9043a2650c
lockdep, but it's a mechanical change. Cheers, Rusty. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJRJAcuAAoJENkgDmzRrbjxsw0P/3eXb+LddYnx0V0uHYdKpCUf 4vdW7X0fX3Z+aUK69IWRL/6ahoO4TpaHYGHBDjEoivyQ0GDq14X7JNWsYYt3LdMf 3wmDgRc2cn/mZOJbFeVpNV8ox5l/xc0CUvV+iQ8tMjfQItXMXgWUFZKMECsXKSO6 eex3lrw9M2jAX2uL8LQPp9W8xtKu24nSZRC6tH5riE/8fCzi1cZPPAqfxP5c8Lee ZXtbCRSyAFENZLpKyMe1PC7HvtJyi5NDn9xwOQiXULZV/VOlvP94DGBLIKCM/6dn 4QvZxpG0P0uOlpCgRAVLyh/z7g4XY4VF/fHopLCmEcqLsvgD+V2LQpQ9zWUalLPC Z+pUpz2vu0gIddPU1nR8R6oGpEdJ8O12aJle62p/RSXWZGx12qUQ+Tamu0tgKcv1 AsiJfbUGNDYfxgU6sHsoQjl2f68LTVckCU1C1LqEbW/S104EIORtGx30CHM4LRiO 32kDC5TtgYDBKQAIqJ4bL48ZMh+9W3uX40p7xzOI5khHQjvswUKa3jcxupU0C1uv lx8KXo7pn8WT33QGysWC782wJCgJuzSc2vRn+KQoqoynuHGM6agaEtR59gil3QWO rQEcxH63BBRDgHlg4FM9IkJwwsnC3PWKL8gbX0uAWXAPMbgapJkuuGZAwt0WDGVK +GszxsFkCjlW0mK0egTb =tiSY -----END PGP SIGNATURE----- Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull module update from Rusty Russell: "The sweeping change is to make add_taint() explicitly indicate whether to disable lockdep, but it's a mechanical change." * tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: MODSIGN: Add option to not sign modules during modules_install MODSIGN: Add -s <signature> option to sign-file MODSIGN: Specify the hash algorithm on sign-file command line MODSIGN: Simplify Makefile with a Kconfig helper module: clean up load_module a little more. modpost: Ignore ARC specific non-alloc sections module: constify within_module_* taint: add explicit flag to show whether lock dep is still OK. module: printk message when module signature fail taints kernel.
101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
/*
|
|
* custom_method.c - debugfs interface for customizing ACPI control method
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/debugfs.h>
|
|
#include <acpi/acpi_drivers.h>
|
|
|
|
#include "internal.h"
|
|
|
|
#define _COMPONENT ACPI_SYSTEM_COMPONENT
|
|
ACPI_MODULE_NAME("custom_method");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct dentry *cm_dentry;
|
|
|
|
/* /sys/kernel/debug/acpi/custom_method */
|
|
|
|
static ssize_t cm_write(struct file *file, const char __user * user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
static char *buf;
|
|
static u32 max_size;
|
|
static u32 uncopied_bytes;
|
|
|
|
struct acpi_table_header table;
|
|
acpi_status status;
|
|
|
|
if (!(*ppos)) {
|
|
/* parse the table header to get the table length */
|
|
if (count <= sizeof(struct acpi_table_header))
|
|
return -EINVAL;
|
|
if (copy_from_user(&table, user_buf,
|
|
sizeof(struct acpi_table_header)))
|
|
return -EFAULT;
|
|
uncopied_bytes = max_size = table.length;
|
|
buf = kzalloc(max_size, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (buf == NULL)
|
|
return -EINVAL;
|
|
|
|
if ((*ppos > max_size) ||
|
|
(*ppos + count > max_size) ||
|
|
(*ppos + count < count) ||
|
|
(count > uncopied_bytes))
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(buf + (*ppos), user_buf, count)) {
|
|
kfree(buf);
|
|
buf = NULL;
|
|
return -EFAULT;
|
|
}
|
|
|
|
uncopied_bytes -= count;
|
|
*ppos += count;
|
|
|
|
if (!uncopied_bytes) {
|
|
status = acpi_install_method(buf);
|
|
kfree(buf);
|
|
buf = NULL;
|
|
if (ACPI_FAILURE(status))
|
|
return -EINVAL;
|
|
add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations cm_fops = {
|
|
.write = cm_write,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static int __init acpi_custom_method_init(void)
|
|
{
|
|
if (acpi_debugfs_dir == NULL)
|
|
return -ENOENT;
|
|
|
|
cm_dentry = debugfs_create_file("custom_method", S_IWUSR,
|
|
acpi_debugfs_dir, NULL, &cm_fops);
|
|
if (cm_dentry == NULL)
|
|
return -ENODEV;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit acpi_custom_method_exit(void)
|
|
{
|
|
if (cm_dentry)
|
|
debugfs_remove(cm_dentry);
|
|
}
|
|
|
|
module_init(acpi_custom_method_init);
|
|
module_exit(acpi_custom_method_exit);
|