The suspend/resume test on imx51-babbage board discovers a kernel Oops caused by sgtl5000_resume(). I believe it happens due to commit e5d80e82e32e (ASoC: sgtl5000: Convert to use regmap directly). After the commit, it seems that the codec->reg_cache in function sgtl5000_restore_regs() becomes invalid. It looks that the register restoring in the function requires some strict sequence, I'm not sure what the correct fix is.
Shawn
$ echo mem > /sys/power/state PM: Syncing filesystems ... done. PM: Preparing system for mem sleep Freezing user space processes ... (elapsed 0.006 seconds) done. Freezing remaining freezable tasks ... (elapsed 0.004 seconds) done. PM: Entering mem sleep PM: suspend of devices complete after 41.598 msecs PM: suspend devices took 0.050 seconds PM: late suspend of devices complete after 6.434 msecs PM: noirq suspend of devices complete after 6.735 msecs Disabling non-boot CPUs ... PM: noirq resume of devices complete after 10.871 msecs PM: early resume of devices complete after 5.241 msecs Unable to handle kernel NULL pointer dereference at virtual address 00000010 pgd = 80004000 [00000010] *pgd=00000000 Internal error: Oops: 17 [#1] SMP ARM Modules linked in: CPU: 0 PID: 21 Comm: kworker/0:1 Not tainted 3.15.0-rc3-00071-g49a96400a142-dirty #118 Workqueue: events soc_resume_deferred task: 9e11c440 ti: 9e14e000 task.ti: 9e14e000 PC is at sgtl5000_resume+0x7c/0x124 LR is at mark_held_locks+0x70/0x94 pc : [<804e8fb8>] lr : [<800661b8>] psr: 80000013 sp : 9e14fe40 ip : 80a26e60 fp : 9e14fe5c r10: 9fbd6b00 r9 : 00000001 r8 : 00000000 r7 : 00000010 r6 : 9e369a00 r5 : 00000002 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 9e369a00 Flags: Nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel Control: 10c5387d Table: ac828019 DAC: 00000015 Process kworker/0:1 (pid: 21, stack limit = 0x9e14e240) Stack: (0x9e14fe40 to 0x9e150000) fe40: 9e387d84 9e369a00 9e387c64 9e387da4 9e14fe84 9e14fe60 804d90d0 804e8f48 fe60: 9e135300 9e387d84 9fbd36c0 9e14e000 00000000 9fbd6b00 9e14fee4 9e14fe88 fe80: 8003f060 804d8fd0 00000001 00000000 8003efec 9fbd36c0 8003f620 00000000 fea0: 00000000 9e14fea8 80e981a0 80a26e60 00000000 80843dfc 80661fac 9e135300 fec0: 9fbd36f0 9e14e000 9e135318 9e14e000 9fbd36c0 8094e442 9e14ff24 9e14fee8 fee0: 8003f700 8003eec4 80662510 00000000 9e134ac0 9e14e000 8003f5dc 00000000 ff00: 9e134ac0 9e135300 8003f5dc 00000000 00000000 00000000 9e14ffac 9e14ff28 ff20: 800463bc 8003f5e8 800663bc 00000000 9e14ff54 9e135300 00000000 00000000 ff40: dead4ead ffffffff ffffffff 80952424 00000000 00000000 807cc28c 9e14ff5c ff60: 9e14ff5c 00000000 00000000 dead4ead ffffffff ffffffff 80952424 00000000 ff80: 00000000 807cc28c 9e14ff88 9e14ff88 9e134ac0 800462ec 00000000 00000000 ffa0: 00000000 9e14ffb0 8000eb68 800462f8 00000000 00000000 00000000 00000000 ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 00c37f70 76f142d0 Backtrace: [<804e8f3c>] (sgtl5000_resume) from [<804d90d0>] (soc_resume_deferred+0x10c/0x30c) r7:9e387da4 r6:9e387c64 r5:9e369a00 r4:9e387d84 [<804d8fc4>] (soc_resume_deferred) from [<8003f060>] (process_one_work+0x1a8/0x444) r10:9fbd6b00 r8:00000000 r7:9e14e000 r6:9fbd36c0 r5:9e387d84 r4:9e135300 [<8003eeb8>] (process_one_work) from [<8003f700>] (worker_thread+0x124/0x398) r10:8094e442 r9:9fbd36c0 r8:9e14e000 r7:9e135318 r6:9e14e000 r5:9fbd36f0 r4:9e135300 [<8003f5dc>] (worker_thread) from [<800463bc>] (kthread+0xd0/0xec) r10:00000000 r9:00000000 r8:00000000 r7:8003f5dc r6:9e135300 r5:9e134ac0 r4:00000000 [<800462ec>] (kthread) from [<8000eb68>] (ret_from_fork+0x14/0x2c) r7:00000000 r6:00000000 r5:800462ec r4:9e134ac0 Code: e1a03084 e1a01004 e1a00006 0afffff0 (e19720b3) ---[ end trace eeb2712470f0de34 ]--- Unable to handle kernel paging request at virtual address ffffffd0 pgd = 80004000 [ffffffd0] *pgd=afff6821, *pte=00000000, *ppte=00000000 Internal error: Oops: 17 [#2] SMP ARM Modules linked in: CPU: 0 PID: 21 Comm: kworker/0:1 Tainted: G D 3.15.0-rc3-00071-g49a96400a142-dirty #118 task: 9e11c440 ti: 9e14e000 task.ti: 9e14e000 PC is at kthread_data+0x10/0x18 LR is at wq_worker_sleeping+0x14/0xc8 pc : [<8004673c>] lr : [<8004047c>] psr: 00000193 sp : 9e14fb00 ip : 9e14fb10 fp : 9e14fb0c r10: 808f2d2c r9 : 9e11c698 r8 : 808e8c40 r7 : 00000000 r6 : 9e14e000 r5 : 9e11c440 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 9e11c440 Flags: nzcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user Control: 10c5387d Table: ac828019 DAC: 00000015 Process kworker/0:1 (pid: 21, stack limit = 0x9e14e240) Stack: (0x9e14fb00 to 0x9e150000) fb00: 9e14fb24 9e14fb10 8004047c 80046738 00000020 9fbd3c40 9e14fbc4 9e14fb28 fb20: 8065dd8c 80040474 9e14e000 60000113 9e14fb4c 9e14fb40 800663bc 800661e8 fb40: 9e14fb74 9e14fb50 808e8c40 808e8c40 9e11c440 9e1078c0 8094fe04 9e116100 fb60: 9e116604 9e11c440 9e14fb84 9e14fb78 800786f0 80078498 9e14fbd4 9e14fb88 fb80: 80029c60 800786e4 00000000 00000000 800299ec 9e11c438 808e7390 00000001 fba0: 9e11c438 9e11c440 9e11c438 9e14e000 9e11c614 9e068000 9e14fbd4 9e14fbc8 fbc0: 8065e114 8065da60 9e14fc0c 9e14fbd8 8002b088 8065e0e8 9e14e000 00000001 fbe0: 9e11c614 9e14fbf0 8094e944 9e11c65c 9e14fbf0 9e14fbf0 80028d90 808f760c fc00: 9e14fc8c 9e14fc10 80011ff4 8002aa90 9e14e240 0000000b 00000008 00000000 fc20: 00000000 60000113 65000001 33306131 20343830 30613165 34303031 61316520 fc40: 30303030 61302036 66666666 28203066 37393165 33623032 80002029 80659664 fc60: 80823f48 00000010 00000017 00000000 9e14fdf8 00000010 00000001 9e11c440 fc80: 9e14fca4 9e14fc90 80658498 80011dfc 9e14fdf8 00000017 9e14fd44 9e14fca8 fca0: 8001bcd8 80658448 00000037 00000000 9e14fccc 9e14fcc0 800613d0 800612f8 fcc0: 9e14fcf4 9e14fcd0 8007911c 800613c8 9fbd3c40 9e14e000 808e7ffc 9e14e000 fce0: 00000004 00000001 00000004 00000006 9e11c440 60000013 60000013 00000000 fd00: 9e14fd2c 9e14fd10 800661b8 80063254 9e14e000 80012928 9e11c440 00000017 fd20: 8001bb20 808f8314 00000010 9e14fdf8 00000001 9fbd6b00 9e14fdf4 9e14fd48 fd40: 8000840c 8001bb2c 800663bc 800661e8 9e14fe0c 9e14fd60 80012928 800663b4 fd60: 00000001 9e11c8a0 00000000 9e11c440 00000001 00000007 80903a24 80e3ea20 fd80: 60000013 60000013 00000000 9e14fe0c 80a26e60 9e14fda8 800661b8 8006d650 fda0: 20000013 ffffffff 00000000 00000000 00000000 00000000 80e3f308 00000007 fdc0: 60000013 80660be4 9e14fde4 00000000 00000000 804e8fb8 80000013 ffffffff fde0: 9e14fe2c 00000000 9e14fe5c 9e14fdf8 800128a4 800083dc 9e369a00 00000000 fe00: 00000000 00000000 00000000 00000002 9e369a00 00000010 00000000 00000001 fe20: 9fbd6b00 9e14fe5c 80a26e60 9e14fe40 800661b8 804e8fb8 80000013 ffffffff fe40: 9e387d84 9e369a00 9e387c64 9e387da4 9e14fe84 9e14fe60 804d90d0 804e8f48 fe60: 9e135300 9e387d84 9fbd36c0 9e14e000 00000000 9fbd6b00 9e14fee4 9e14fe88 fe80: 8003f060 804d8fd0 00000001 00000000 8003efec 9fbd36c0 8003f620 00000000 fea0: 00000000 9e14fea8 80e981a0 80a26e60 00000000 80843dfc 80661fac 9e135300 fec0: 9fbd36f0 9e14e000 9e135318 9e14e000 9fbd36c0 8094e442 9e14ff24 9e14fee8 fee0: 8003f700 8003eec4 80662510 00000000 9e134ac0 9e14e000 8003f5dc 00000000 ff00: 9e134ac0 9e135300 8003f5dc 00000000 00000000 00000000 9e14ffac 9e14ff28 ff20: 800463bc 8003f5e8 800663bc 00000000 9e14ff54 9e135300 00000000 00000000 ff40: dead4ead ffffffff ffffffff 80952424 00000000 00000000 807cc28c 9e14ff5c ff60: 9e14ff5c 00000001 00010001 dead4ead ffffffff ffffffff 80952424 00000000 ff80: 00000000 807cc28c 9e14ff88 9e14ff88 9e134ac0 800462ec 00000000 00000000 ffa0: 00000000 9e14ffb0 8000eb68 800462f8 00000000 00000000 00000000 00000000 ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 00c37f70 76f142d0 Backtrace: [<8004672c>] (kthread_data) from [<8004047c>] (wq_worker_sleeping+0x14/0xc8) [<80040468>] (wq_worker_sleeping) from [<8065dd8c>] (__schedule+0x338/0x5cc) r4:9fbd3c40 r3:00000020 [<8065da54>] (__schedule) from [<8065e114>] (schedule+0x38/0x88) r10:9e068000 r9:9e11c614 r8:9e14e000 r7:9e11c438 r6:9e11c440 r5:9e11c438 r4:00000001 [<8065e0dc>] (schedule) from [<8002b088>] (do_exit+0x604/0x8d8) [<8002aa84>] (do_exit) from [<80011ff4>] (die+0x204/0x3c0) r7:808f760c [<80011df0>] (die) from [<80658498>] (__do_kernel_fault.part.9+0x5c/0x7c) r10:9e11c440 r9:00000001 r8:00000010 r7:9e14fdf8 r6:00000000 r5:00000017 r4:00000010 [<8065843c>] (__do_kernel_fault.part.9) from [<8001bcd8>] (do_page_fault+0x1b8/0x3e4) r7:00000017 r3:9e14fdf8 [<8001bb20>] (do_page_fault) from [<8000840c>] (do_DataAbort+0x3c/0xa0) r10:9fbd6b00 r9:00000001 r8:9e14fdf8 r7:00000010 r6:808f8314 r5:8001bb20 r4:00000017 [<800083d0>] (do_DataAbort) from [<800128a4>] (__dabt_svc+0x44/0x80) Exception stack(0x9e14fdf8 to 0x9e14fe40) fde0: 9e369a00 00000000 fe00: 00000000 00000000 00000000 00000002 9e369a00 00000010 00000000 00000001 fe20: 9fbd6b00 9e14fe5c 80a26e60 9e14fe40 800661b8 804e8fb8 80000013 ffffffff r8:00000000 r7:9e14fe2c r6:ffffffff r5:80000013 r4:804e8fb8 [<804e8f3c>] (sgtl5000_resume) from [<804d90d0>] (soc_resume_deferred+0x10c/0x30c) r7:9e387da4 r6:9e387c64 r5:9e369a00 r4:9e387d84 [<804d8fc4>] (soc_resume_deferred) from [<8003f060>] (process_one_work+0x1a8/0x444) r10:9fbd6b00 r8:00000000 r7:9e14e000 r6:9fbd36c0 r5:9e387d84 r4:9e135300 [<8003eeb8>] (process_one_work) from [<8003f700>] (worker_thread+0x124/0x398) r10:8094e442 r9:9fbd36c0 r8:9e14e000 r7:9e135318 r6:9e14e000 r5:9fbd36f0 r4:9e135300 [<8003f5dc>] (worker_thread) from [<800463bc>] (kthread+0xd0/0xec) r10:00000000 r9:00000000 r8:00000000 r7:8003f5dc r6:9e135300 r5:9e134ac0 r4:00000000 [<800462ec>] (kthread) from [<8000eb68>] (ret_from_fork+0x14/0x2c) r7:00000000 r6:00000000 r5:800462ec r4:9e134ac0 Code: e1a0c00d e92dd800 e24cb004 e590322c (e5130030) ---[ end trace eeb2712470f0de35 ]--- Fixing recursive fault but reboot is needed! BUG: spinlock lockup suspected on CPU#0, kworker/0:1/21 lock: 0x9fbd3c40, .magic: dead4ead, .owner: kworker/0:1/21, .owner_cpu: 0 CPU: 0 PID: 21 Comm: kworker/0:1 Tainted: G D 3.15.0-rc3-00071-g49a96400a142-dirty #118 Backtrace: [<80011c50>] (dump_backtrace) from [<80011dec>] (show_stack+0x18/0x1c) r6:016e3600 r5:00000000 r4:00000000 r3:00000000 [<80011dd4>] (show_stack) from [<8065b720>] (dump_stack+0x88/0xa4) [<8065b698>] (dump_stack) from [<806595ac>] (spin_dump+0x7c/0x90) r5:9fbd3c40 r4:9e11c440 [<80659530>] (spin_dump) from [<80068a74>] (do_raw_spin_lock+0x110/0x198) r5:00000000 r4:016e3600 [<80068964>] (do_raw_spin_lock) from [<80661fac>] (_raw_spin_lock_irq+0x44/0x4c) r10:808f2d2c r9:8094e944 r8:808e8c40 r7:00000000 r6:9e14e000 r5:8065dab4 r4:9fbd3c40 r3:9e11c440 [<80661f68>] (_raw_spin_lock_irq) from [<8065dab4>] (__schedule+0x60/0x5cc) r5:9e11c440 r4:9fbd3c40 [<8065da54>] (__schedule) from [<8065e114>] (schedule+0x38/0x88) r10:00000001 r9:8094e944 r8:9e14e000 r7:808f760c r6:9e11c440 r5:0000000b r4:0000000b [<8065e0dc>] (schedule) from [<8002b2dc>] (do_exit+0x858/0x8d8) [<8002aa84>] (do_exit) from [<80011ff4>] (die+0x204/0x3c0) r7:808f760c [<80011df0>] (die) from [<80658498>] (__do_kernel_fault.part.9+0x5c/0x7c) r10:9e11c440 r9:9e11c698 r8:ffffffd0 r7:9e14fab8 r6:00000000 r5:00000017 r4:ffffffd0 [<8065843c>] (__do_kernel_fault.part.9) from [<8001bcd8>] (do_page_fault+0x1b8/0x3e4) r7:00000017 r3:9e14fab8 [<8001bb20>] (do_page_fault) from [<8000840c>] (do_DataAbort+0x3c/0xa0) r10:808f2d2c r9:9e11c698 r8:9e14fab8 r7:ffffffd0 r6:808f8314 r5:8001bb20 r4:00000017 [<800083d0>] (do_DataAbort) from [<800128a4>] (__dabt_svc+0x44/0x80) Exception stack(0x9e14fab8 to 0x9e14fb00) faa0: 9e11c440 00000000 fac0: 00000000 00000000 00000000 9e11c440 9e14e000 00000000 808e8c40 9e11c698 fae0: 808f2d2c 9e14fb0c 9e14fb10 9e14fb00 8004047c 8004673c 00000193 ffffffff r8:808e8c40 r7:9e14faec r6:ffffffff r5:00000193 r4:8004673c [<8004672c>] (kthread_data) from [<8004047c>] (wq_worker_sleeping+0x14/0xc8) [<80040468>] (wq_worker_sleeping) from [<8065dd8c>] (__schedule+0x338/0x5cc) r4:9fbd3c40 r3:00000020 [<8065da54>] (__schedule) from [<8065e114>] (schedule+0x38/0x88) r10:9e068000 r9:9e11c614 r8:9e14e000 r7:9e11c438 r6:9e11c440 r5:9e11c438 r4:00000001 [<8065e0dc>] (schedule) from [<8002b088>] (do_exit+0x604/0x8d8) [<8002aa84>] (do_exit) from [<80011ff4>] (die+0x204/0x3c0) r7:808f760c [<80011df0>] (die) from [<80658498>] (__do_kernel_fault.part.9+0x5c/0x7c) r10:9e11c440 r9:00000001 r8:00000010 r7:9e14fdf8 r6:00000000 r5:00000017 r4:00000010 [<8065843c>] (__do_kernel_fault.part.9) from [<8001bcd8>] (do_page_fault+0x1b8/0x3e4) r7:00000017 r3:9e14fdf8 [<8001bb20>] (do_page_fault) from [<8000840c>] (do_DataAbort+0x3c/0xa0) r10:9fbd6b00 r9:00000001 r8:9e14fdf8 r7:00000010 r6:808f8314 r5:8001bb20 r4:00000017 [<800083d0>] (do_DataAbort) from [<800128a4>] (__dabt_svc+0x44/0x80) Exception stack(0x9e14fdf8 to 0x9e14fe40) fde0: 9e369a00 00000000 fe00: 00000000 00000000 00000000 00000002 9e369a00 00000010 00000000 00000001 fe20: 9fbd6b00 9e14fe5c 80a26e60 9e14fe40 800661b8 804e8fb8 80000013 ffffffff r8:00000000 r7:9e14fe2c r6:ffffffff r5:80000013 r4:804e8fb8 [<804e8f3c>] (sgtl5000_resume) from [<804d90d0>] (soc_resume_deferred+0x10c/0x30c) r7:9e387da4 r6:9e387c64 r5:9e369a00 r4:9e387d84 [<804d8fc4>] (soc_resume_deferred) from [<8003f060>] (process_one_work+0x1a8/0x444) r10:9fbd6b00 r8:00000000 r7:9e14e000 r6:9fbd36c0 r5:9e387d84 r4:9e135300 [<8003eeb8>] (process_one_work) from [<8003f700>] (worker_thread+0x124/0x398) r10:8094e442 r9:9fbd36c0 r8:9e14e000 r7:9e135318 r6:9e14e000 r5:9fbd36f0 r4:9e135300 [<8003f5dc>] (worker_thread) from [<800463bc>] (kthread+0xd0/0xec) r10:00000000 r9:00000000 r8:00000000 r7:8003f5dc r6:9e135300 r5:9e134ac0 r4:00000000 [<800462ec>] (kthread) from [<8000eb68>] (ret_from_fork+0x14/0x2c) r7:00000000 r6:00000000 r5:800462ec r4:9e134ac0