From: "Erhard F." <erhard_f@mailbox•org>
To: Christophe Leroy <christophe.leroy@csgroup•eu>
Cc: linuxppc-dev@lists•ozlabs.org, Paul Mackerras <paulus@samba•org>,
linux-kernel@vger•kernel.org
Subject: Re: [PATCH] powerpc/powermac: Add missing lockdep_register_key()
Date: Tue, 30 Nov 2021 14:53:18 +0100 [thread overview]
Message-ID: <20211130145318.5fcdf633@yea> (raw)
In-Reply-To: <69e4f55565bb45ebb0843977801b245af0c666fe.1638264741.git.christophe.leroy@csgroup.eu>
On Tue, 30 Nov 2021 10:32:42 +0100
Christophe Leroy <christophe.leroy@csgroup•eu> wrote:
> KeyWest i2c @0xf8001003 irq 42 /uni-n@f8000000/i2c@f8001000
> BUG: key c2d00cbc has not been registered!
> ------------[ cut here ]------------
> DEBUG_LOCKS_WARN_ON(1)
> WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:4801 lockdep_init_map_type+0x4c0/0xb4c
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.15.5-gentoo-PowerMacG4 #9
> NIP: c01a9428 LR: c01a9428 CTR: 00000000
> REGS: e1033cf0 TRAP: 0700 Not tainted (5.15.5-gentoo-PowerMacG4)
> MSR: 00029032 <EE,ME,IR,DR,RI> CR: 24002002 XER: 00000000
>
> GPR00: c01a9428 e1033db0 c2d1cf20 00000016 00000004 00000001 c01c0630 e1033a73
> GPR08: 00000000 00000000 00000000 e1033db0 24002004 00000000 f8729377 00000003
> GPR16: c1829a9c 00000000 18305357 c1416fc0 c1416f80 c006ac60 c2d00ca8 c1416f00
> GPR24: 00000000 c21586f0 c2160000 00000000 c2d00cbc c2170000 c216e1a0 c2160000
> NIP [c01a9428] lockdep_init_map_type+0x4c0/0xb4c
> LR [c01a9428] lockdep_init_map_type+0x4c0/0xb4c
> Call Trace:
> [e1033db0] [c01a9428] lockdep_init_map_type+0x4c0/0xb4c (unreliable)
> [e1033df0] [c1c177b8] kw_i2c_add+0x334/0x424
> [e1033e20] [c1c18294] pmac_i2c_init+0x9ec/0xa9c
> [e1033e80] [c1c1a790] smp_core99_probe+0xbc/0x35c
> [e1033eb0] [c1c03cb0] kernel_init_freeable+0x190/0x5a4
> [e1033f10] [c000946c] kernel_init+0x28/0x154
> [e1033f30] [c0035148] ret_from_kernel_thread+0x14/0x1c
>
> Add missing lockdep_register_key()
>
> Reported-by: Erhard Furtner <erhard_f@mailbox•org>
> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup•eu>
> ---
> arch/powerpc/platforms/powermac/low_i2c.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/platforms/powermac/low_i2c.c b/arch/powerpc/platforms/powermac/low_i2c.c
> index f77a59b5c2e1..de34fa34c42d 100644
> --- a/arch/powerpc/platforms/powermac/low_i2c.c
> +++ b/arch/powerpc/platforms/powermac/low_i2c.c
> @@ -582,6 +582,7 @@ static void __init kw_i2c_add(struct pmac_i2c_host_kw *host,
> bus->close = kw_i2c_close;
> bus->xfer = kw_i2c_xfer;
> mutex_init(&bus->mutex);
> + lockdep_register_key(&bus->lock_key);
> lockdep_set_class(&bus->mutex, &bus->lock_key);
> if (controller == busnode)
> bus->flags = pmac_i2c_multibus;
> --
> 2.33.1
>
The patch applied on 5.15.5 but unfortunately was not enough to fix the lockdep bug.
Originally was bug #200055 (https://bugzilla.kernel.org/show_bug.cgi?id=200055).
Regards,
Erhard
next prev parent reply other threads:[~2021-11-30 13:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-30 9:32 [PATCH] powerpc/powermac: Add missing lockdep_register_key() Christophe Leroy
2021-11-30 13:53 ` Erhard F. [this message]
2021-11-30 14:06 ` Christophe Leroy
2021-12-07 13:27 ` Michael Ellerman
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