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SubjectSuspend 2 merge: 29/51: Clear swapfile bdev in swapoff.
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Suspend uses the bdev field as its means of telling which swap devices
are in use. (This info needs to be used at resume time without actually
doing the swapon[s] again). In order to avoid an oops in the suspend
code if the user turns off a swap device, this small addition is
necessary. (If you want the long explanation, feel free to ask!)

diff -ruN 816-clear-swapfile-bdev-in-swapoff-old/mm/swapfile.c 816-clear-swapfile-bdev-in-swapoff-new/mm/swapfile.c
--- 816-clear-swapfile-bdev-in-swapoff-old/mm/swapfile.c 2004-11-06 09:26:59.372699648 +1100
+++ 816-clear-swapfile-bdev-in-swapoff-new/mm/swapfile.c 2004-11-04 16:27:41.000000000 +1100
@@ -1179,6 +1179,7 @@
swap_file = p->swap_file;
p->swap_file = NULL;
p->max = 0;
+ p->bdev = NULL;
swap_map = p->swap_map;
p->swap_map = NULL;
p->flags = 0;

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