From 805f0c26099d7c354654e1fe64a45b4c98a6cae7 Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Tue, 13 Sep 2016 15:58:29 +0200 Subject: [PATCH] irqchip/atmel-aic: Fix potential deadlock in ->xlate() commit 5eb0d6eb3fac3daa60d9190eed9fa41cf809c756 upstream. 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: b1479ebb7720 ("irqchip: atmel-aic: Add atmel AIC/AIC5 drivers") Signed-off-by: Boris Brezillon Acked-by: Marc Zyngier Cc: Jason Cooper Cc: Nicolas Ferre Cc: Alexandre Belloni Link: http://lkml.kernel.org/r/1473775109-4192-2-git-send-email-boris.brezillon@free-electrons.com Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- 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 8a0c7f288198..981c3959da59 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; @@ -194,12 +195,12 @@ 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)); ret = aic_common_set_priority(intspec[2], &smr); if (!ret) irq_reg_writel(gc, smr, AT91_AIC_SMR(*out_hwirq)); - irq_gc_unlock(gc); + irq_gc_unlock_irqrestore(gc, flags); return ret; } diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c index 62bb840c613f..7dee71bde350 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; @@ -269,13 +270,13 @@ 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); ret = aic_common_set_priority(intspec[2], &smr); if (!ret) irq_reg_writel(bgc, intspec[2] | smr, AT91_AIC5_SMR); - irq_gc_unlock(bgc); + irq_gc_unlock_irqrestore(bgc, flags); return ret; } -- 2.20.1