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genirq: Implement irq_set_handler_locked()/irq_set_chip_handler_name_locked()

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The main use case for the exisiting __irq_set_*_locked() inlines is to
replace the handler [,chip and name] of an interrupt from a region
which has the irq descriptor lock held, e.g. from the irq_set_type()
callback. The first argument is the irq number, so the functions need
so perform a pointless lookup of the interrupt descriptor for those
cases which have the irq_data pointer handy.

Provide new functions which take an irq_data pointer instead of the
interrupt number, so the lookup of the interrupt descriptor can be
avoided.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiang Liu <jiang.liu@linux.intel.com>

Conflicts:
	include/linux/irqdesc.h
This commit is contained in:
Thomas Gleixner 2015-06-23 15:01:30 +02:00
parent 304adf8a8f
commit bbc9d21fc0
1 changed files with 41 additions and 0 deletions
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41
include/linux/irqdesc.h
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@ -190,6 +190,47 @@ __irq_set_chip_handler_name_locked(unsigned int irq, struct irq_chip *chip,
desc->name = name;
}
/**
* irq_set_handler_locked - Set irq handler from a locked region
* @data: Pointer to the irq_data structure which identifies the irq
* @handler: Flow control handler function for this interrupt
*
* Sets the handler in the irq descriptor associated to @data.
*
* Must be called with irq_desc locked and valid parameters. Typical
* call site is the irq_set_type() callback.
*/
static inline void irq_set_handler_locked(struct irq_data *data,
irq_flow_handler_t handler)
{
struct irq_desc *desc = irq_data_to_desc(data);
desc->handle_irq = handler;
}
/**
* irq_set_chip_handler_name_locked - Set chip, handler and name from a locked region
* @data: Pointer to the irq_data structure for which the chip is set
* @chip: Pointer to the new irq chip
* @handler: Flow control handler function for this interrupt
* @name: Name of the interrupt
*
* Replace the irq chip at the proper hierarchy level in @data and
* sets the handler and name in the associated irq descriptor.
*
* Must be called with irq_desc locked and valid parameters.
*/
static inline void
irq_set_chip_handler_name_locked(struct irq_data *data, struct irq_chip *chip,
irq_flow_handler_t handler, const char *name)
{
struct irq_desc *desc = irq_data_to_desc(data);
desc->handle_irq = handler;
desc->name = name;
data->chip = chip;
}
static inline int irq_balancing_disabled(unsigned int irq)
{
struct irq_desc *desc;