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 raw_spin_{lock_irqsave,unlock_irqrestore}() ones to prevent this bug from happening. Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx> Fixes: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers") Cc: <stable@xxxxxxxxxxxxxxx> Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- Changes in v2: - add Marc's ack - fix stable ML address --- drivers/irqchip/irq-atmel-aic.c | 5 +++-- drivers/irqchip/irq-atmel-aic5.c | 5 +++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c index 112e17c2768b..447a8b0f1395 100644 --- a/drivers/irqchip/irq-atmel-aic.c +++ b/drivers/irqchip/irq-atmel-aic.c @@ -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); + raw_spin_lock_irqsave(&gc->lock, 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); + raw_spin_unlock_irqrestore(&gc->lock, flags); return ret; } diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c index 4f0d068e1abe..8c024107fd03 100644 --- a/drivers/irqchip/irq-atmel-aic5.c +++ b/drivers/irqchip/irq-atmel-aic5.c @@ -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); + raw_spin_lock_irqsave(&bgc->lock, 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); + raw_spin_unlock_irqrestore(&bgc->lock, flags); return ret; } -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html