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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull irq fixes from Thomas Gleixner:
 "Two patches from Boris which address a potential deadlock in the atmel
  irq chip driver"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/atmel-aic: Fix potential deadlock in ->xlate()
  genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers
This commit is contained in:
Linus Torvalds 2016-09-18 11:08:00 -07:00
commit aaed4d0bdd
3 changed files with 16 additions and 4 deletions
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5
drivers/irqchip/irq-atmel-aic.c
View File

@ -176,6 +176,7 @@ static int aic_irq_domain_xlate(struct irq_domain *d,
{
struct irq_domain_chip_generic *dgc = d->gc;
struct irq_chip_generic *gc;
unsigned long flags;
unsigned smr;
int idx;
int ret;
@ -194,11 +195,11 @@ static int aic_irq_domain_xlate(struct irq_domain *d,
gc = dgc->gc[idx];
irq_gc_lock(gc);
irq_gc_lock_irqsave(gc, flags);
smr = irq_reg_readl(gc, AT91_AIC_SMR(*out_hwirq));
aic_common_set_priority(intspec[2], &smr);
irq_reg_writel(gc, smr, AT91_AIC_SMR(*out_hwirq));
irq_gc_unlock(gc);
irq_gc_unlock_irqrestore(gc, flags);
return ret;
}

5
drivers/irqchip/irq-atmel-aic5.c
View File

@ -258,6 +258,7 @@ static int aic5_irq_domain_xlate(struct irq_domain *d,
unsigned int *out_type)
{
struct irq_chip_generic *bgc = irq_get_domain_generic_chip(d, 0);
unsigned long flags;
unsigned smr;
int ret;
@ -269,12 +270,12 @@ static int aic5_irq_domain_xlate(struct irq_domain *d,
if (ret)
return ret;
irq_gc_lock(bgc);
irq_gc_lock_irqsave(bgc, flags);
irq_reg_writel(bgc, *out_hwirq, AT91_AIC5_SSR);
smr = irq_reg_readl(bgc, AT91_AIC5_SMR);
aic_common_set_priority(intspec[2], &smr);
irq_reg_writel(bgc, smr, AT91_AIC5_SMR);
irq_gc_unlock(bgc);
irq_gc_unlock_irqrestore(bgc, flags);
return ret;
}

10
include/linux/irq.h
View File

@ -945,6 +945,16 @@ static inline void irq_gc_lock(struct irq_chip_generic *gc) { }
static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
#endif
/*
* The irqsave variants are for usage in non interrupt code. Do not use
* them in irq_chip callbacks. Use irq_gc_lock() instead.
*/
#define irq_gc_lock_irqsave(gc, flags) \
raw_spin_lock_irqsave(&(gc)->lock, flags)
#define irq_gc_unlock_irqrestore(gc, flags) \
raw_spin_unlock_irqrestore(&(gc)->lock, flags)
static inline void irq_reg_writel(struct irq_chip_generic *gc,
u32 val, int reg_offset)
{