From 687127db08cb3a02f5aaa3b107abe53d9db5aed4 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 11 Feb 2022 19:14:54 +0100 Subject: [PATCH 159/166] genirq: Provide generic_handle_irq_safe(). Provide generic_handle_irq_safe() which can used from any context. Suggested-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Hans de Goede Reviewed-by: Oleksandr Natalenko Reviewed-by: Wolfram Sang Link: https://lore.kernel.org/r/20220211181500.1856198-2-bigeasy@linutronix.de (cherry picked from commit ac9c70a245d28b67db09c1fb45696ab04b4f5b72) Signed-off-by: Clark Williams --- include/linux/irqdesc.h | 1 + kernel/irq/irqdesc.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+) Index: linux-5.15.32-rt39/include/linux/irqdesc.h =================================================================== --- linux-5.15.32-rt39.orig/include/linux/irqdesc.h +++ linux-5.15.32-rt39/include/linux/irqdesc.h @@ -160,6 +160,7 @@ static inline void generic_handle_irq_de int handle_irq_desc(struct irq_desc *desc); int generic_handle_irq(unsigned int irq); +int generic_handle_irq_safe(unsigned int irq); #ifdef CONFIG_IRQ_DOMAIN /* Index: linux-5.15.32-rt39/kernel/irq/irqdesc.c =================================================================== --- linux-5.15.32-rt39.orig/kernel/irq/irqdesc.c +++ linux-5.15.32-rt39/kernel/irq/irqdesc.c @@ -661,6 +661,29 @@ int generic_handle_irq(unsigned int irq) } EXPORT_SYMBOL_GPL(generic_handle_irq); +/** + * generic_handle_irq_safe - Invoke the handler for a particular irq from any + * context. + * @irq: The irq number to handle + * + * Returns: 0 on success, a negative value on error. + * + * This function can be called from any context (IRQ or process context). It + * will report an error if not invoked from IRQ context and the irq has been + * marked to enforce IRQ-context only. + */ +int generic_handle_irq_safe(unsigned int irq) +{ + unsigned long flags; + int ret; + + local_irq_save(flags); + ret = handle_irq_desc(irq_to_desc(irq)); + local_irq_restore(flags); + return ret; +} +EXPORT_SYMBOL_GPL(generic_handle_irq_safe); + #ifdef CONFIG_IRQ_DOMAIN /** * generic_handle_domain_irq - Invoke the handler for a HW irq belonging