Re: [PATCH] powerpc/powermac: Add missing lockdep_register_key()

Le 30/11/2021 à 14:53, Erhard F. a écrit :

On Tue, 30 Nov 2021 10:32:42 +0100
Christophe Leroy [off-list ref] wrote:

quoted

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 <redacted>
Signed-off-by: Christophe Leroy <redacted>
---
  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).

Is that still exactly the same backtrace , ie still pointing to 
kw_i2c_add() ?

Because I see from original bug that in fact the offending commit added 
lockdep_set_class() at 3 places. So it is likely that 
lockdep_register_key() also needs to be added at the two other places.

So if the call trace now gives pmu_i2c_probe() or smu_i2c_probe() then 
you could try and add lockdep_register_key() also there and see if it 
fixes things.

Christophe