[    1.973959] Unable to handle kernel NULL pointer dereference at virtual address 00000050
[    1.981807] pgd = 80004000
[    1.984496] [00000050] *pgd=00000000
[    1.988056] Internal error: Oops: 5 [#1] SMP ARM
[    1.992651] Modules linked in:
[    1.995689] CPU: 1 PID: 71 Comm: spi2 Not tainted 3.16.0-rc5-next-20140718-00021-ga43ca5e #451
[    2.004276] task: de5bd400 ti: de63c000 task.ti: de63c000
[    2.009657] PC is at dma_pl330_rqcb.isra.2+0x14/0x64
[    2.014599] LR is at pl330_release_channel.part.3+0x34/0xa8
[    2.020151] pc : [<8027b140>]    lr : [<8027b5f8>]    psr: 60000193
[    2.020151] sp : de63de48  ip : de63de68  fp : de63de64
[    2.031601] r10: 00000000  r9 : 00000000  r8 : 00000000
[    2.036806] r7 : de4eb270  r6 : 60000113  r5 : 0000000c  r4 : de5dd000
[    2.043312] r3 : de5dd000  r2 : 00000000  r1 : 00020001  r0 : 00000000
[    2.049819] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[    2.057192] Control: 10c5387d  Table: 4000406a  DAC: 00000015
[    2.062918] Process spi2 (pid: 71, stack limit = 0xde63c248)
[    2.068556] Stack: (0xde63de48 to 0xde63e000)
[    2.072896] de40:                   de5dd000 de5dd000 0000000c 60000113 de63de7c de63de68
[    2.081050] de60: 8027b5f8 8027b138 de499300 de49935c de63de9c de63de80 8027b6bc 8027b5d0
[    2.089204] de80: 8027b66c de499314 de4eb000 00000000 de63deb4 de63dea0 80278c94 8027b678
[    2.097359] dea0: 00000001 de499314 de63decc de63deb8 80278cf4 80278c44 de4eb2e8 de4eb000
[    2.105513] dec0: de63dee4 de63ded0 802f0220 80278ca4 802f01f0 de4eb248 de63df1c de63dee8
[    2.113668] dee0: 802eee8c 802f01fc de4eb224 de4eb248 de63c000 de4eb224 de4eb248 de63c000
[    2.121822] df00: de63c000 00000000 00000000 00000000 de63df44 de63df20 8003c810 802eee04
[    2.129977] df20: 00000000 de613b00 00000000 de4eb224 8003c72c 00000000 de63dfac de63df48
[    2.138131] df40: 8003ca90 8003c738 decdbc00 00000000 de63df6c de4eb224 00000000 00000000
[    2.146286] df60: dead4ead ffffffff ffffffff de63df6c de63df6c 00000000 00000000 dead4ead
[    2.154440] df80: ffffffff ffffffff de63df88 de63df88 de613b00 8003c998 00000000 00000000
[    2.162595] dfa0: 00000000 de63dfb0 8000e3d8 8003c9a4 00000000 00000000 00000000 00000000
[    2.170749] dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    2.178904] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
[    2.187067] [<8027b140>] (dma_pl330_rqcb.isra.2) from [<8027b5f8>] (pl330_release_channel.part.3+0x34/0xa8)
[    2.196776] [<8027b5f8>] (pl330_release_channel.part.3) from [<8027b6bc>] (pl330_free_chan_resources+0x50/0xac)
[    2.206839] [<8027b6bc>] (pl330_free_chan_resources) from [<80278c94>] (dma_chan_put+0x5c/0x60)
[    2.215513] [<80278c94>] (dma_chan_put) from [<80278cf4>] (dma_release_channel+0x5c/0xa0)
[    2.223676] [<80278cf4>] (dma_release_channel) from [<802f0220>] (s3c64xx_spi_unprepare_transfer+0x30/0x50)
[    2.233387] [<802f0220>] (s3c64xx_spi_unprepare_transfer) from [<802eee8c>] (spi_pump_messages+0x94/0x534)
[    2.243018] [<802eee8c>] (spi_pump_messages) from [<8003c810>] (kthread_worker_fn+0xe4/0x144)
[    2.251516] [<8003c810>] (kthread_worker_fn) from [<8003ca90>] (kthread+0xf8/0x10c)
[    2.259153] [<8003ca90>] (kthread) from [<8000e3d8>] (ret_from_fork+0x14/0x20)
[    2.266350] Code: e92dd878 e24cb004 e92d4000 e8bd4000 (e5904050)
[    2.272436] ---[ end trace 30023402b522a7ab ]---