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Merge branch 'procfs-cleanup' into release
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,93 @@ | ||
/* | ||
* debugfs.c - ACPI debugfs interface to userspace. | ||
*/ | ||
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#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> | ||
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#define _COMPONENT ACPI_SYSTEM_COMPONENT | ||
ACPI_MODULE_NAME("debugfs"); | ||
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/* /sys/modules/acpi/parameters/aml_debug_output */ | ||
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module_param_named(aml_debug_output, acpi_gbl_enable_aml_debug_object, | ||
bool, 0644); | ||
MODULE_PARM_DESC(aml_debug_output, | ||
"To enable/disable the ACPI Debug Object output."); | ||
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/* /sys/kernel/debug/acpi/custom_method */ | ||
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static ssize_t cm_write(struct file *file, const char __user * user_buf, | ||
size_t count, loff_t *ppos) | ||
{ | ||
static char *buf; | ||
static int uncopied_bytes; | ||
struct acpi_table_header table; | ||
acpi_status status; | ||
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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 = table.length; | ||
buf = kzalloc(uncopied_bytes, GFP_KERNEL); | ||
if (!buf) | ||
return -ENOMEM; | ||
} | ||
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if (uncopied_bytes < count) { | ||
kfree(buf); | ||
return -EINVAL; | ||
} | ||
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if (copy_from_user(buf + (*ppos), user_buf, count)) { | ||
kfree(buf); | ||
return -EFAULT; | ||
} | ||
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uncopied_bytes -= count; | ||
*ppos += count; | ||
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if (!uncopied_bytes) { | ||
status = acpi_install_method(buf); | ||
kfree(buf); | ||
if (ACPI_FAILURE(status)) | ||
return -EINVAL; | ||
add_taint(TAINT_OVERRIDDEN_ACPI_TABLE); | ||
} | ||
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return count; | ||
} | ||
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static const struct file_operations cm_fops = { | ||
.write = cm_write, | ||
}; | ||
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int __init acpi_debugfs_init(void) | ||
{ | ||
struct dentry *acpi_dir, *cm_dentry; | ||
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acpi_dir = debugfs_create_dir("acpi", NULL); | ||
if (!acpi_dir) | ||
goto err; | ||
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cm_dentry = debugfs_create_file("custom_method", S_IWUGO, | ||
acpi_dir, NULL, &cm_fops); | ||
if (!cm_dentry) | ||
goto err; | ||
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return 0; | ||
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err: | ||
if (acpi_dir) | ||
debugfs_remove(acpi_dir); | ||
return -EINVAL; | ||
} |
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