Re: [PATCH v2] Revert "ALSA: hda: Add support for Loongson 7A1000 controller"

[Tiezhu Yang]

On 09/08/2020 08:37 AM, Huacai Chen wrote:
> Hi, all
>
> This patch should be backported to 5.4.

Hi,

Commit 61eee4a7fc40 ("ALSA: hda: Add support for Loongson
7A1000 controller") has been not yet merged into 5.4, so no
need to backport.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/sound/pci/hda/hda_intel.c?h=v5.4

Thanks,
Tiezhu

> Huacai
>
> On Tue, Aug 25, 2020 at 6:03 PM Takashi Iwai <tiwai@xxxxxxx> wrote:
> > On Tue, 25 Aug 2020 11:39:48 +0200,
> > Tiezhu Yang wrote:
> > > This reverts commit 61eee4a7fc40 ("ALSA: hda: Add support for Loongson
> > > 7A1000 controller") to fix the following error on the Loongson LS7A
> > > platform:
> > >
> > > rcu: INFO: rcu_preempt self-detected stall on CPU
> > > <SNIP>
> > > NMI backtrace for cpu 0
> > > CPU: 0 PID: 68 Comm: kworker/0:2 Not tainted 5.8.0+ #3
> > > Hardware name:  , BIOS
> > > Workqueue: events azx_probe_work [snd_hda_intel]
> > > <SNIP>
> > > Call Trace:
> > > [<ffffffff80211a64>] show_stack+0x9c/0x130
> > > [<ffffffff8065a740>] dump_stack+0xb0/0xf0
> > > [<ffffffff80665774>] nmi_cpu_backtrace+0x134/0x140
> > > [<ffffffff80665910>] nmi_trigger_cpumask_backtrace+0x190/0x200
> > > [<ffffffff802b1abc>] rcu_dump_cpu_stacks+0x12c/0x190
> > > [<ffffffff802b08cc>] rcu_sched_clock_irq+0xa2c/0xfc8
> > > [<ffffffff802b91d4>] update_process_times+0x2c/0xb8
> > > [<ffffffff802cad80>] tick_sched_timer+0x40/0xb8
> > > [<ffffffff802ba5f0>] __hrtimer_run_queues+0x118/0x1d0
> > > [<ffffffff802bab74>] hrtimer_interrupt+0x12c/0x2d8
> > > [<ffffffff8021547c>] c0_compare_interrupt+0x74/0xa0
> > > [<ffffffff80296bd0>] __handle_irq_event_percpu+0xa8/0x198
> > > [<ffffffff80296cf0>] handle_irq_event_percpu+0x30/0x90
> > > [<ffffffff8029d958>] handle_percpu_irq+0x88/0xb8
> > > [<ffffffff80296124>] generic_handle_irq+0x44/0x60
> > > [<ffffffff80b3cfd0>] do_IRQ+0x18/0x28
> > > [<ffffffff8067ace4>] plat_irq_dispatch+0x64/0x100
> > > [<ffffffff80209a20>] handle_int+0x140/0x14c
> > > [<ffffffff802402e8>] irq_exit+0xf8/0x100
> > >
> > > Because AZX_DRIVER_GENERIC can not work well for Loongson LS7A HDA
> > > controller, it needs some workarounds which are not merged into the
> > > upstream kernel at this time, so it should revert this patch now.
> > >
> > > Fixes: 61eee4a7fc40 ("ALSA: hda: Add support for Loongson 7A1000 controller")
> > > Cc: <stable@xxxxxxxxxxxxxxx> # 5.9-rc1+
> > > Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
> > > ---
> > >
> > > v2: update commit message
> > Applied now.  Thanks.
> >
> >
> > Takashi