Commit b361e27b authored by Corey Minyard's avatar Corey Minyard Committed by Linus Torvalds

[PATCH] IPMI: system interface hotplug

Add the ability to hot add and remove interfaces in the ipmi_si driver.  Any
users who have the device open will get errors if they try to send a message.
Signed-off-by: default avatarCorey Minyard <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 15c62e10
......@@ -365,6 +365,7 @@ You can change this at module load time (for a module) with:
Each of these except si_trydefaults is a list, the first item for the
first interface, second item for the second interface, etc.
......@@ -416,6 +417,11 @@ by the driver, but systems with broken interrupts might need an enable,
or users that don't want the daemon (don't need the performance, don't
want the CPU hit) can disable it.
If unload_when_empty is set to 1, the driver will be unloaded if it
doesn't find any interfaces or all the interfaces fail to work. The
default is one. Setting to 0 is useful with the hotmod, but is
obviously only useful for modules.
When compiled into the kernel, the parameters can be specified on the
kernel command line as:
......@@ -441,6 +447,25 @@ have high-res timers enabled in the kernel and you don't have
interrupts enabled, the driver will run VERY slowly. Don't blame me,
these interfaces suck.
The driver supports a hot add and remove of interfaces. This way,
interfaces can be added or removed after the kernel is up and running.
This is done using /sys/modules/ipmi_si/hotmod, which is a write-only
parameter. You write a string to this interface. The string has the
The "op"s are:
You can specify more than one interface on the line. The "opt"s are:
ipmb=<ipmb slave addr>
and these have the same meanings as discussed above. Note that you
can also use this on the kernel command line for a more compact format
for specifying an interface. Note that when removing an interface,
only the first three parameters (si type, address type, and address)
are used for the comparison. Any options are ignored for removing.
The SMBus Driver
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