linux-serial.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>,
	Jiri Slaby <jirislaby@kernel.org>,
	linux-renesas-soc@vger.kernel.org, linux-serial@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Prabhakar <prabhakar.csengg@gmail.com>,
	Biju Das <biju.das.jz@bp.renesas.com>
Subject: Re: [PATCH] serial: sh-sci: Initialize spinlock for uart console
Date: Wed, 1 Jul 2020 18:40:45 +0200	[thread overview]
Message-ID: <20200701164045.GA3163341@kroah.com> (raw)
In-Reply-To: <1593618100-2151-1-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com>

On Wed, Jul 01, 2020 at 04:41:40PM +0100, Lad Prabhakar wrote:
> serial core expects the spinlock to be initialized by the controller
> driver for serial console, this patch makes sure the spinlock is
> initialized, fixing the below issue:
> 
> [    0.865928] BUG: spinlock bad magic on CPU#0, swapper/0/1
> [    0.865945]  lock: sci_ports+0x0/0x4c80, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
> [    0.865955] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc1+ #112
> [    0.865961] Hardware name: HopeRun HiHope RZ/G2H with sub board (DT)
> [    0.865968] Call trace:
> [    0.865979]  dump_backtrace+0x0/0x1d8
> [    0.865985]  show_stack+0x14/0x20
> [    0.865996]  dump_stack+0xe8/0x130
> [    0.866006]  spin_dump+0x6c/0x88
> [    0.866012]  do_raw_spin_lock+0xb0/0xf8
> [    0.866023]  _raw_spin_lock_irqsave+0x80/0xa0
> [    0.866032]  uart_add_one_port+0x3a4/0x4e0
> [    0.866039]  sci_probe+0x504/0x7c8
> [    0.866048]  platform_drv_probe+0x50/0xa0
> [    0.866059]  really_probe+0xdc/0x330
> [    0.866066]  driver_probe_device+0x58/0xb8
> [    0.866072]  device_driver_attach+0x6c/0x90
> [    0.866078]  __driver_attach+0x88/0xd0
> [    0.866085]  bus_for_each_dev+0x74/0xc8
> [    0.866091]  driver_attach+0x20/0x28
> [    0.866098]  bus_add_driver+0x14c/0x1f8
> [    0.866104]  driver_register+0x60/0x110
> [    0.866109]  __platform_driver_register+0x40/0x48
> [    0.866119]  sci_init+0x2c/0x34
> [    0.866127]  do_one_initcall+0x88/0x428
> [    0.866137]  kernel_init_freeable+0x2c0/0x328
> [    0.866143]  kernel_init+0x10/0x108
> [    0.866150]  ret_from_fork+0x10/0x18
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>

This should be backported to older kernels too, right?  How far back?

thanks,

greg k-h

  reply	other threads:[~2020-07-01 16:41 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-01 15:41 [PATCH] serial: sh-sci: Initialize spinlock for uart console Lad Prabhakar
2020-07-01 16:40 ` Greg Kroah-Hartman [this message]
2020-07-01 17:17 ` Geert Uytterhoeven
     [not found]   ` <CA+V-a8v+2fhqwRNCaGYbmh8E1FDyc2Xss3PHk12dpTt_pgmCFg@mail.gmail.com>
2020-07-02  9:23     ` Geert Uytterhoeven
2020-07-02 10:49       ` Lad, Prabhakar
     [not found]         ` <CA+V-a8vq4rJAoA583O_28NK2cCEFAzDszDQTPRQHWiXCtDxd-w@mail.gmail.com>
2020-07-02 12:52           ` Geert Uytterhoeven
2020-07-02 14:05             ` Lad, Prabhakar
2020-07-02 14:39               ` Geert Uytterhoeven
2020-07-02 18:32                 ` Lad, Prabhakar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200701164045.GA3163341@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=biju.das.jz@bp.renesas.com \
    --cc=geert+renesas@glider.be \
    --cc=jirislaby@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-renesas-soc@vger.kernel.org \
    --cc=linux-serial@vger.kernel.org \
    --cc=prabhakar.csengg@gmail.com \
    --cc=prabhakar.mahadev-lad.rj@bp.renesas.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).