Re: [PATCH net-next] dibs: Avoid inconsistent lockstate warning in dibs_lo_move_data()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Paolo Abeni <pabeni@xxxxxxxxxx>:

On Fri,  4 Sep 2026 11:44:46 +0200 you wrote:
> dibs->lock is acquired in process context and interrupt context
> (ism_handle_irq()). So always use spin_lock_irqsave() in process context.
> 
> Note that this is not a real deadlock, as dibs_lo devices don't have
> any interrupt context.
> 
> Example warning:
> [  153.760872] ================================
> [  153.760878] WARNING: inconsistent lock state
> [  153.760885] 7.2.0-15871-g544d85de4dc2 #16 Not tainted
> [  153.760891] --------------------------------
> [  153.760896] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
> [  153.760901] python3/5134 [HC0[0]:SC0[2]:HE1:SE0] takes:
> [  153.760909] 0001222c0fe72428 (&dibs->lock){?...}-{2:2}, at: dibs_lo_move_data+0x1ce/0x380
> [  153.760932] {IN-HARDIRQ-W} state was registered at:
> [  153.760937]   __lock_acquire+0x59c/0x15d0
> [  153.760947]   lock_acquire.part.0+0x11c/0x290
> [  153.760953]   lock_acquire+0xb4/0x1e0
> [  153.760959]   _raw_spin_lock+0x58/0xb0
> [  153.760966]   ism_handle_irq+0x80/0x3f0 [ism]
> [  153.760974]   __handle_irq_event_percpu+0x282/0x920
> [  153.760983]   handle_irq_event_percpu+0x26/0xe0
> [  153.760989]   handle_percpu_irq+0x10e/0x1a0
> [  153.760997]   handle_irq_desc+0xa6/0x100
> [  153.761003]   zpci_floating_irq_handler+0x3ca/0x610
> [  153.761011]   do_airq_interrupt+0x206/0x500
> [  153.761018]   __handle_irq_event_percpu+0x282/0x920
> [  153.761025]   handle_irq_event_percpu+0x26/0xe0
> [  153.761031]   handle_percpu_irq+0x10e/0x1a0
> [  153.761039]   handle_irq_desc+0xa6/0x100
> [  153.761045]   do_irq_async+0xec/0x150
> [  153.761052]   do_io_irq+0x150/0x2e0
> [  153.761060]   io_int_handler+0xec/0x118
> [  153.761066]   arch_cpu_idle+0x120/0x130
> [  153.761118]   arch_cpu_idle+0xbe/0x130
> [  153.761124]   s390_enter_idle+0x20/0x30
> [  153.761131]   cpuidle_enter_state+0xb6/0x440
> [  153.761138]   cpuidle_enter+0x64/0xb0
> [  153.761144]   cpuidle_idle_call+0x174/0x380
> [  153.761151]   do_idle+0x16e/0x250
> [  153.761157]   cpu_startup_entry+0x70/0x80
> [  153.761163]   smp_start_secondary+0x36e/0x440
> [  153.761171]   restart_int_handler+0x72/0x88
> [  153.761178] irq event stamp: 46536
> [  153.761182] hardirqs last  enabled at (46536): [<000127b697450a90>] __local_bh_enable_ip+0x140/0x270
> [  153.761193] hardirqs last disabled at (46535): [<000127b697450b20>] __local_bh_enable_ip+0x1d0/0x270
> [  153.761202] softirqs last  enabled at (46532): [<000127b6185f82c8>] smc_close_active+0x438/0xba0 [smc]
> [  153.761232] softirqs last disabled at (46534): [<000127b6185ee998>] smc_cdc_get_slot_and_msg_send+0x218/0x370 [smc]
> [  153.761257]
>                other info that might help us debug this:
> [  153.761262]  Possible unsafe locking scenario:
> 
> [...]

Here is the summary with links:
  - [net-next] dibs: Avoid inconsistent lockstate warning in dibs_lo_move_data()
    https://git.kernel.org/netdev/net-next/c/73db35350c5e

You are awesome, thank you!
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