[PATCH] powerpc/fsl-pci:fix incorrect iounmap pci hose->private_data

[Zang Roy-R61911]

> -----Original Message-----
> From: Zang Roy-R61911
> Sent: Tuesday, April 23, 2013 2:36 AM
> To: linuxppc-dev at lists.ozlabs.org
> Cc: galak at kernel.crashing.org; Zang Roy-R61911; Chen Yuanquan-B41889
> Subject: [PATCH] powerpc/fsl-pci:fix incorrect iounmap pci hose-
> >private_data
> 
> pci hose->private_data will be used by other function, for example,
> fsl_pcie_check_link(), so do not iounmap it.
> 
> fix the kerenl crash on T4240:
> 
> Unable to handle kernel paging request for data at address
> 0x8000080080060f14
> Faulting instruction address: 0xc000000000032554
> Oops: Kernel access of bad area, sig: 11 [#1] SMP NR_CPUS=24 T4240 QDS
> Modules linked in:
> NIP: c000000000032554 LR: c00000000003254c CTR: c00000000001e5c0
> REGS: c000000179143440 TRAP: 0300   Not tainted
> (3.8.8-rt2-00754-g951f064-dirt)
> MSR: 0000000080029000 <CE,EE,ME>  CR: 24adbe22  XER: 00000000
> SOFTE: 0
> DEAR: 8000080080060f14, ESR: 0000000000000000 TASK = c00000017913d2c0[1]
> 'swapper/0' THREAD: c000000179140000 CPU: 2
> GPR00: c00000000003254c c0000001791436c0 c000000000ae2998
> 0000000000000027
> GPR04: 0000000000000000 00000000000005a5 0000000000000000
> 0000000000000002
> GPR08: 3030303038303038 c000000000a2d4d0 c000000000aebeb8
> c000000000af2998
> GPR12: 0000000024adbe22 c00000000fffa800 c000000000001be0
> 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000
> 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000
> c0000000009ddf70
> GPR24: c0000000009e8d40 c000000000af2998 c000000000b1529c
> c000000179143b40
> GPR28: c0000001799b4000 c000000179143c00 8000080080060000
> c000000000727ec8
> NIP [c000000000032554] .fsl_pcie_check_link+0x104/0x150 LR
> [c00000000003254c] .fsl_pcie_check_link+0xfc/0x150 Call Trace:
> [c0000001791436c0] [c00000000003254c] .fsl_pcie_check_link+0xfc/0x150
> (unreliab)
> [c000000179143a30] [c0000000000325d4]
> .fsl_indirect_read_config+0x34/0xb0
> [c000000179143ad0] [c0000000002c7ee8]
> .pci_bus_read_config_byte+0x88/0xd0
> [c000000179143b90] [c0000000009c0528] .pci_apply_final_quirks+0x9c/0x18c
> [c000000179143c40] [c00000000000142c] .do_one_initcall+0x5c/0x1f0
> [c000000179143cf0] [c0000000009a0bb4] .kernel_init_freeable+0x180/0x264
> [c000000179143db0] [c000000000001bfc] .kernel_init+0x1c/0x420
> [c000000179143e30] [c0000000000008b4] .ret_from_kernel_thread+0x64/0xb0
> Instruction dump:
> 60000000 4bffffa0 ebc301d0 3fe2ffc4 3c62ffe0 3bff5530 38638a78 7fe4fb78
> 7fc5f378 486ea77d 60000000 7c0004ac <801e0f14> 0c000000 4c00012c 3c62ffe0
> ---[ end trace f841fbc03c9d2e1b ]---
> 
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> 
> Rebooting in 180 seconds..
> 
> Signed-off-by: Yuanquan Chen <Yuanquan.Chen at freescale.com>
> Signed-off-by: Roy Zang <tie-fei.zang at freescale.com>
> ---
> based on Kumar's next branch.
> tested on P3041 and T4240.
Please ignore this patch, I will send a v2 version.
Thanks.
Roy