linux-kernel - [PATCH 5.9 028/255] irqchip/sifive-plic: Fix chip

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Message-Id: <20201117122140.313789869@linuxfoundation.org>
Date:   Tue, 17 Nov 2020 14:02:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Greentime Hu <greentime.hu@...ive.com>,
        Marc Zyngier <maz@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atish.patra@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 028/255] irqchip/sifive-plic: Fix chip_data access within a hierarchy

From: Greentime Hu <greentime.hu@...ive.com>

[ Upstream commit f9ac7bbd6e4540dcc6df621b9c9b6eb2e26ded1d ]

The plic driver crashes in plic_irq_unmask() when the interrupt is within a
hierarchy, as it picks the top-level chip_data instead of its local one.

Using irq_data_get_irq_chip_data() instead of irq_get_chip_data() solves
the issue for good.

Fixes: f1ad1133b18f ("irqchip/sifive-plic: Add support for multiple PLICs")
Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
[maz: rewrote commit message]
Signed-off-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Anup Patel <anup@...infault.org>
Reviewed-by: Atish Patra <atish.patra@....com>
Link: https://lore.kernel.org/r/20201029023738.127472-1-greentime.hu@sifive.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/irqchip/irq-sifive-plic.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 4048657ece0ac..6f432d2a5cebd 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -99,7 +99,7 @@ static inline void plic_irq_toggle(const struct cpumask *mask,
 				   struct irq_data *d, int enable)
 {
 	int cpu;
-	struct plic_priv *priv = irq_get_chip_data(d->irq);
+	struct plic_priv *priv = irq_data_get_irq_chip_data(d);
 
 	writel(enable, priv->regs + PRIORITY_BASE + d->hwirq * PRIORITY_PER_ID);
 	for_each_cpu(cpu, mask) {
@@ -115,7 +115,7 @@ static void plic_irq_unmask(struct irq_data *d)
 {
 	struct cpumask amask;
 	unsigned int cpu;
-	struct plic_priv *priv = irq_get_chip_data(d->irq);
+	struct plic_priv *priv = irq_data_get_irq_chip_data(d);
 
 	cpumask_and(&amask, &priv->lmask, cpu_online_mask);
 	cpu = cpumask_any_and(irq_data_get_affinity_mask(d),
@@ -127,7 +127,7 @@ static void plic_irq_unmask(struct irq_data *d)
 
 static void plic_irq_mask(struct irq_data *d)
 {
-	struct plic_priv *priv = irq_get_chip_data(d->irq);
+	struct plic_priv *priv = irq_data_get_irq_chip_data(d);
 
 	plic_irq_toggle(&priv->lmask, d, 0);
 }
@@ -138,7 +138,7 @@ static int plic_set_affinity(struct irq_data *d,
 {
 	unsigned int cpu;
 	struct cpumask amask;
-	struct plic_priv *priv = irq_get_chip_data(d->irq);
+	struct plic_priv *priv = irq_data_get_irq_chip_data(d);
 
 	cpumask_and(&amask, &priv->lmask, mask_val);
 
-- 
2.27.0