[alsa-devel] [PATCH 1/3] Revert "ASoC: Intel: Skylake: Acquire irq after RIRB allocation"

[Takashi Iwai]

On Mon, 10 Sep 2018 23:17:18 +0200,
Yu Zhao wrote:
> 
> This reverts commit 12eeeb4f4733bbc4481d01df35933fc15beb8b19.
> 
> The patch doesn't fix accessing memory with null pointer in
> skl_interrupt().
> 
> There are two problems: 1) skl_init_chip() is called twice, before
> and after dma buffer is allocate. The first call sets bus->chip_init
> which prevents the second from initializing bus->corb.buf and
> rirb.buf from bus->rb.area. 2) snd_hdac_bus_init_chip() enables
> interrupt before snd_hdac_bus_init_cmd_io() initializing dma buffers.
> There is a small window which skl_interrupt() can be called if irq
> has been acquired. If so, it crashes when using null dma buffer
> pointers.
> 
> Will fix the problems in the following patches. Also attaching the
> crash for future reference.
> 
> [   16.949148] general protection fault: 0000 [#1] PREEMPT SMP KASAN PTI
> [   16.950829] gsmi: Log Shutdown Reason 0x03
> [   16.950830] Modules linked in: uvcvideo(+) videobuf2_vmalloc snd_soc_skl(+) videobuf2_memops videobuf2_v4l2 videobuf2_core snd_soc_skl_ipc snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_acpi snd_hda_ext_core snd_hda_core snd_soc_max98357a acpi_als snd_soc_da7219 lzo lzo_compress zram snd_seq_dummy snd_seq snd_seq_device bridge stp llc ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_mark fuse cfg80211 iio_trig_sysfs cros_ec_sensors cros_ec_sensors_ring cros_ec_sensors_core industrialio_triggered_buffer kfifo_buf industrialio smsc95xx usbnet mii joydev
> [   16.950874] CPU: 0 PID: 1083 Comm: chrome Not tainted 4.14.64 #14
> [   16.950875] Hardware name: Google Yorp/Yorp, BIOS Google_Yorp.10985.0.2018_08_20_1648 08/17/2018
> [   16.950878] task: ffff88015b1c2b80 task.stack: ffff880155f30000
> [   16.950887] RIP: 0010:snd_hdac_bus_update_rirb+0x19b/0x4cf [snd_hda_core]
> [   16.950889] RSP: 0000:ffff88015c807c08 EFLAGS: 00010003
> [   16.950891] RAX: 0000000000000101 RBX: 000000000000080c RCX: 1ffff10026822185
> [   16.950893] RDX: dffffc0000000000 RSI: ffff88015b1c2b80 RDI: ffffc90000514058
> [   16.950894] RBP: ffff88015c807c68 R08: 0000000000000000 R09: 0000000000000000
> [   16.950895] R10: 0000000000000000 R11: ffffffffc043074f R12: 0000000000000800
> [   16.950897] R13: 0000000000000001 R14: 0000000000000002 R15: 1ffff10026822119
> [   16.950899] FS:  00007d85924cc740(0000) GS:ffff88015c800000(0000) knlGS:0000000000000000
> [   16.950900] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   16.950902] CR2: 000058a54df16038 CR3: 00000001551c0000 CR4: 00000000003406f0
> [   16.950903] Call Trace:
> [   16.950906]  <IRQ>
> [   16.950918]  skl_interrupt+0x19e/0x2d6 [snd_soc_skl]
> [   16.950926]  ? dma_supported+0xb5/0xb5 [snd_soc_skl]
> [   16.950933]  __handle_irq_event_percpu+0x27a/0x6c8
> [   16.950937]  ? __irq_wake_thread+0x1d1/0x1d1
> [   16.950942]  ? __do_softirq+0x57a/0x69e
> [   16.950944]  handle_irq_event_percpu+0x95/0x1ba
> [   16.950948]  ? _raw_spin_unlock+0x65/0xdc
> [   16.950951]  ? __handle_irq_event_percpu+0x6c8/0x6c8
> [   16.950953]  ? _raw_spin_unlock+0x65/0xdc
> [   16.950957]  ? time_cpufreq_notifier+0x483/0x483
> [   16.950959]  handle_irq_event+0x89/0x123
> [   16.950962]  handle_fasteoi_irq+0x16f/0x425
> [   16.950965]  handle_irq+0x1fe/0x28e
> [   16.950969]  do_IRQ+0x6e/0x12e
> [   16.950972]  common_interrupt+0x7a/0x7a
> [   16.950974]  </IRQ>
> [   16.950976] RIP: 0033:0x58097f61a5c0
> [   16.950978] RSP: 002b:00007ffe95c971a8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffffbc
> [   16.950980] RAX: 000058097f61a5c0 RBX: 00000e4ac5220560 RCX: 0000000000004e10
> [   16.950982] RDX: 000058098563df20 RSI: 00007ffe95c97250 RDI: 00000e4ac5220500
> [   16.950983] RBP: 00007ffe95c97410 R08: 0000000000000000 R09: 00007ffe95c97250
> [   16.950984] R10: 0000000000000000 R11: 0000000000000000 R12: 00000e4ac5220560
> [   16.950986] R13: 00000e4ac5220560 R14: 00000e4ac47c9650 R15: 0000580987646350
> [   16.950988] Code: 74 12 48 89 df e8 eb 2d 8e cd 48 ba 00 00 00 00 00 fc ff df 4c 8b 23 44 89 f0 83 c8 01 0f b7 c0 49 8d 1c 84 48 89 d8 48 c1 e8 03 <8a> 04 10 84 c0 0f 85 da 01 00 00 44 8b 3b 41 0f b7 c6 49 8d 1c
> [   16.951031] RIP: snd_hdac_bus_update_rirb+0x19b/0x4cf [snd_hda_core] RSP: ffff88015c807c08
> [   16.951036] ---[ end trace 58bf9ece1775bc92 ]---
> [   16.956871] Kernel panic - not syncing: Fatal exception in interrupt
> [   16.956888] Kernel Offset: 0xc800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Please try to rip off uninteresting hex values and other stuff there.

> Signed-off-by: Yu Zhao <yuzhao at google.com>

Put Fixes tag.


thanks,

Takashi