Three patches to remove issues with probing interface default, to make
sure the driver is completely idle if nothing is happening on it, and to
compile the IPMI driver into the kernel if ACPI is enabled.
The ACPI spec really requires that the IPMI driver be built into the
kernel because ACPI uses IPMI for some operations. But some people
do not want the driver even using the mimimal amount of CPU it uses
when idle. And the default probing, even though sort of implied to
be required by the spec, is really a bad idea and can result in hangs
on systems with other hardware at those location.
Hopefully these patches make everyone happy.
From: Corey Minyard <[email protected]>
The default probing can cause problems with some system, slow booting,
extra CPU usages, etc. Turn it off by default and give a config option
to enable it.
From: Matthew Garrett <[email protected]>
Signed-off-by: Corey Minyard <[email protected]>
---
drivers/char/ipmi/Kconfig | 10 ++++++++++
drivers/char/ipmi/ipmi_si_intf.c | 4 ++++
2 files changed, 14 insertions(+)
diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
index 0baa8fa..8e14360 100644
--- a/drivers/char/ipmi/Kconfig
+++ b/drivers/char/ipmi/Kconfig
@@ -50,6 +50,16 @@ config IPMI_SI
Currently, only KCS and SMIC are supported. If
you are using IPMI, you should probably say "y" here.
+config IPMI_SI_PROBE_DEFAULTS
+ bool 'Probe for all possible IPMI system interfaces by default'
+ help
+ Modern systems will usually expose IPMI interfaces via a discoverable
+ firmware mechanism such as ACPI or DMI. Older systems do not, and so
+ the driver is forced to probe hardware manually. This may cause boot
+ delays. Say "n" here to disable this manual probing. IPMI will then
+ only be available on older systems if the "ipmi_si_intf.trydefaults=1"
+ boot argument is passed.
+
config IPMI_WATCHDOG
tristate 'IPMI Watchdog Timer'
help
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 03f4189..7b420e1 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1230,7 +1230,11 @@ static bool si_tryplatform = 1;
#ifdef CONFIG_PCI
static bool si_trypci = 1;
#endif
+#ifdef CONFIG_IPMI_SI_PROBE_DEFAULTS
static bool si_trydefaults = 1;
+#else
+static bool si_trydefaults;
+#endif
static char *si_type[SI_MAX_PARMS];
#define MAX_SI_TYPE_STR 30
static char si_type_str[MAX_SI_TYPE_STR];
--
1.8.3.1
From: Corey Minyard <[email protected]>
The IPMI driver would wake up periodically looking for events and
watchdog pretimeouts. If there is nothing waiting for these events,
it's really kind of pointless to be checking for them. So modify
the driver so the message handler can pass down if it needs the
lower layer to be waiting for these. Modify the system interface
lower layer to turn off all timer and thread activity if the upper
layer doesn't need anything and it is not currently handling messages.
And modify the message handler to not restart the timer if its timer
is not needed.
The timers and kthread will still be enabled if:
* The SI interface is handling a message.
* A user has enabled watching for events.
* The IPMI watchdog timer is in use (since it uses pretimeouts).
* The message handler is waiting on a remote response.
* A user has registered to receive commands.
This mostly affects interfaces without interrupts. Interfaces
with interrupts already don't use CPU in the system interface
when the interface is idle.
Signed-off-by: Corey Minyard <[email protected]>
---
drivers/char/ipmi/ipmi_msghandler.c | 215 ++++++++++++++++++++++--------------
drivers/char/ipmi/ipmi_si_intf.c | 67 +++++++----
include/linux/ipmi_smi.h | 7 ++
3 files changed, 187 insertions(+), 102 deletions(-)
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index ec4e10f..f49b4c6 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -55,6 +55,7 @@ static struct ipmi_recv_msg *ipmi_alloc_recv_msg(void);
static int ipmi_init_msghandler(void);
static void smi_recv_tasklet(unsigned long);
static void handle_new_recv_msgs(ipmi_smi_t intf);
+static void need_waiter(ipmi_smi_t intf);
static int initialized;
@@ -73,6 +74,20 @@ static struct proc_dir_entry *proc_ipmi_root;
*/
#define MAX_MSG_TIMEOUT 60000
+/* Call every ~1000 ms. */
+#define IPMI_TIMEOUT_TIME 1000
+
+/* How many jiffies does it take to get to the timeout time. */
+#define IPMI_TIMEOUT_JIFFIES ((IPMI_TIMEOUT_TIME * HZ) / 1000)
+
+/*
+ * Request events from the queue every second (this is the number of
+ * IPMI_TIMEOUT_TIMES between event requests). Hopefully, in the
+ * future, IPMI will add a way to know immediately if an event is in
+ * the queue and this silliness can go away.
+ */
+#define IPMI_REQUEST_EV_TIME (1000 / (IPMI_TIMEOUT_TIME))
+
/*
* The main "user" data structure.
*/
@@ -383,6 +398,9 @@ struct ipmi_smi {
unsigned int waiting_events_count; /* How many events in queue? */
char delivering_events;
char event_msg_printed;
+ atomic_t event_waiters;
+ unsigned int ticks_to_req_ev;
+ int last_needs_timer;
/*
* The event receiver for my BMC, only really used at panic
@@ -451,7 +469,6 @@ static DEFINE_MUTEX(ipmi_interfaces_mutex);
static LIST_HEAD(smi_watchers);
static DEFINE_MUTEX(smi_watchers_mutex);
-
#define ipmi_inc_stat(intf, stat) \
atomic_inc(&(intf)->stats[IPMI_STAT_ ## stat])
#define ipmi_get_stat(intf, stat) \
@@ -772,6 +789,7 @@ static int intf_next_seq(ipmi_smi_t intf,
*seq = i;
*seqid = intf->seq_table[i].seqid;
intf->curr_seq = (i+1)%IPMI_IPMB_NUM_SEQ;
+ need_waiter(intf);
} else {
rv = -EAGAIN;
}
@@ -966,6 +984,11 @@ int ipmi_create_user(unsigned int if_num,
spin_lock_irqsave(&intf->seq_lock, flags);
list_add_rcu(&new_user->link, &intf->users);
spin_unlock_irqrestore(&intf->seq_lock, flags);
+ if (handler->ipmi_watchdog_pretimeout) {
+ /* User wants pretimeouts, so make sure to watch for them. */
+ if (atomic_inc_return(&intf->event_waiters) == 1)
+ need_waiter(intf);
+ }
*user = new_user;
return 0;
@@ -1021,6 +1044,12 @@ int ipmi_destroy_user(ipmi_user_t user)
user->valid = 0;
+ if (user->handler->ipmi_watchdog_pretimeout)
+ atomic_dec(&intf->event_waiters);
+
+ if (user->gets_events)
+ atomic_dec(&intf->event_waiters);
+
/* Remove the user from the interface's sequence table. */
spin_lock_irqsave(&intf->seq_lock, flags);
list_del_rcu(&user->link);
@@ -1194,7 +1223,17 @@ int ipmi_set_gets_events(ipmi_user_t user, int val)
INIT_LIST_HEAD(&msgs);
spin_lock_irqsave(&intf->events_lock, flags);
- user->gets_events = val;
+ if (user->gets_events == !!val)
+ goto out;
+
+ user->gets_events = !!val;
+
+ if (val) {
+ if (atomic_inc_return(&intf->event_waiters) == 1)
+ need_waiter(intf);
+ } else {
+ atomic_dec(&intf->event_waiters);
+ }
if (intf->delivering_events)
/*
@@ -1289,6 +1328,9 @@ int ipmi_register_for_cmd(ipmi_user_t user,
goto out_unlock;
}
+ if (atomic_inc_return(&intf->event_waiters) == 1)
+ need_waiter(intf);
+
list_add_rcu(&rcvr->link, &intf->cmd_rcvrs);
out_unlock:
@@ -1330,6 +1372,7 @@ int ipmi_unregister_for_cmd(ipmi_user_t user,
mutex_unlock(&intf->cmd_rcvrs_mutex);
synchronize_rcu();
while (rcvrs) {
+ atomic_dec(&intf->event_waiters);
rcvr = rcvrs;
rcvrs = rcvr->next;
kfree(rcvr);
@@ -2876,6 +2919,8 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
(unsigned long) intf);
atomic_set(&intf->watchdog_pretimeouts_to_deliver, 0);
spin_lock_init(&intf->events_lock);
+ atomic_set(&intf->event_waiters, 0);
+ intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
INIT_LIST_HEAD(&intf->waiting_events);
intf->waiting_events_count = 0;
mutex_init(&intf->cmd_rcvrs_mutex);
@@ -3965,7 +4010,8 @@ smi_from_recv_msg(ipmi_smi_t intf, struct ipmi_recv_msg *recv_msg,
static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
struct list_head *timeouts, long timeout_period,
- int slot, unsigned long *flags)
+ int slot, unsigned long *flags,
+ unsigned int *waiting_msgs)
{
struct ipmi_recv_msg *msg;
struct ipmi_smi_handlers *handlers;
@@ -3977,8 +4023,10 @@ static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
return;
ent->timeout -= timeout_period;
- if (ent->timeout > 0)
+ if (ent->timeout > 0) {
+ (*waiting_msgs)++;
return;
+ }
if (ent->retries_left == 0) {
/* The message has used all its retries. */
@@ -3995,6 +4043,8 @@ static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
struct ipmi_smi_msg *smi_msg;
/* More retries, send again. */
+ (*waiting_msgs)++;
+
/*
* Start with the max timer, set to normal timer after
* the message is sent.
@@ -4040,117 +4090,118 @@ static void check_msg_timeout(ipmi_smi_t intf, struct seq_table *ent,
}
}
-static void ipmi_timeout_handler(long timeout_period)
+static unsigned int ipmi_timeout_handler(ipmi_smi_t intf, long timeout_period)
{
- ipmi_smi_t intf;
struct list_head timeouts;
struct ipmi_recv_msg *msg, *msg2;
unsigned long flags;
int i;
+ unsigned int waiting_msgs = 0;
- rcu_read_lock();
- list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
- tasklet_schedule(&intf->recv_tasklet);
-
- /*
- * Go through the seq table and find any messages that
- * have timed out, putting them in the timeouts
- * list.
- */
- INIT_LIST_HEAD(&timeouts);
- spin_lock_irqsave(&intf->seq_lock, flags);
- for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
- check_msg_timeout(intf, &(intf->seq_table[i]),
- &timeouts, timeout_period, i,
- &flags);
- spin_unlock_irqrestore(&intf->seq_lock, flags);
+ /*
+ * Go through the seq table and find any messages that
+ * have timed out, putting them in the timeouts
+ * list.
+ */
+ INIT_LIST_HEAD(&timeouts);
+ spin_lock_irqsave(&intf->seq_lock, flags);
+ for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++)
+ check_msg_timeout(intf, &(intf->seq_table[i]),
+ &timeouts, timeout_period, i,
+ &flags, &waiting_msgs);
+ spin_unlock_irqrestore(&intf->seq_lock, flags);
- list_for_each_entry_safe(msg, msg2, &timeouts, link)
- deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE);
+ list_for_each_entry_safe(msg, msg2, &timeouts, link)
+ deliver_err_response(msg, IPMI_TIMEOUT_COMPLETION_CODE);
- /*
- * Maintenance mode handling. Check the timeout
- * optimistically before we claim the lock. It may
- * mean a timeout gets missed occasionally, but that
- * only means the timeout gets extended by one period
- * in that case. No big deal, and it avoids the lock
- * most of the time.
- */
+ /*
+ * Maintenance mode handling. Check the timeout
+ * optimistically before we claim the lock. It may
+ * mean a timeout gets missed occasionally, but that
+ * only means the timeout gets extended by one period
+ * in that case. No big deal, and it avoids the lock
+ * most of the time.
+ */
+ if (intf->auto_maintenance_timeout > 0) {
+ spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
if (intf->auto_maintenance_timeout > 0) {
- spin_lock_irqsave(&intf->maintenance_mode_lock, flags);
- if (intf->auto_maintenance_timeout > 0) {
- intf->auto_maintenance_timeout
- -= timeout_period;
- if (!intf->maintenance_mode
- && (intf->auto_maintenance_timeout <= 0)) {
- intf->maintenance_mode_enable = 0;
- maintenance_mode_update(intf);
- }
+ intf->auto_maintenance_timeout
+ -= timeout_period;
+ if (!intf->maintenance_mode
+ && (intf->auto_maintenance_timeout <= 0)) {
+ intf->maintenance_mode_enable = 0;
+ maintenance_mode_update(intf);
}
- spin_unlock_irqrestore(&intf->maintenance_mode_lock,
- flags);
}
+ spin_unlock_irqrestore(&intf->maintenance_mode_lock,
+ flags);
}
- rcu_read_unlock();
+
+ tasklet_schedule(&intf->recv_tasklet);
+
+ return waiting_msgs;
}
-static void ipmi_request_event(void)
+static void ipmi_request_event(ipmi_smi_t intf)
{
- ipmi_smi_t intf;
struct ipmi_smi_handlers *handlers;
- rcu_read_lock();
- /*
- * Called from the timer, no need to check if handlers is
- * valid.
- */
- list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
- /* No event requests when in maintenance mode. */
- if (intf->maintenance_mode_enable)
- continue;
+ /* No event requests when in maintenance mode. */
+ if (intf->maintenance_mode_enable)
+ return;
- handlers = intf->handlers;
- if (handlers)
- handlers->request_events(intf->send_info);
- }
- rcu_read_unlock();
+ handlers = intf->handlers;
+ if (handlers)
+ handlers->request_events(intf->send_info);
}
static struct timer_list ipmi_timer;
-/* Call every ~1000 ms. */
-#define IPMI_TIMEOUT_TIME 1000
-
-/* How many jiffies does it take to get to the timeout time. */
-#define IPMI_TIMEOUT_JIFFIES ((IPMI_TIMEOUT_TIME * HZ) / 1000)
-
-/*
- * Request events from the queue every second (this is the number of
- * IPMI_TIMEOUT_TIMES between event requests). Hopefully, in the
- * future, IPMI will add a way to know immediately if an event is in
- * the queue and this silliness can go away.
- */
-#define IPMI_REQUEST_EV_TIME (1000 / (IPMI_TIMEOUT_TIME))
-
static atomic_t stop_operation;
-static unsigned int ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
static void ipmi_timeout(unsigned long data)
{
+ ipmi_smi_t intf;
+ int nt = 0;
+
if (atomic_read(&stop_operation))
return;
- ticks_to_req_ev--;
- if (ticks_to_req_ev == 0) {
- ipmi_request_event();
- ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
- }
+ rcu_read_lock();
+ list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
+ int lnt = 0;
+
+ if (atomic_read(&intf->event_waiters)) {
+ intf->ticks_to_req_ev--;
+ if (intf->ticks_to_req_ev == 0) {
+ ipmi_request_event(intf);
+ intf->ticks_to_req_ev = IPMI_REQUEST_EV_TIME;
+ }
+ lnt++;
+ }
- ipmi_timeout_handler(IPMI_TIMEOUT_TIME);
+ lnt += ipmi_timeout_handler(intf, IPMI_TIMEOUT_TIME);
- mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
+ lnt = !!lnt;
+ if (lnt != intf->last_needs_timer &&
+ intf->handlers->set_need_watch)
+ intf->handlers->set_need_watch(intf->send_info, lnt);
+ intf->last_needs_timer = lnt;
+
+ nt += lnt;
+ }
+ rcu_read_unlock();
+
+ if (nt)
+ mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
}
+static void need_waiter(ipmi_smi_t intf)
+{
+ /* Racy, but worst case we start the timer twice. */
+ if (!timer_pending(&ipmi_timer))
+ mod_timer(&ipmi_timer, jiffies + IPMI_TIMEOUT_JIFFIES);
+}
static atomic_t smi_msg_inuse_count = ATOMIC_INIT(0);
static atomic_t recv_msg_inuse_count = ATOMIC_INIT(0);
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 7b420e1..dd2bf2a 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -255,6 +255,9 @@ struct smi_info {
/* Used to gracefully stop the timer without race conditions. */
atomic_t stop_operation;
+ /* Are we waiting for the events, pretimeouts, received msgs? */
+ atomic_t need_watch;
+
/*
* The driver will disable interrupts when it gets into a
* situation where it cannot handle messages due to lack of
@@ -854,6 +857,27 @@ static enum si_sm_result smi_event_handler(struct smi_info *smi_info,
return si_sm_result;
}
+static void check_start_timer_thread(struct smi_info *smi_info)
+{
+ if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
+ /*
+ * last_timeout_jiffies is updated here to avoid
+ * smi_timeout() handler passing very large time_diff
+ * value to smi_event_handler() that causes
+ * the send command to abort.
+ */
+ smi_info->last_timeout_jiffies = jiffies;
+
+ mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES);
+
+ if (smi_info->thread)
+ wake_up_process(smi_info->thread);
+
+ start_next_msg(smi_info);
+ smi_event_handler(smi_info, 0);
+ }
+}
+
static void sender(void *send_info,
struct ipmi_smi_msg *msg,
int priority)
@@ -907,23 +931,7 @@ static void sender(void *send_info,
else
list_add_tail(&msg->link, &smi_info->xmit_msgs);
- if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
- /*
- * last_timeout_jiffies is updated here to avoid
- * smi_timeout() handler passing very large time_diff
- * value to smi_event_handler() that causes
- * the send command to abort.
- */
- smi_info->last_timeout_jiffies = jiffies;
-
- mod_timer(&smi_info->si_timer, jiffies + SI_TIMEOUT_JIFFIES);
-
- if (smi_info->thread)
- wake_up_process(smi_info->thread);
-
- start_next_msg(smi_info);
- smi_event_handler(smi_info, 0);
- }
+ check_start_timer_thread(smi_info);
spin_unlock_irqrestore(&smi_info->si_lock, flags);
}
@@ -1012,9 +1020,15 @@ static int ipmi_thread(void *data)
; /* do nothing */
else if (smi_result == SI_SM_CALL_WITH_DELAY && busy_wait)
schedule();
- else if (smi_result == SI_SM_IDLE)
- schedule_timeout_interruptible(100);
- else
+ else if (smi_result == SI_SM_IDLE) {
+ if (atomic_read(&smi_info->need_watch)) {
+ schedule_timeout_interruptible(100);
+ } else {
+ /* Wait to be woken up when we are needed. */
+ __set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ }
+ } else
schedule_timeout_interruptible(1);
}
return 0;
@@ -1050,6 +1064,17 @@ static void request_events(void *send_info)
atomic_set(&smi_info->req_events, 1);
}
+static void set_need_watch(void *send_info, int enable)
+{
+ struct smi_info *smi_info = send_info;
+ unsigned long flags;
+
+ atomic_set(&smi_info->need_watch, enable);
+ spin_lock_irqsave(&smi_info->si_lock, flags);
+ check_start_timer_thread(smi_info);
+ spin_unlock_irqrestore(&smi_info->si_lock, flags);
+}
+
static int initialized;
static void smi_timeout(unsigned long data)
@@ -1203,6 +1228,7 @@ static struct ipmi_smi_handlers handlers = {
.get_smi_info = get_smi_info,
.sender = sender,
.request_events = request_events,
+ .set_need_watch = set_need_watch,
.set_maintenance_mode = set_maintenance_mode,
.set_run_to_completion = set_run_to_completion,
.poll = poll,
@@ -3347,6 +3373,7 @@ static int try_smi_init(struct smi_info *new_smi)
new_smi->interrupt_disabled = 1;
atomic_set(&new_smi->stop_operation, 0);
+ atomic_set(&new_smi->need_watch, 0);
new_smi->intf_num = smi_num;
smi_num++;
diff --git a/include/linux/ipmi_smi.h b/include/linux/ipmi_smi.h
index 8ea3fe0..2a7ff30 100644
--- a/include/linux/ipmi_smi.h
+++ b/include/linux/ipmi_smi.h
@@ -109,6 +109,13 @@ struct ipmi_smi_handlers {
events from the BMC we are attached to. */
void (*request_events)(void *send_info);
+ /* Called by the upper layer when some user requires that the
+ interface watch for events, received messages, watchdog
+ pretimeouts, or not. Used by the SMI to know if it should
+ watch for these. This may be NULL if the SMI does not
+ implement it. */
+ void (*set_need_watch)(void *send_info, int enable);
+
/* Called when the interface should go into "run to
completion" mode. If this call sets the value to true, the
interface should make sure that all messages are flushed
--
1.8.3.1
From: Matthew Garrett <[email protected]>
The ACPI IPMI driver implements IPMI operation region support for the ACPI
core. Systems that declare ACPI operation regions may reference them at any
time, including during kernel initialisation. These accesses will fail
unless the ACPI IPMI driver is present, and undesirable system behaviour
may result. Set the default to Y in order to encourage distributions and
users to configure kernels to avoid awkward surprises.
Signed-off-by: Matthew Garrett <[email protected]>
---
drivers/acpi/Kconfig | 2 +-
drivers/char/ipmi/Kconfig | 2 ++
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 4770de5..0e6aab9 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -162,7 +162,7 @@ config ACPI_PROCESSOR
config ACPI_IPMI
tristate "IPMI"
depends on IPMI_SI
- default n
+ default y
help
This driver enables the ACPI to access the BMC controller. And it
uses the IPMI request/response message to communicate with BMC
diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
index 8e14360..5eb7e85 100644
--- a/drivers/char/ipmi/Kconfig
+++ b/drivers/char/ipmi/Kconfig
@@ -5,6 +5,7 @@
menuconfig IPMI_HANDLER
tristate 'IPMI top-level message handler'
depends on HAS_IOMEM
+ default y if ACPI
help
This enables the central IPMI message handler, required for IPMI
to work.
@@ -45,6 +46,7 @@ config IPMI_DEVICE_INTERFACE
config IPMI_SI
tristate 'IPMI System Interface handler'
+ default y if ACPI
help
Provides a driver for System Interfaces (KCS, SMIC, BT).
Currently, only KCS and SMIC are supported. If
--
1.8.3.1
On Sunday, February 23, 2014 08:23:33 PM [email protected] wrote:
> Three patches to remove issues with probing interface default, to make
> sure the driver is completely idle if nothing is happening on it, and to
> compile the IPMI driver into the kernel if ACPI is enabled.
>
> The ACPI spec really requires that the IPMI driver be built into the
> kernel because ACPI uses IPMI for some operations. But some people
> do not want the driver even using the mimimal amount of CPU it uses
> when idle. And the default probing, even though sort of implied to
> be required by the spec, is really a bad idea and can result in hangs
> on systems with other hardware at those location.
>
> Hopefully these patches make everyone happy.
No objections from my side.
I'll drop the Matthew's patch ([3/3] in this series) from my tree, then, so
please carry it along will any followups if needed.
Thanks,
Rafael
Hi Corey,
On Sun, Feb 23, 2014 at 08:23:34PM -0600, [email protected] wrote:
Would not
static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
work better here?
Thanks.
--
Dmitry
On Mon, 2014-02-24 at 08:53 -0800, Dmitry Torokhov wrote:
> Would not
>
> static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
>
> work better here?
Yes, it would. Sorry, I should have thought of that.
--
Matthew Garrett <[email protected]>
????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay? ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?
On Sun, Feb 23, 2014 at 08:23:35PM -0600, [email protected] wrote:
> @@ -1194,7 +1223,17 @@ int ipmi_set_gets_events(ipmi_user_t user, int val)
> INIT_LIST_HEAD(&msgs);
>
> spin_lock_irqsave(&intf->events_lock, flags);
> - user->gets_events = val;
> + if (user->gets_events == !!val)
> + goto out;
> +
> + user->gets_events = !!val;
Why not have val declared as bool and let compiler convert as needed?
Thanks.
--
Dmitry
On 02/24/2014 10:53 AM, Dmitry Torokhov wrote:
> Hi Corey,
>
> On Sun, Feb 23, 2014 at 08:23:34PM -0600, [email protected] wrote:
> Would not
>
> static bool si_trydefaults = IS_ENABLED(CONFIG_IPMI_SI_PROBE_DEFAULTS);
>
> work better here?
>
> Thanks.
>
Certainly. I will update it. Thanks,
-corey
On 02/24/2014 10:57 AM, Dmitry Torokhov wrote:
> On Sun, Feb 23, 2014 at 08:23:35PM -0600, [email protected] wrote:
>> @@ -1194,7 +1223,17 @@ int ipmi_set_gets_events(ipmi_user_t user, int val)
>> INIT_LIST_HEAD(&msgs);
>>
>> spin_lock_irqsave(&intf->events_lock, flags);
>> - user->gets_events = val;
>> + if (user->gets_events == !!val)
>> + goto out;
>> +
>> + user->gets_events = !!val;
> Why not have val declared as bool and let compiler convert as needed?
>
> Thanks.
>
Because I've been programming in C since long before there was a bool
type, and I need to change the way I think. Fixed, thanks.
-core