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authorCorey Minyard <minyard@acm.org>2009-04-21 15:24:03 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-21 16:41:48 -0400
commit40112ae7504745799e75ef418057f0d2cb745050 (patch)
treef40db99519d3567e74fa699ff78a3e637df3dc2c /drivers/char
parent8b32b5d0dca2f5ab632e8bedcd57fe4c109c13fe (diff)
ipmi: test for event buffer before using
The IPMI driver would attempt to use the event buffer even if that didn't exist on the BMC. This patch modified the IPMI driver to check for the event buffer's existence before trying to use it. Signed-off-by: Corey Minyard <minyard@acm.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/ipmi/ipmi_si_intf.c148
1 files changed, 119 insertions, 29 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 2438fdf889b4..259644646b82 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -82,12 +82,6 @@
82#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a 82#define SI_SHORT_TIMEOUT_USEC 250 /* .25ms when the SM request a
83 short timeout */ 83 short timeout */
84 84
85/* Bit for BMC global enables. */
86#define IPMI_BMC_RCV_MSG_INTR 0x01
87#define IPMI_BMC_EVT_MSG_INTR 0x02
88#define IPMI_BMC_EVT_MSG_BUFF 0x04
89#define IPMI_BMC_SYS_LOG 0x08
90
91enum si_intf_state { 85enum si_intf_state {
92 SI_NORMAL, 86 SI_NORMAL,
93 SI_GETTING_FLAGS, 87 SI_GETTING_FLAGS,
@@ -220,6 +214,9 @@ struct smi_info {
220 OEM2_DATA_AVAIL) 214 OEM2_DATA_AVAIL)
221 unsigned char msg_flags; 215 unsigned char msg_flags;
222 216
217 /* Does the BMC have an event buffer? */
218 char has_event_buffer;
219
223 /* 220 /*
224 * If set to true, this will request events the next time the 221 * If set to true, this will request events the next time the
225 * state machine is idle. 222 * state machine is idle.
@@ -968,7 +965,8 @@ static void request_events(void *send_info)
968{ 965{
969 struct smi_info *smi_info = send_info; 966 struct smi_info *smi_info = send_info;
970 967
971 if (atomic_read(&smi_info->stop_operation)) 968 if (atomic_read(&smi_info->stop_operation) ||
969 !smi_info->has_event_buffer)
972 return; 970 return;
973 971
974 atomic_set(&smi_info->req_events, 1); 972 atomic_set(&smi_info->req_events, 1);
@@ -2407,26 +2405,9 @@ static struct of_platform_driver ipmi_of_platform_driver = {
2407}; 2405};
2408#endif /* CONFIG_PPC_OF */ 2406#endif /* CONFIG_PPC_OF */
2409 2407
2410 2408static int wait_for_msg_done(struct smi_info *smi_info)
2411static int try_get_dev_id(struct smi_info *smi_info)
2412{ 2409{
2413 unsigned char msg[2];
2414 unsigned char *resp;
2415 unsigned long resp_len;
2416 enum si_sm_result smi_result; 2410 enum si_sm_result smi_result;
2417 int rv = 0;
2418
2419 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2420 if (!resp)
2421 return -ENOMEM;
2422
2423 /*
2424 * Do a Get Device ID command, since it comes back with some
2425 * useful info.
2426 */
2427 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2428 msg[1] = IPMI_GET_DEVICE_ID_CMD;
2429 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2430 2411
2431 smi_result = smi_info->handlers->event(smi_info->si_sm, 0); 2412 smi_result = smi_info->handlers->event(smi_info->si_sm, 0);
2432 for (;;) { 2413 for (;;) {
@@ -2441,16 +2422,39 @@ static int try_get_dev_id(struct smi_info *smi_info)
2441 } else 2422 } else
2442 break; 2423 break;
2443 } 2424 }
2444 if (smi_result == SI_SM_HOSED) { 2425 if (smi_result == SI_SM_HOSED)
2445 /* 2426 /*
2446 * We couldn't get the state machine to run, so whatever's at 2427 * We couldn't get the state machine to run, so whatever's at
2447 * the port is probably not an IPMI SMI interface. 2428 * the port is probably not an IPMI SMI interface.
2448 */ 2429 */
2449 rv = -ENODEV; 2430 return -ENODEV;
2431
2432 return 0;
2433}
2434
2435static int try_get_dev_id(struct smi_info *smi_info)
2436{
2437 unsigned char msg[2];
2438 unsigned char *resp;
2439 unsigned long resp_len;
2440 int rv = 0;
2441
2442 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2443 if (!resp)
2444 return -ENOMEM;
2445
2446 /*
2447 * Do a Get Device ID command, since it comes back with some
2448 * useful info.
2449 */
2450 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2451 msg[1] = IPMI_GET_DEVICE_ID_CMD;
2452 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2453
2454 rv = wait_for_msg_done(smi_info);
2455 if (rv)
2450 goto out; 2456 goto out;
2451 }
2452 2457
2453 /* Otherwise, we got some data. */
2454 resp_len = smi_info->handlers->get_result(smi_info->si_sm, 2458 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2455 resp, IPMI_MAX_MSG_LENGTH); 2459 resp, IPMI_MAX_MSG_LENGTH);
2456 2460
@@ -2462,6 +2466,88 @@ static int try_get_dev_id(struct smi_info *smi_info)
2462 return rv; 2466 return rv;
2463} 2467}
2464 2468
2469static int try_enable_event_buffer(struct smi_info *smi_info)
2470{
2471 unsigned char msg[3];
2472 unsigned char *resp;
2473 unsigned long resp_len;
2474 int rv = 0;
2475
2476 resp = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
2477 if (!resp)
2478 return -ENOMEM;
2479
2480 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2481 msg[1] = IPMI_GET_BMC_GLOBAL_ENABLES_CMD;
2482 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 2);
2483
2484 rv = wait_for_msg_done(smi_info);
2485 if (rv) {
2486 printk(KERN_WARNING
2487 "ipmi_si: Error getting response from get global,"
2488 " enables command, the event buffer is not"
2489 " enabled.\n");
2490 goto out;
2491 }
2492
2493 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2494 resp, IPMI_MAX_MSG_LENGTH);
2495
2496 if (resp_len < 4 ||
2497 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2498 resp[1] != IPMI_GET_BMC_GLOBAL_ENABLES_CMD ||
2499 resp[2] != 0) {
2500 printk(KERN_WARNING
2501 "ipmi_si: Invalid return from get global"
2502 " enables command, cannot enable the event"
2503 " buffer.\n");
2504 rv = -EINVAL;
2505 goto out;
2506 }
2507
2508 if (resp[3] & IPMI_BMC_EVT_MSG_BUFF)
2509 /* buffer is already enabled, nothing to do. */
2510 goto out;
2511
2512 msg[0] = IPMI_NETFN_APP_REQUEST << 2;
2513 msg[1] = IPMI_SET_BMC_GLOBAL_ENABLES_CMD;
2514 msg[2] = resp[3] | IPMI_BMC_EVT_MSG_BUFF;
2515 smi_info->handlers->start_transaction(smi_info->si_sm, msg, 3);
2516
2517 rv = wait_for_msg_done(smi_info);
2518 if (rv) {
2519 printk(KERN_WARNING
2520 "ipmi_si: Error getting response from set global,"
2521 " enables command, the event buffer is not"
2522 " enabled.\n");
2523 goto out;
2524 }
2525
2526 resp_len = smi_info->handlers->get_result(smi_info->si_sm,
2527 resp, IPMI_MAX_MSG_LENGTH);
2528
2529 if (resp_len < 3 ||
2530 resp[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2 ||
2531 resp[1] != IPMI_SET_BMC_GLOBAL_ENABLES_CMD) {
2532 printk(KERN_WARNING
2533 "ipmi_si: Invalid return from get global,"
2534 "enables command, not enable the event"
2535 " buffer.\n");
2536 rv = -EINVAL;
2537 goto out;
2538 }
2539
2540 if (resp[2] != 0)
2541 /*
2542 * An error when setting the event buffer bit means
2543 * that the event buffer is not supported.
2544 */
2545 rv = -ENOENT;
2546 out:
2547 kfree(resp);
2548 return rv;
2549}
2550
2465static int type_file_read_proc(char *page, char **start, off_t off, 2551static int type_file_read_proc(char *page, char **start, off_t off,
2466 int count, int *eof, void *data) 2552 int count, int *eof, void *data)
2467{ 2553{
@@ -2847,6 +2933,10 @@ static int try_smi_init(struct smi_info *new_smi)
2847 new_smi->intf_num = smi_num; 2933 new_smi->intf_num = smi_num;
2848 smi_num++; 2934 smi_num++;
2849 2935
2936 rv = try_enable_event_buffer(new_smi);
2937 if (rv == 0)
2938 new_smi->has_event_buffer = 1;
2939
2850 /* 2940 /*
2851 * Start clearing the flags before we enable interrupts or the 2941 * Start clearing the flags before we enable interrupts or the
2852 * timer to avoid racing with the timer. 2942 * timer to avoid racing with the timer.