linux-kernel - Re: [PATCH v2 02/10] genirq: Add devm_request_any_context

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Message-ID: <52CB2D29.3050107@codeaurora.org>
Date:	Mon, 06 Jan 2014 14:24:41 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v2 02/10] genirq: Add devm_request_any_context_irq()

On 01/02/14 16:37, Stephen Boyd wrote:
> 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@...utronix.de>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>

Thomas, can you please review this patch?

> ---
>  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 0053adde0ed9..a2678d35b5a2 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -158,6 +158,11 @@ 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 bd8e788d71e0..1ef0606797c9 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

-- 
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