1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c
index 27adb090bb30..ef98796b3824 100644
--- a/drivers/acpi/proc.c
+++ b/drivers/acpi/proc.c
@@ -362,16 +362,13 @@ acpi_system_write_wakeup_device(struct file *file,
         struct list_head *node, *next;
         char strbuf[5];
         char str[5] = "";
-        unsigned int len = count;
 
-        if (len > 4)
-                len = 4;
-        if (len < 0)
-                return -EFAULT;
+        if (count > 4)
+                count = 4;
 
-        if (copy_from_user(strbuf, buffer, len))
+        if (copy_from_user(strbuf, buffer, count))
                 return -EFAULT;
-        strbuf[len] = '\0';
+        strbuf[count] = '\0';
         sscanf(strbuf, "%s", str);
 
         mutex_lock(&acpi_device_lock);