the local node ID and act accordingly. Automatically uses a | |
489 | * quadlet read request if @length == 4 and and a block read request otherwise. | |
490 | * It does not yet support lengths that are not a multiple of 4. | |
491 | * | |
492 | * You must explicitly specifiy the @generation for which the node ID is valid, | |
493 | * to avoid sending packets to the wrong nodes when we race with a bus reset. | |
494 | */ | |
1da177e4 | 495 | int hpsb_read(struct hpsb_host *host, nodeid_t node, unsigned int generation, |
16c333a3 | 496 | u64 addr, quadlet_t * buffer, size_t length) |
1da177e4 | 497 | { |
16c333a3 JMH |
498 | struct hpsb_packet *packet; |
499 | int retval = 0; | |
1da177e4 | 500 | |
16c333a3 JMH |
501 | if (length == 0) |
502 | return -EINVAL; | |
1da177e4 | 503 | |
16c333a3 | 504 | BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet |
1da177e4 LT |
505 | |
506 | packet = hpsb_make_readpacket(host, node, addr, length); | |
507 | ||
16c333a3 JMH |
508 | if (!packet) { |
509 | return -ENOMEM; | |
510 | } | |
1da177e4 LT |
511 | |
512 | packet->generation = generation; | |
16c333a3 | 513 | retval = hpsb_send_packet_and_wait(packet); |
1da177e4 LT |
514 | if (retval < 0) |
515 | goto hpsb_read_fail; | |
516 | ||
16c333a3 | 517 | retval = hpsb_packet_success(packet); |
1da177e4 | 518 | |
16c333a3 JMH |
519 | if (retval == 0) { |
520 | if (length == 4) { | |
521 | *buffer = packet->header[3]; | |
522 | } else { | |
523 | memcpy(buffer, packet->data, length); | |
524 | } | |
525 | } | |
1da177e4 | 526 | |
16c333a3 JMH |
527 | hpsb_read_fail: |
528 | hpsb_free_tlabel(packet); | |
529 | hpsb_free_packet(packet); | |
1da177e4 | 530 | |
16c333a3 | 531 | return retval; |
1da177e4 LT |
532 | } |
533 | ||
afd6546d SR |
534 | /** |
535 | * hpsb_write - generic write function | |
536 | * | |
537 | * Recognizes the local node ID and act accordingly. Automatically uses a | |
538 | * quadlet write request if @length == 4 and and a block write request | |
539 | * otherwise. It does not yet support lengths that are not a multiple of 4. | |
540 | * | |
541 | * You must explicitly specifiy the @generation for which the node ID is valid, | |
542 | * to avoid sending packets to the wrong nodes when we race with a bus reset. | |
543 | */ | |
1da177e4 | 544 | int hpsb_write(struct hpsb_host *host, nodeid_t node, unsigned int generation, |
16c333a3 | 545 | u64 addr, quadlet_t * buffer, size_t length) |
1da177e4 LT |
546 | { |
547 | struct hpsb_packet *packet; | |
548 | int retval; | |
549 | ||
550 | if (length == 0) | |
551 | return -EINVAL; | |
552 | ||
16c333a3 | 553 | BUG_ON(in_interrupt()); // We can't be called in an interrupt, yet |
1da177e4 | 554 | |
16c333a3 | 555 | packet = hpsb_make_writepacket(host, node, addr, buffer, length); |
1da177e4 LT |
556 | |
557 | if (!packet) | |
558 | return -ENOMEM; | |
559 | ||
560 | packet->generation = generation; | |
16c333a3 | 561 | retval = hpsb_send_packet_and_wait(packet); |
1da177e4 LT |
562 | if (retval < 0) |
563 | goto hpsb_write_fail; | |
564 | ||
16c333a3 | 565 | retval = hpsb_packet_success(packet); |
1da177e4 | 566 | |
16c333a3 JMH |
567 | hpsb_write_fail: |
568 | hpsb_free_tlabel(packet); | |
569 | hpsb_free_packet(packet); | |
1da177e4 | 570 | |
16c333a3 | 571 | return retval; |
1da177e4 | 572 | } |