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Drivers: hv: vmbus: Replace lockdep_hardirq_threaded() with lockdep annotation

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lockdep_hardirq_threaded() is supposed to be used within IRQ core code
and not within drivers. It is not obvious from within the driver, that
this is the only interrupt service routing and that it is not shared
handler.

Replace lockdep_hardirq_threaded() with a lockdep annotation limiting
threaded context on PREEMPT_RT to __vmbus_isr().

Fixes: f8e6343b7a ("Drivers: hv: vmbus: Use kthread for vmbus interrupts on PREEMPT_RT")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior 2026-07-21 17:32:15 +02:00 committed by Wei Liu
parent ec08dd5b9f
commit 8c7ab779c8
1 changed files with 12 additions and 1 deletions
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13
drivers/hv/vmbus_drv.c
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@ -1384,8 +1384,19 @@ void vmbus_isr(void)
if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
vmbus_irqd_wake();
} else {
lockdep_hardirq_threaded();
static DEFINE_WAIT_OVERRIDE_MAP(vmbus_map, LD_WAIT_CONFIG);
/*
* vmbus_isr is never force-threaded and always invoked at hard
* IRQ level. __vmbus_isr() below can acquire a spinlock_t
* which becomes a sleeping lock and must not be acquired in
* this context. Therefore on PREEMPT_RT this will be threaded
* via vmbus_irqd_wake(). On non-PREEMPT the annotation lets
* lockdep know that acquiring a spinlock_t is not an issue.
*/
lock_map_acquire_try(&vmbus_map);
__vmbus_isr();
lock_map_release(&vmbus_map);
}
}
EXPORT_SYMBOL_FOR_MODULES(vmbus_isr, "mshv_vtl");