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Subject[PATCH] ioperm() fix
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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