** Description changed:

+ SRU Justification:
+ 
+     Impact: kernel panic on boot
+     Fix: see attached patch.
+     Testcase: boot the board and see if it panics or not.
+ 
+ ===
+ 
  Observed on a random boot (just once, so far):
  [    6.273265] Unable to handle kernel paging request at virtual address 
fffffffc
  [    6.280488] pgd = ec074000
  [    6.283187] [fffffffc] *pgd=2e7f5821, *pte=00000000, *ppte=00000000
  [    6.289458] Internal error: Oops: 17 [#1] SMP ARM
  [    6.294156] Modules linked in: pl330(F+) rtc_pl031(F)
  [    6.299233] CPU: 0    Tainted: GF       W     (3.8.0-17-generic #27-Ubuntu)
  [    6.306204] PC is at pl330_irq_handler+0x21c/0x3b0 [pl330]
  [    6.311699] LR is at l2x0_cache_sync+0x50/0x54
  [    6.316141] pc : [<bf0067a8>]    lr : [<c0026940>]    psr: 60000193
  [    6.316141] sp : edf07e98  ip : edf07e80  fp : edf07edc
  [    6.327616] r10: 00000001  r9 : 00000001  r8 : edc40480
  [    6.332840] r7 : 00000001  r6 : f00a0000  r5 : edc40480  r4 : 00000000
  [    6.339361] r3 : ffffffc8  r2 : fffffff9  r1 : 00000001  r0 : 00000000
  [    6.345884] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment 
user
  [    6.353101] Control: 10c5387d  Table: 2c07404a  DAC: 00000015
  [    6.358843] Process upstart-udev-br (pid: 318, stack limit = 0xedf06238)
  [    6.365540] Stack: (0xedf07e98 to 0xedf08000)
  [    6.369902] 7e80:                                                       
c04d54e4 c00268fc
  [    6.378081] 7ea0: ffff6d21 a0000193 edc40484 edc40840 00000000 edd2d380 
ed80be90 0000007c
  [    6.386259] 7ec0: 00000000 00000000 0000006f c0a5dae0 edf07f1c edf07ee0 
c00ce5bc bf006598
  [    6.394432] 7ee0: 00000001 c007147c edf07f14 ed80be40 edf07f14 ed80be40 
ed80be90 00000000
  [    6.402602] 7f00: f0002100 00000000 0000006f bece99c0 edf07f3c edf07f20 
c00ce7ec c00ce568
  [    6.410772] 7f20: 00000000 ed80be40 ed80be90 00000000 edf07f54 edf07f40 
c00d1a14 c00ce798
  [    6.418942] 7f40: 0000007c 0000007c edf07f6c edf07f58 c00cdee0 c00d1994 
000000a0 c09b8690
  [    6.427112] 7f60: edf07f8c edf07f70 c00154d0 c00cdebc 00000010 f000210c 
c09c2524 edf07fb0
  [    6.435282] 7f80: edf07fac edf07f90 c0008578 c0015494 b6ea91c0 000f0030 
ffffffff 00000007
  [    6.443451] 7fa0: 00000000 edf07fb0 c0654f00 c000854c bece98d8 bece98d4 
00000001 00000009
  [    6.451621] 7fc0: bece9988 00000010 bece98e8 00000007 00000000 0000006f 
bece99c0 bece9908
  [    6.459791] 7fe0: 00000000 bece98c8 b6e9a37b b6ea91c0 000f0030 ffffffff 
00000000 00000000
  [    6.467988] [<bf0067a8>] (pl330_irq_handler+0x21c/0x3b0 [pl330]) from 
[<c00ce5bc>] (handle_irq_event_percpu+0x60/0x230)
  [    6.478768] [<c00ce5bc>] (handle_irq_event_percpu+0x60/0x230) from 
[<c00ce7ec>] (handle_irq_event+0x60/0x80)
  [    6.488592] [<c00ce7ec>] (handle_irq_event+0x60/0x80) from [<c00d1a14>] 
(handle_fasteoi_irq+0x8c/0x164)
  [    6.497980] [<c00d1a14>] (handle_fasteoi_irq+0x8c/0x164) from [<c00cdee0>] 
(generic_handle_irq+0x30/0x40)
  [    6.507544] [<c00cdee0>] (generic_handle_irq+0x30/0x40) from [<c00154d0>] 
(handle_IRQ+0x48/0xa4)
  [    6.516325] [<c00154d0>] (handle_IRQ+0x48/0xa4) from [<c0008578>] 
(gic_handle_irq+0x38/0x6c)
  [    6.524764] [<c0008578>] (gic_handle_irq+0x38/0x6c) from [<c0654f00>] 
(__irq_usr+0x40/0x60)
  [    6.533104] Exception stack(0xedf07fb0 to 0xedf07ff8)
  [    6.538147] 7fa0:                                     bece98d8 bece98d4 
00000001 00000009
  [    6.546317] 7fc0: bece9988 00000010 bece98e8 00000007 00000000 0000006f 
bece99c0 bece9908
  [    6.554486] 7fe0: 00000000 bece98c8 b6e9a37b b6ea91c0 000f0030 ffffffff
  [    6.561097] Code: e3a01001 e5980098 e0622182 e0803182 (e593e034)
  [    6.567187] ---[ end trace da227214a82491ba ]---
  [    6.571796] Kernel panic - not syncing: Fatal exception in interrupt

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https://bugs.launchpad.net/bugs/1166956

Title:
  [highbank] Oops:  PC is at pl330_irq_handler+0x21c/0x3b0 [pl330]

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