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-rw-r--r--arch/x86/kernel/ioport.c20
1 files changed, 5 insertions, 15 deletions
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 8eec0ec59af2..8c968974253d 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -14,22 +14,9 @@
14#include <linux/slab.h> 14#include <linux/slab.h>
15#include <linux/thread_info.h> 15#include <linux/thread_info.h>
16#include <linux/syscalls.h> 16#include <linux/syscalls.h>
17#include <linux/bitmap.h>
17#include <asm/syscalls.h> 18#include <asm/syscalls.h>
18 19
19/* Set EXTENT bits starting at BASE in BITMAP to value TURN_ON. */
20static void set_bitmap(unsigned long *bitmap, unsigned int base,
21 unsigned int extent, int new_value)
22{
23 unsigned int i;
24
25 for (i = base; i < base + extent; i++) {
26 if (new_value)
27 __set_bit(i, bitmap);
28 else
29 __clear_bit(i, bitmap);
30 }
31}
32
33/* 20/*
34 * this changes the io permissions bitmap in the current task. 21 * this changes the io permissions bitmap in the current task.
35 */ 22 */
@@ -69,7 +56,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
69 */ 56 */
70 tss = &per_cpu(init_tss, get_cpu()); 57 tss = &per_cpu(init_tss, get_cpu());
71 58
72 set_bitmap(t->io_bitmap_ptr, from, num, !turn_on); 59 if (turn_on)
60 bitmap_clear(t->io_bitmap_ptr, from, num);
61 else
62 bitmap_set(t->io_bitmap_ptr, from, num);
73 63
74 /* 64 /*
75 * Search for a (possibly new) maximum. This is simple and stupid, 65 * Search for a (possibly new) maximum. This is simple and stupid,