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[PATCH] ipmi: fix panic ipmb response
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The "null message handler" in the IPMI driver is used in startup and panic
situations to handle messages.  It was only designed to work with messages
from the local management controller, but in some cases it was used to get
messages from remote managmenet controllers, and the system would then
panic.  This patch makes the "null message handler" in the IPMI driver more
general so it works with any kind of message.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Corey Minyard authored and Linus Torvalds committed Sep 7, 2005
1 parent 1fdd75b commit 56a55ec
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Showing 2 changed files with 69 additions and 41 deletions.
107 changes: 67 additions & 40 deletions drivers/char/ipmi/ipmi_msghandler.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -219,7 +219,7 @@ struct ipmi_smi
interface comes in with a NULL user, call this routine with
it. Note that the message will still be freed by the
caller. This only works on the system interface. */
void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_smi_msg *msg);
void (*null_user_handler)(ipmi_smi_t intf, struct ipmi_recv_msg *msg);

/* When we are scanning the channels for an SMI, this will
tell which channel we are scanning. */
Expand Down Expand Up @@ -459,7 +459,27 @@ unsigned int ipmi_addr_length(int addr_type)

static void deliver_response(struct ipmi_recv_msg *msg)
{
msg->user->handler->ipmi_recv_hndl(msg, msg->user->handler_data);
if (! msg->user) {
ipmi_smi_t intf = msg->user_msg_data;
unsigned long flags;

/* Special handling for NULL users. */
if (intf->null_user_handler) {
intf->null_user_handler(intf, msg);
spin_lock_irqsave(&intf->counter_lock, flags);
intf->handled_local_responses++;
spin_unlock_irqrestore(&intf->counter_lock, flags);
} else {
/* No handler, so give up. */
spin_lock_irqsave(&intf->counter_lock, flags);
intf->unhandled_local_responses++;
spin_unlock_irqrestore(&intf->counter_lock, flags);
}
ipmi_free_recv_msg(msg);
} else {
msg->user->handler->ipmi_recv_hndl(msg,
msg->user->handler_data);
}
}

/* Find the next sequence number not being used and add the given
Expand Down Expand Up @@ -1389,6 +1409,8 @@ int ipmi_request_settime(ipmi_user_t user,
unsigned char saddr, lun;
int rv;

if (! user)
return -EINVAL;
rv = check_addr(user->intf, addr, &saddr, &lun);
if (rv)
return rv;
Expand Down Expand Up @@ -1418,6 +1440,8 @@ int ipmi_request_supply_msgs(ipmi_user_t user,
unsigned char saddr, lun;
int rv;

if (! user)
return -EINVAL;
rv = check_addr(user->intf, addr, &saddr, &lun);
if (rv)
return rv;
Expand Down Expand Up @@ -1638,7 +1662,7 @@ send_channel_info_cmd(ipmi_smi_t intf, int chan)
(struct ipmi_addr *) &si,
0,
&msg,
NULL,
intf,
NULL,
NULL,
0,
Expand All @@ -1648,19 +1672,20 @@ send_channel_info_cmd(ipmi_smi_t intf, int chan)
}

static void
channel_handler(ipmi_smi_t intf, struct ipmi_smi_msg *msg)
channel_handler(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
int rv = 0;
int chan;

if ((msg->rsp[0] == (IPMI_NETFN_APP_RESPONSE << 2))
&& (msg->rsp[1] == IPMI_GET_CHANNEL_INFO_CMD))
if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
&& (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
&& (msg->msg.cmd == IPMI_GET_CHANNEL_INFO_CMD))
{
/* It's the one we want */
if (msg->rsp[2] != 0) {
if (msg->msg.data[0] != 0) {
/* Got an error from the channel, just go on. */

if (msg->rsp[2] == IPMI_INVALID_COMMAND_ERR) {
if (msg->msg.data[0] == IPMI_INVALID_COMMAND_ERR) {
/* If the MC does not support this
command, that is legal. We just
assume it has one IPMB at channel
Expand All @@ -1677,13 +1702,13 @@ channel_handler(ipmi_smi_t intf, struct ipmi_smi_msg *msg)
}
goto next_channel;
}
if (msg->rsp_size < 6) {
if (msg->msg.data_len < 4) {
/* Message not big enough, just go on. */
goto next_channel;
}
chan = intf->curr_channel;
intf->channels[chan].medium = msg->rsp[4] & 0x7f;
intf->channels[chan].protocol = msg->rsp[5] & 0x1f;
intf->channels[chan].medium = msg->msg.data[2] & 0x7f;
intf->channels[chan].protocol = msg->msg.data[3] & 0x1f;

next_channel:
intf->curr_channel++;
Expand Down Expand Up @@ -2382,6 +2407,14 @@ static int handle_bmc_rsp(ipmi_smi_t intf,
unsigned long flags;

recv_msg = (struct ipmi_recv_msg *) msg->user_data;
if (recv_msg == NULL)
{
printk(KERN_WARNING"IPMI message received with no owner. This\n"
"could be because of a malformed message, or\n"
"because of a hardware error. Contact your\n"
"hardware vender for assistance\n");
return 0;
}

/* Make sure the user still exists. */
list_for_each_entry(user, &(intf->users), link) {
Expand All @@ -2392,19 +2425,11 @@ static int handle_bmc_rsp(ipmi_smi_t intf,
}
}

if (!found) {
/* Special handling for NULL users. */
if (!recv_msg->user && intf->null_user_handler){
intf->null_user_handler(intf, msg);
spin_lock_irqsave(&intf->counter_lock, flags);
intf->handled_local_responses++;
spin_unlock_irqrestore(&intf->counter_lock, flags);
}else{
/* The user for the message went away, so give up. */
spin_lock_irqsave(&intf->counter_lock, flags);
intf->unhandled_local_responses++;
spin_unlock_irqrestore(&intf->counter_lock, flags);
}
if ((! found) && recv_msg->user) {
/* The user for the message went away, so give up. */
spin_lock_irqsave(&intf->counter_lock, flags);
intf->unhandled_local_responses++;
spin_unlock_irqrestore(&intf->counter_lock, flags);
ipmi_free_recv_msg(recv_msg);
} else {
struct ipmi_system_interface_addr *smi_addr;
Expand Down Expand Up @@ -2890,28 +2915,30 @@ static void dummy_recv_done_handler(struct ipmi_recv_msg *msg)
}

#ifdef CONFIG_IPMI_PANIC_STRING
static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_smi_msg *msg)
static void event_receiver_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
if ((msg->rsp[0] == (IPMI_NETFN_SENSOR_EVENT_RESPONSE << 2))
&& (msg->rsp[1] == IPMI_GET_EVENT_RECEIVER_CMD)
&& (msg->rsp[2] == IPMI_CC_NO_ERROR))
if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
&& (msg->msg.netfn == IPMI_NETFN_SENSOR_EVENT_RESPONSE)
&& (msg->msg.cmd == IPMI_GET_EVENT_RECEIVER_CMD)
&& (msg->msg.data[0] == IPMI_CC_NO_ERROR))
{
/* A get event receiver command, save it. */
intf->event_receiver = msg->rsp[3];
intf->event_receiver_lun = msg->rsp[4] & 0x3;
intf->event_receiver = msg->msg.data[1];
intf->event_receiver_lun = msg->msg.data[2] & 0x3;
}
}

static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_smi_msg *msg)
static void device_id_fetcher(ipmi_smi_t intf, struct ipmi_recv_msg *msg)
{
if ((msg->rsp[0] == (IPMI_NETFN_APP_RESPONSE << 2))
&& (msg->rsp[1] == IPMI_GET_DEVICE_ID_CMD)
&& (msg->rsp[2] == IPMI_CC_NO_ERROR))
if ((msg->addr.addr_type == IPMI_SYSTEM_INTERFACE_ADDR_TYPE)
&& (msg->msg.netfn == IPMI_NETFN_APP_RESPONSE)
&& (msg->msg.cmd == IPMI_GET_DEVICE_ID_CMD)
&& (msg->msg.data[0] == IPMI_CC_NO_ERROR))
{
/* A get device id command, save if we are an event
receiver or generator. */
intf->local_sel_device = (msg->rsp[8] >> 2) & 1;
intf->local_event_generator = (msg->rsp[8] >> 5) & 1;
intf->local_sel_device = (msg->msg.data[6] >> 2) & 1;
intf->local_event_generator = (msg->msg.data[6] >> 5) & 1;
}
}
#endif
Expand Down Expand Up @@ -2967,7 +2994,7 @@ static void send_panic_events(char *str)
&addr,
0,
&msg,
NULL,
intf,
&smi_msg,
&recv_msg,
0,
Expand Down Expand Up @@ -3013,7 +3040,7 @@ static void send_panic_events(char *str)
&addr,
0,
&msg,
NULL,
intf,
&smi_msg,
&recv_msg,
0,
Expand All @@ -3033,7 +3060,7 @@ static void send_panic_events(char *str)
&addr,
0,
&msg,
NULL,
intf,
&smi_msg,
&recv_msg,
0,
Expand Down Expand Up @@ -3095,7 +3122,7 @@ static void send_panic_events(char *str)
&addr,
0,
&msg,
NULL,
intf,
&smi_msg,
&recv_msg,
0,
Expand Down
3 changes: 2 additions & 1 deletion include/linux/ipmi.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -242,7 +242,8 @@ struct ipmi_recv_msg
/* The user_msg_data is the data supplied when a message was
sent, if this is a response to a sent message. If this is
not a response to a sent message, then user_msg_data will
be NULL. */
be NULL. If the user above is NULL, then this will be the
intf. */
void *user_msg_data;

/* Call this when done with the message. It will presumably free
Expand Down

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