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genirq: Avoid unnecessary low level irq function calls 

Check irq state in enable/disable/unmask/mask_irq to avoid unnecessary
low level irq function calls.

This has two advantages:
    - Conditionals are faster than hardware access

    - Solves issues with the underlying refcounting of the pinctrl
      infrastructure

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: tfiga@chromium.org
Cc: briannorris@chromium.org
Cc: dianders@chromium.org
Link: http://lkml.kernel.org/r/1498476814-12563-2-git-send-email-jeffy.chen@rock-chips.com
This commit is contained in:
Jeffy Chen 2017-06-26 19:33:34 +08:00 committed by Thomas Gleixner
parent d829b8fb24
commit bf22ff45be
1 changed files with 33 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
kernel/irq/chip.c
View File

@ -314,22 +314,32 @@ void irq_shutdown(struct irq_desc *desc)
void irq_enable(struct irq_desc *desc)
{
irq_state_clr_disabled(desc);
if (desc->irq_data.chip->irq_enable)
desc->irq_data.chip->irq_enable(&desc->irq_data);
else
desc->irq_data.chip->irq_unmask(&desc->irq_data);
irq_state_clr_masked(desc);
if (!irqd_irq_disabled(&desc->irq_data)) {
unmask_irq(desc);
} else {
irq_state_clr_disabled(desc);
if (desc->irq_data.chip->irq_enable) {
desc->irq_data.chip->irq_enable(&desc->irq_data);
irq_state_clr_masked(desc);
} else {
unmask_irq(desc);
}
}
}
static void __irq_disable(struct irq_desc *desc, bool mask)
{
irq_state_set_disabled(desc);
if (desc->irq_data.chip->irq_disable) {
desc->irq_data.chip->irq_disable(&desc->irq_data);
irq_state_set_masked(desc);
} else if (mask) {
mask_irq(desc);
if (irqd_irq_disabled(&desc->irq_data)) {
if (mask)
mask_irq(desc);
} else {
irq_state_set_disabled(desc);
if (desc->irq_data.chip->irq_disable) {
desc->irq_data.chip->irq_disable(&desc->irq_data);
irq_state_set_masked(desc);
} else if (mask) {
mask_irq(desc);
}
}
}
@ -378,18 +388,21 @@ void irq_percpu_disable(struct irq_desc *desc, unsigned int cpu)
static inline void mask_ack_irq(struct irq_desc *desc)
{
if (desc->irq_data.chip->irq_mask_ack)
if (desc->irq_data.chip->irq_mask_ack) {
desc->irq_data.chip->irq_mask_ack(&desc->irq_data);
else {
desc->irq_data.chip->irq_mask(&desc->irq_data);
irq_state_set_masked(desc);
} else {
mask_irq(desc);
if (desc->irq_data.chip->irq_ack)
desc->irq_data.chip->irq_ack(&desc->irq_data);
}
irq_state_set_masked(desc);
}
void mask_irq(struct irq_desc *desc)
{
if (irqd_irq_masked(&desc->irq_data))
return;
if (desc->irq_data.chip->irq_mask) {
desc->irq_data.chip->irq_mask(&desc->irq_data);
irq_state_set_masked(desc);
@ -398,6 +411,9 @@ void mask_irq(struct irq_desc *desc)
void unmask_irq(struct irq_desc *desc)
{
if (!irqd_irq_masked(&desc->irq_data))
return;
if (desc->irq_data.chip->irq_unmask) {
desc->irq_data.chip->irq_unmask(&desc->irq_data);
irq_state_clr_masked(desc);
@ -411,10 +427,7 @@ void unmask_threaded_irq(struct irq_desc *desc)
if (chip->flags & IRQCHIP_EOI_THREADED)
chip->irq_eoi(&desc->irq_data);
if (chip->irq_unmask) {
chip->irq_unmask(&desc->irq_data);
irq_state_clr_masked(desc);
}
unmask_irq(desc);
}
/*