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    Subject[PATCH 5/7] genirq: Add devm_request_any_context_irq()
    Date
    Some drivers use request_any_context_irq() but there isn't a
    devm_* function for it. Add one so that these drivers don't need
    to explicitly free the irq on driver detach.

    Cc: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
    ---
    include/linux/interrupt.h | 5 +++++
    kernel/irq/devres.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 50 insertions(+)

    diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
    index c9e831d..8334f9b 100644
    --- a/include/linux/interrupt.h
    +++ b/include/linux/interrupt.h
    @@ -160,6 +160,11 @@ devm_request_irq(struct device *dev, unsigned int irq, irq_handler_t handler,
    devname, dev_id);
    }

    +extern int __must_check
    +devm_request_any_context_irq(struct device *dev, unsigned int irq,
    + irq_handler_t handler, unsigned long irqflags,
    + const char *devname, void *dev_id);
    +
    extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);

    /*
    diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
    index bd8e788..f71e9ff 100644
    --- a/kernel/irq/devres.c
    +++ b/kernel/irq/devres.c
    @@ -73,6 +73,51 @@ int devm_request_threaded_irq(struct device *dev, unsigned int irq,
    EXPORT_SYMBOL(devm_request_threaded_irq);

    /**
    + * devm_request_any_context_irq - allocate an interrupt line for a managed device
    + * @dev: device to request interrupt for
    + * @irq: Interrupt line to allocate
    + * @handler: Function to be called when the IRQ occurs
    + * @thread_fn: function to be called in a threaded interrupt context. NULL
    + * for devices which handle everything in @handler
    + * @irqflags: Interrupt type flags
    + * @devname: An ascii name for the claiming device
    + * @dev_id: A cookie passed back to the handler function
    + *
    + * Except for the extra @dev argument, this function takes the
    + * same arguments and performs the same function as
    + * request_any_context_irq(). IRQs requested with this function will be
    + * automatically freed on driver detach.
    + *
    + * If an IRQ allocated with this function needs to be freed
    + * separately, devm_free_irq() must be used.
    + */
    +int devm_request_any_context_irq(struct device *dev, unsigned int irq,
    + irq_handler_t handler, unsigned long irqflags,
    + const char *devname, void *dev_id)
    +{
    + struct irq_devres *dr;
    + int rc;
    +
    + dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
    + GFP_KERNEL);
    + if (!dr)
    + return -ENOMEM;
    +
    + rc = request_any_context_irq(irq, handler, irqflags, devname, dev_id);
    + if (rc) {
    + devres_free(dr);
    + return rc;
    + }
    +
    + dr->irq = irq;
    + dr->dev_id = dev_id;
    + devres_add(dev, dr);
    +
    + return 0;
    +}
    +EXPORT_SYMBOL(devm_request_any_context_irq);
    +
    +/**
    * devm_free_irq - free an interrupt
    * @dev: device to free interrupt for
    * @irq: Interrupt line to free
    --
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
    hosted by The Linux Foundation


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