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Commit 8c702e16 authored by Corey Minyard's avatar Corey Minyard Committed by Linus Torvalds
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[PATCH] ipmi poweroff: fix chassis control 

The IPMI power control function proc_write_chassctrl was badly written, it
directly used userspace pointers, it assumed that strings were NULL
terminated, and it used the evil sscanf function.  This converts over to
using the sysctl interface for this data and changes the semantics to be a
little more logical.
Signed-off-by: default avatarCorey Minyard <minyard@acm.org>
Cc: <viro@parcelfarce.linux.theplanet.co.uk>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 877197ef
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Showing with 71 additions and 80 deletions
Documentation/IPMI.txt
View file @ 8c702e16
......@@ -605,12 +605,13 @@ is in the ipmi_poweroff module. When the system requests a powerdown,
it will send the proper IPMI commands to do this. This is supported on
several platforms.
There is a module parameter named "poweroff_control" that may either be zero
(do a power down) or 2 (do a power cycle, power the system off, then power
it on in a few seconds). Setting ipmi_poweroff.poweroff_control=x will do
the same thing on the kernel command line. The parameter is also available
via the proc filesystem in /proc/ipmi/poweroff_control. Note that if the
system does not support power cycling, it will always to the power off.
There is a module parameter named "poweroff_powercycle" that may
either be zero (do a power down) or non-zero (do a power cycle, power
the system off, then power it on in a few seconds). Setting
ipmi_poweroff.poweroff_control=x will do the same thing on the kernel
command line. The parameter is also available via the proc filesystem
in /proc/sys/dev/ipmi/poweroff_powercycle. Note that if the system
does not support power cycling, it will always do the power off.
Note that if you have ACPI enabled, the system will prefer using ACPI to
power off.
drivers/char/ipmi/ipmi_poweroff.c
View file @ 8c702e16
......@@ -52,11 +52,11 @@ extern void (*pm_power_off)(void);
#define IPMI_CHASSIS_POWER_CYCLE 0x02 /* power cycle */
/* the IPMI data command */
static int poweroff_control = IPMI_CHASSIS_POWER_DOWN;
static int poweroff_powercycle;
/* parameter definition to allow user to flag power cycle */
module_param(poweroff_control, int, IPMI_CHASSIS_POWER_DOWN);
MODULE_PARM_DESC(poweroff_control, " Set to 2 to enable power cycle instead of power down. Power cycle is contingent on hardware support, otherwise it defaults back to power down.");
module_param(poweroff_powercycle, int, 0);
MODULE_PARM_DESC(poweroff_powercycles, " Set to non-zero to enable power cycle instead of power down. Power cycle is contingent on hardware support, otherwise it defaults back to power down.");
/* Stuff from the get device id command. */
static unsigned int mfg_id;
......@@ -385,37 +385,34 @@ static void ipmi_poweroff_chassis (ipmi_user_t user)
powercyclefailed:
printk(KERN_INFO PFX "Powering %s via IPMI chassis control command\n",
((poweroff_control != IPMI_CHASSIS_POWER_CYCLE) ? "down" : "cycle"));
(poweroff_powercycle ? "cycle" : "down"));
/*
* Power down
*/
send_msg.netfn = IPMI_NETFN_CHASSIS_REQUEST;
send_msg.cmd = IPMI_CHASSIS_CONTROL_CMD;
data[0] = poweroff_control;
if (poweroff_powercycle)
data[0] = IPMI_CHASSIS_POWER_CYCLE;
else
data[0] = IPMI_CHASSIS_POWER_DOWN;
send_msg.data = data;
send_msg.data_len = sizeof(data);
rv = ipmi_request_in_rc_mode(user,
(struct ipmi_addr *) &smi_addr,
&send_msg);
if (rv) {
switch (poweroff_control) {
case IPMI_CHASSIS_POWER_CYCLE:
/* power cycle failed, default to power down */
printk(KERN_ERR PFX "Unable to send chassis power " \
"cycle message, IPMI error 0x%x\n", rv);
poweroff_control = IPMI_CHASSIS_POWER_DOWN;
goto powercyclefailed;
case IPMI_CHASSIS_POWER_DOWN:
default:
printk(KERN_ERR PFX "Unable to send chassis power " \
"down message, IPMI error 0x%x\n", rv);
break;
if (poweroff_powercycle) {
/* power cycle failed, default to power down */
printk(KERN_ERR PFX "Unable to send chassis power " \
"cycle message, IPMI error 0x%x\n", rv);
poweroff_powercycle = 0;
goto powercyclefailed;
}
}
return;
printk(KERN_ERR PFX "Unable to send chassis power " \
"down message, IPMI error 0x%x\n", rv);
}
}
......@@ -561,39 +558,35 @@ static struct ipmi_smi_watcher smi_watcher =
#ifdef CONFIG_PROC_FS
/* displays properties to proc */
static int proc_read_chassctrl(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
return sprintf(page, "%d\t[ 0=powerdown 2=powercycle ]\n",
poweroff_control);
}
#include <linux/sysctl.h>
static ctl_table ipmi_table[] = {
{ .ctl_name = DEV_IPMI_POWEROFF_POWERCYCLE,
.procname = "poweroff_powercycle",
.data = &poweroff_powercycle,
.maxlen = sizeof(poweroff_powercycle),
.mode = 0644,
.proc_handler = &proc_dointvec },
{ }
};
/* process property writes from proc */
static int proc_write_chassctrl(struct file *file, const char *buffer,
unsigned long count, void *data)
{
int rv = count;
unsigned int newval = 0;
sscanf(buffer, "%d", &newval);
switch (newval) {
case IPMI_CHASSIS_POWER_CYCLE:
printk(KERN_INFO PFX "power cycle is now enabled\n");
poweroff_control = newval;
break;
case IPMI_CHASSIS_POWER_DOWN:
poweroff_control = IPMI_CHASSIS_POWER_DOWN;
break;
default:
rv = -EINVAL;
break;
}
static ctl_table ipmi_dir_table[] = {
{ .ctl_name = DEV_IPMI,
.procname = "ipmi",
.mode = 0555,
.child = ipmi_table },
{ }
};
return rv;
}
static ctl_table ipmi_root_table[] = {
{ .ctl_name = CTL_DEV,
.procname = "dev",
.mode = 0555,
.child = ipmi_dir_table },
{ }
};
static struct ctl_table_header *ipmi_table_header;
#endif /* CONFIG_PROC_FS */
/*
......@@ -601,41 +594,32 @@ static int proc_write_chassctrl(struct file *file, const char *buffer,
*/
static int ipmi_poweroff_init (void)
{
int rv;
struct proc_dir_entry *file;
int rv;
printk ("Copyright (C) 2004 MontaVista Software -"
" IPMI Powerdown via sys_reboot.\n");
switch (poweroff_control) {
case IPMI_CHASSIS_POWER_CYCLE:
printk(KERN_INFO PFX "Power cycle is enabled.\n");
break;
if (poweroff_powercycle)
printk(KERN_INFO PFX "Power cycle is enabled.\n");
case IPMI_CHASSIS_POWER_DOWN:
default:
poweroff_control = IPMI_CHASSIS_POWER_DOWN;
break;
#ifdef CONFIG_PROC_FS
ipmi_table_header = register_sysctl_table(ipmi_root_table, 1);
if (!ipmi_table_header) {
printk(KERN_ERR PFX "Unable to register powercycle sysctl\n");
rv = -ENOMEM;
goto out_err;
}
#endif
#ifdef CONFIG_PROC_FS
rv = ipmi_smi_watcher_register(&smi_watcher);
#endif
if (rv) {
unregister_sysctl_table(ipmi_table_header);
printk(KERN_ERR PFX "Unable to register SMI watcher: %d\n", rv);
goto out_err;
}
#ifdef CONFIG_PROC_FS
file = create_proc_entry("poweroff_control", 0, proc_ipmi_root);
if (!file) {
printk(KERN_ERR PFX "Unable to create proc power control\n");
} else {
file->nlink = 1;
file->read_proc = proc_read_chassctrl;
file->write_proc = proc_write_chassctrl;
file->owner = THIS_MODULE;
}
#endif
out_err:
return rv;
}
......@@ -646,7 +630,7 @@ static __exit void ipmi_poweroff_cleanup(void)
int rv;
#ifdef CONFIG_PROC_FS
remove_proc_entry("poweroff_control", proc_ipmi_root);
unregister_sysctl_table(ipmi_table_header);
#endif
ipmi_smi_watcher_unregister(&smi_watcher);
......
include/linux/sysctl.h
View file @ 8c702e16
......@@ -711,6 +711,7 @@ enum {
DEV_RAID=4,
DEV_MAC_HID=5,
DEV_SCSI=6,
DEV_IPMI=7,
};
/* /proc/sys/dev/cdrom */
......@@ -776,6 +777,11 @@ enum {
DEV_SCSI_LOGGING_LEVEL=1,
};
/* /proc/sys/dev/ipmi */
enum {
DEV_IPMI_POWEROFF_POWERCYCLE=1,
};
/* /proc/sys/abi */
enum
{
......
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