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irqchip/atmel-aic: Fix potential deadlock in ->xlate()

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aic5_irq_domain_xlate() and aic_irq_domain_xlate() take the generic chip
lock without disabling interrupts, which can lead to a deadlock if an
interrupt occurs while the lock is held in one of these functions.

Replace irq_gc_{lock,unlock}() calls by
irq_gc_{lock_irqsave,unlock_irqrestore}() ones to prevent this bug from
happening.

Fixes: b1479ebb77 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers")
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable@vger.kernel.org
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Link: http://lkml.kernel.org/r/1473775109-4192-2-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Boris Brezillon 2016-09-13 15:58:29 +02:00 committed by Thomas Gleixner
parent ebf9ff753c
commit 5eb0d6eb3f
2 changed files with 6 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;
}