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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2022-05-09 16:04:08 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-09-19 15:08:38 +0200 |
| commit | 6a164c646999847b843e651f71c53dfaceb2c2b4 (patch) | |
| tree | f44a07a4b96c5b95cee110a90f1c87e3d166194f /kernel/irq/irqdesc.c | |
| parent | 521a547ced6477c54b4b0cc206000406c221b4d6 (diff) | |
| download | linux-6a164c646999847b843e651f71c53dfaceb2c2b4.tar.gz linux-6a164c646999847b843e651f71c53dfaceb2c2b4.tar.bz2 linux-6a164c646999847b843e651f71c53dfaceb2c2b4.zip | |
genirq: Provide generic_handle_domain_irq_safe().
commit 509853f9e1e7b ("genirq: Provide generic_handle_irq_safe()")
addressed the problem of demultiplexing interrupt handlers which are force
threaded on PREEMPT_RT enabled kernels which means that the demultiplexed
handler is invoked with interrupts enabled which triggers a lockdep
warning due to a non-irq safe lock acquisition.
The same problem exists for the irq domain based interrupt handling via
generic_handle_domain_irq() which has been reported against the AMD
pin-ctrl driver.
Provide generic_handle_domain_irq_safe() which can used from any context.
[ tglx: Split the usage sites out and massaged changelog ]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/YnkfWFzvusFFktSt@linutronix.de
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215954
Diffstat (limited to 'kernel/irq/irqdesc.c')
| -rw-r--r-- | kernel/irq/irqdesc.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 5db0230aa6b5..a91f9001103c 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -705,6 +705,30 @@ int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq) } EXPORT_SYMBOL_GPL(generic_handle_domain_irq); + /** + * generic_handle_irq_safe - Invoke the handler for a HW irq belonging + * to a domain from any context. + * @domain: The domain where to perform the lookup + * @hwirq: The HW irq number to convert to a logical one + * + * Returns: 0 on success, a negative value on error. + * + * This function can be called from any context (IRQ or process + * context). If the interrupt is marked as 'enforce IRQ-context only' then + * the function must be invoked from hard interrupt context. + */ +int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq) +{ + unsigned long flags; + int ret; + + local_irq_save(flags); + ret = handle_irq_desc(irq_resolve_mapping(domain, hwirq)); + local_irq_restore(flags); + return ret; +} +EXPORT_SYMBOL_GPL(generic_handle_domain_irq_safe); + /** * generic_handle_domain_nmi - Invoke the handler for a HW nmi belonging * to a domain. |