This is a note to let you know that I've just added the patch titled
irqchip/atmel-aic: Fix potential deadlock in ->xlate()
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-atmel-aic-fix-potential-deadlock-in-xlate.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5eb0d6eb3fac3daa60d9190eed9fa41cf809c756 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Date: Tue, 13 Sep 2016 15:58:29 +0200
Subject: irqchip/atmel-aic: Fix potential deadlock in ->xlate()
From: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
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 <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Acked-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1473775109-4192-2-git-send-email-boris.brezillon@xxxxxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/irqchip/irq-atmel-aic.c | 5 +++--
drivers/irqchip/irq-atmel-aic5.c | 5 +++--
2 files changed, 6 insertions(+), 4 deletions(-)
--- 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 i
{
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 i
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;
}
--- 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
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
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;
}
Patches currently in stable-queue which might be from boris.brezillon@xxxxxxxxxxxxxxxxxx are
queue-4.4/irqchip-atmel-aic-fix-potential-deadlock-in-xlate.patch
queue-4.4/drm-atmel-hlcdc-fix-vertical-scaling.patch
queue-4.4/genirq-provide-irq_gc_-lock_irqsave-unlock_irqrestore-helpers.patch
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