linux-2.4.20-ioperm.patch

   1 --- linux-2.4.20-gw3/arch/i386/kernel/ioport.c  2003-05-16 23:42:47.000000000 +0100
   2 +++ linux-2.4.20-gw4/arch/i386/kernel/ioport.c  2003-05-16 23:42:49.000000000 +0100
   3 @@ -72,17 +72,18 @@
   4                  */
   5                 memset(t->io_bitmap,0xff,(IO_BITMAP_SIZE+1)*4);
   6                 t->ioperm = 1;
   7 -               /*
   8 -                * this activates it in the TSS
   9 -                */
  10 -               tss->bitmap = IO_BITMAP_OFFSET;
  11         }
  12
  13         /*
  14          * do it in the per-thread copy and in the TSS ...
  15          */
  16         set_bitmap(t->io_bitmap, from, num, !turn_on);
  17 -       set_bitmap(tss->io_bitmap, from, num, !turn_on);
  18 +       if (tss->bitmap == IO_BITMAP_OFFSET) { /* already active? */
  19 +               set_bitmap(tss->io_bitmap, from, num, !turn_on);
  20 +       } else {
  21 +               memcpy(tss->io_bitmap, t->io_bitmap, IO_BITMAP_SIZE);
  22 +               tss->bitmap = IO_BITMAP_OFFSET; /* Activate it in the TSS */
  23 +       }
  24
  25         return 0;
  26  }