@@ -103,9 +103,11 @@ static void __plic_toggle(void __iomem *enable_base, int hwirq, int enable)
static void plic_toggle(struct plic_handler *handler, int hwirq, int enable)
{
- raw_spin_lock(&handler->enable_lock);
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&handler->enable_lock, flags);
__plic_toggle(handler->enable_base, hwirq, enable);
- raw_spin_unlock(&handler->enable_lock);
+ raw_spin_unlock_irqrestore(&handler->enable_lock, flags);
}
static inline void plic_irq_toggle(const struct cpumask *mask,
@@ -236,6 +238,7 @@ static int plic_irq_set_type(struct irq_data *d, unsigned int type)
static int plic_irq_suspend(void)
{
unsigned int i, cpu;
+ unsigned long flags;
u32 __iomem *reg;
struct plic_priv *priv;
@@ -253,12 +256,12 @@ static int plic_irq_suspend(void)
if (!handler->present)
continue;
- raw_spin_lock(&handler->enable_lock);
+ raw_spin_lock_irqsave(&handler->enable_lock, flags);
for (i = 0; i < DIV_ROUND_UP(priv->nr_irqs, 32); i++) {
reg = handler->enable_base + i * sizeof(u32);
handler->enable_save[i] = readl(reg);
}
- raw_spin_unlock(&handler->enable_lock);
+ raw_spin_unlock_irqrestore(&handler->enable_lock, flags);
}
return 0;
@@ -267,6 +270,7 @@ static int plic_irq_suspend(void)
static void plic_irq_resume(void)
{
unsigned int i, index, cpu;
+ unsigned long flags;
u32 __iomem *reg;
struct plic_priv *priv;
@@ -284,12 +288,12 @@ static void plic_irq_resume(void)
if (!handler->present)
continue;
- raw_spin_lock(&handler->enable_lock);
+ raw_spin_lock_irqsave(&handler->enable_lock, flags);
for (i = 0; i < DIV_ROUND_UP(priv->nr_irqs, 32); i++) {
reg = handler->enable_base + i * sizeof(u32);
writel(handler->enable_save[i], reg);
}
- raw_spin_unlock(&handler->enable_lock);
+ raw_spin_unlock_irqrestore(&handler->enable_lock, flags);
}
}
Now that PLIC driver is probed as a regular platform driver, the lock dependency validator complains about the safety of handler->enable_lock usage: [ 0.956775] Possible interrupt unsafe locking scenario: [ 0.956998] CPU0 CPU1 [ 0.957247] ---- ---- [ 0.957439] lock(&handler->enable_lock); [ 0.957607] local_irq_disable(); [ 0.957793] lock(&irq_desc_lock_class); [ 0.958021] lock(&handler->enable_lock); [ 0.958246] <Interrupt> [ 0.958342] lock(&irq_desc_lock_class); [ 0.958501] *** DEADLOCK *** To address above, use raw_spin_lock_irqsave/unlock_irqrestore() instead of raw_spin_lock/unlock(). Signed-off-by: Anup Patel <apatel@ventanamicro.com> --- drivers/irqchip/irq-sifive-plic.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-)