Properly initialize the IO bitmap in the TSS on the first ioperm() call.
-- Brian Gerst
diff -urN linux-2.5.64-bk5/arch/i386/kernel/ioport.c linux/arch/i386/kernel/ioport.c --- linux-2.5.64-bk5/arch/i386/kernel/ioport.c 2003-02-24 14:59:03.000000000 -0500 +++ linux/arch/i386/kernel/ioport.c 2003-03-14 10:19:48.000000000 -0500 @@ -84,15 +84,17 @@ t->ts_io_bitmap = bitmap; } - tss = init_tss + get_cpu(); - if (bitmap) - tss->bitmap = IO_BITMAP_OFFSET; /* Activate it in the TSS */ - /* * do it in the per-thread copy and in the TSS ... */ set_bitmap(t->ts_io_bitmap, from, num, !turn_on); - set_bitmap(tss->io_bitmap, from, num, !turn_on); + tss = init_tss + get_cpu(); + if (tss->bitmap == IO_BITMAP_OFFSET) { /* already active? */ + set_bitmap(tss->io_bitmap, from, num, !turn_on); + } else { + memcpy(tss->io_bitmap, t->ts_io_bitmap, IO_BITMAP_BYTES); + tss->bitmap = IO_BITMAP_OFFSET; /* Activate it in the TSS */ + } put_cpu(); out: return ret;
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