From: "Rajanikanth H.V" rajanikanth.hv@stericsson.com
Power supply subsystem creates thermal zone device for the property 'POWER_SUPPLY_PROP_TEMP' which requires thermal subsystem to be ready before 'ab8500 battery temperature monitor' driver is initialized. ab8500 btemp driver is initialized with subsys_initcall whereas thermal subsystem is initialized with fs_initcall which causes thermal_zone_device_register(...) to crash since the required structure 'thermal_class' is not initialized yet.
crash log: =================================================================== Unable to handle kernel NULL pointer dereference at virtual address 000000a4 pgd = c0004000 [000000a4] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 Tainted: G W (3.8.0-rc4-00001-g632fda8-dirty #1) PC is at _raw_spin_lock+0x18/0x54 LR is at get_device_parent+0x50/0x1b8 pc : [<c02f1dd0>] lr : [<c01cb248>] psr: 60000013 sp : ef04bdc8 ip : 00000000 fp : c0446180 r10: ef216e38 r9 : c03af5d0 r8 : ef275c18 r7 : 00000000 r6 : c0476c14 r5 : ef275c18 r4 : ef095840 r3 : ef04a000 r2 : 00000001 r1 : 00000000 r0 : 000000a4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c5787d Table: 0000404a DAC: 00000015 Process swapper/0 (pid: 1, stack limit = 0xef04a238) Stack: (0xef04bdc8 to 0xef04c000) bdc0: ef275c18 00000000 00000000 c01cb8d8 00000000 ef275c18 bde0: ef275c80 00000000 c0446180 c01d3edc ef275c18 ef275c00 00000000 00000000 be00: c03af5d0 ef275c18 c03af5d0 ef216e38 c0446180 c020b91c 00000000 ef275c04 be20: ef04be48 ef1ad000 ef216e38 ef1ad000 ef216e38 00000000 ef1b9010 00000002 be40: c03af5d0 00000000 c0446058 c0202030 c0445400 00000000 00000000 00000000 be60: ef216e10 ef1b9000 c04457f4 c02055ec 00000000 c01d57ac ef216e38 ef037a00 be80: ef181fc0 00000000 ef1b9010 c0476c38 ef1b9010 ef1b9044 c0446008 c041bbb0 bea0: c044d940 ef04a000 c0414b68 c01cf0dc c01cf0c8 c01cde70 00000000 ef1b9010 bec0: c0446008 ef1b9044 00000000 c01ce094 00000000 c0446008 c01ce008 c01cc640 bee0: ef032258 ef180334 ef222f00 c0446008 c0441778 c01cd6b4 c03ab170 c0446008 bf00: c0446008 c041bbd0 00000005 c044d940 c041bbb0 c01ce54c 00000000 c0422988 bf20: c041bbd0 00000005 c044d940 c041bbb0 ef04a000 c00086ac 00000049 c00360cc bf40: ef04bf6c 00000000 c0388c34 c03e1a78 00000004 00000004 c0436998 c0422988 bf60: c041bbd0 00000005 c044d940 c041bbb0 c040027c 00000049 00000000 c02e89c8 bf80: 00000004 00000004 c040027c c0c88340 00000000 c02e88a8 00000000 00000000 bfa0: 00000000 00000000 00000000 c000e358 00000000 00000000 00000000 00000000 bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 80800004 00304600 [<c02f1dd0>] (_raw_spin_lock+0x18/0x54) from [<c01cb248>] (get_device_parent+0x50/0x1b8) [<c01cb248>] (get_device_parent+0x50/0x1b8) from [<c01cb8d8>] (device_add+0xa4/0x574) [<c01cb8d8>] (device_add+0xa4/0x574) from [<c020b91c>] (thermal_zone_device_register+0x118/0x938) [<c020b91c>] (thermal_zone_device_register+0x118/0x938) from [<c0202030>] (power_supply_register+0x170/0x1f8) [<c0202030>] (power_supply_register+0x170/0x1f8) from [<c02055ec>] (ab8500_btemp_probe+0x208/0x47c) [<c02055ec>] (ab8500_btemp_probe+0x208/0x47c) from [<c01cf0dc>] (platform_drv_probe+0x14/0x18) [<c01cf0dc>] (platform_drv_probe+0x14/0x18) from [<c01cde70>] (driver_probe_device+0x74/0x20c) [<c01cde70>] (driver_probe_device+0x74/0x20c) from [<c01ce094>] (__driver_attach+0x8c/0x90) [<c01ce094>] (__driver_attach+0x8c/0x90) from [<c01cc640>] (bus_for_each_dev+0x4c/0x80) [<c01cc640>] (bus_for_each_dev+0x4c/0x80) from [<c01cd6b4>] (bus_add_driver+0x16c/0x23c) [<c01cd6b4>] (bus_add_driver+0x16c/0x23c) from [<c01ce54c>] (driver_register+0x78/0x14c) [<c01ce54c>] (driver_register+0x78/0x14c) from [<c00086ac>] (do_one_initcall+0xfc/0x164) [<c00086ac>] (do_one_initcall+0xfc/0x164) from [<c02e89c8>] (kernel_init+0x120/0x2b8) [<c02e89c8>] (kernel_init+0x120/0x2b8) from [<c000e358>] (ret_from_fork+0x14/0x3c) Code: e3c3303f e5932004 e2822001 e5832004 (e1903f9f) ---[ end trace ed9df72941b5bada ]--- ===================================================================
Signed-off-by: Rajanikanth H.V rajanikanth.hv@stericsson.com --- drivers/power/ab8500_btemp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/power/ab8500_btemp.c b/drivers/power/ab8500_btemp.c index 20e2a7d..056222e 100644 --- a/drivers/power/ab8500_btemp.c +++ b/drivers/power/ab8500_btemp.c @@ -1123,7 +1123,7 @@ static void __exit ab8500_btemp_exit(void) platform_driver_unregister(&ab8500_btemp_driver); }
-subsys_initcall_sync(ab8500_btemp_init); +device_initcall(ab8500_btemp_init); module_exit(ab8500_btemp_exit);
MODULE_LICENSE("GPL v2");