PM/hibernate swapfile regression

[Heiko Carstens]

We've seen this bug:

Jul  8 13:16:02 h05lp03 kernel: BUG: sleeping function called from invalid context at /home/autobuild/BUILD/linux-2.6.30-20090707/include/linux/writeback.h:87
Jul  8 13:16:02 h05lp03 kernel: in_atomic(): 1, irqs_disabled(): 0, pid: 24377, name: bash
Jul  8 13:16:02 h05lp03 kernel: 3 locks held by bash/24377:
Jul  8 13:16:02 h05lp03 kernel: #0:  (&buffer->mutex){+.+.+.}, at: [<0000000000276e74>] sysfs_write_file+0x4c/0x1ac
Jul  8 13:16:02 h05lp03 kernel: #1:  (pm_mutex#2){+.+.+.}, at: [<000000000018f128>] hibernate+0x34/0x200
Jul  8 13:16:02 h05lp03 kernel: #2:  (swap_lock){+.+.-.}, at: [<00000000001f371c>] swap_type_of+0x44/0x158
Jul  8 13:16:02 h05lp03 kernel: CPU: 8 Not tainted 2.6.30-39.x.20090707-s390xdefault #1
Jul  8 13:16:02 h05lp03 kernel: Process bash (pid: 24377, task: 000000012ce84240, ksp: 00000000c262bb00)
Jul  8 13:16:02 h05lp03 kernel: 0000000000000000 00000000c262ba88 0000000000000002 0000000000000000
Jul  8 13:16:02 h05lp03 kernel:       00000000c262bb28 00000000c262baa0 00000000c262baa0 00000000005448c4
Jul  8 13:16:02 h05lp03 kernel:       0000000000000000 000000012ce84718 000000013d5bf1a8 0000000000000000
Jul  8 13:16:02 h05lp03 kernel:       000000000000000d 0000000000000000 00000000c262baf8 000000000000000e
Jul  8 13:16:02 h05lp03 kernel:       0000000000553da8 0000000000105600 00000000c262ba88 00000000c262bad0
Jul  8 13:16:02 h05lp03 kernel: Call Trace:
Jul  8 13:16:02 h05lp03 kernel: ([<00000000001054fc>] show_trace+0xf0/0x148)
Jul  8 13:16:02 h05lp03 kernel: [<00000000001391ba>] __might_sleep+0x172/0x188
Jul  8 13:16:02 h05lp03 kernel: [<000000000021f738>] ifind+0x88/0xe4
Jul  8 13:16:02 h05lp03 kernel: [<0000000000220b0e>] iget5_locked+0x66/0x1d8
Jul  8 13:16:02 h05lp03 kernel: [<000000000023b676>] bdget+0x5e/0x150
Jul  8 13:16:02 h05lp03 kernel: [<00000000001f37b2>] swap_type_of+0xda/0x158
Jul  8 13:16:02 h05lp03 kernel: [<0000000000192342>] swsusp_write+0x4e/0x458
Jul  8 13:16:02 h05lp03 kernel: [<000000000018f254>] hibernate+0x160/0x200
Jul  8 13:16:02 h05lp03 kernel: [<000000000018d8da>] state_store+0x82/0xa8
Jul  8 13:16:02 h05lp03 kernel: [<0000000000276f20>] sysfs_write_file+0xf8/0x1ac
Jul  8 13:16:02 h05lp03 kernel: [<000000000020663a>] vfs_write+0xae/0x15c
Jul  8 13:16:02 h05lp03 kernel: [<00000000002067e0>] SyS_write+0x54/0xac
Jul  8 13:16:02 h05lp03 kernel: [<0000000000117a96>] sysc_noemu+0x10/0x16
Jul  8 13:16:02 h05lp03 kernel: [<00000047083e36b4>] 0x47083e36b4

Looks like this was introduced with git commit a1bb7d61 "PM/hibernate: fix "swap
breaks after hibernation failures"".
Calling bdget while holding a spinlock doesn't seem to be a good idea...
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