linux-kernel - [irqchip: irq/irqchip-next] irqchip/irq-bcm7038-l1: Gate use of CPU logical map to MIPS

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Date:   Wed, 20 Oct 2021 21:12:15 -0000
From:   "irqchip-bot for Florian Fainelli" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] irqchip/irq-bcm7038-l1: Gate use of CPU
 logical map to MIPS

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     35eb2ef5df42d3c3d2186ae6dab5622a31e6ceee
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/35eb2ef5df42d3c3d2186ae6dab5622a31e6ceee
Author:        Florian Fainelli <f.fainelli@...il.com>
AuthorDate:    Wed, 20 Oct 2021 11:48:50 -07:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Wed, 20 Oct 2021 20:06:33 +01:00

irqchip/irq-bcm7038-l1: Gate use of CPU logical map to MIPS

The use of the cpu_logical_map[] array is only relevant for MIPS based
platform where this driver is used as a first level interrupt controller
and contains multiple register groups to map with an associated CPU.

On ARM/ARM64 based systems this interrupt controller is present and used
as a second level interrupt controller hanging off the ARM GIC. That
copy of the interrupt controller contains a single group, resulting in
the intc->cpus[] array to be of size 1.

Things happened to work in that case because we install that interrupt
controller as a chained handler which does not allow it to be affine to
any CPU but the boot CPU which happens to be 0, therefore we never
de-reference past intc->cpus[] but with the current code in place, we do
leave a chance of de-referencing the array past its bounds.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20211020184859.2705451-5-f.fainelli@gmail.com
---
 drivers/irqchip/irq-bcm7038-l1.c |  9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-bcm7038-l1.c b/drivers/irqchip/irq-bcm7038-l1.c
index 14caf32..3c4e348 100644
--- a/drivers/irqchip/irq-bcm7038-l1.c
+++ b/drivers/irqchip/irq-bcm7038-l1.c
@@ -28,9 +28,6 @@
 #include <linux/irqchip.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/syscore_ops.h>
-#ifdef CONFIG_ARM
-#include <asm/smp_plat.h>
-#endif
 
 #define IRQS_PER_WORD		32
 #define REG_BYTES_PER_IRQ_WORD	(sizeof(u32) * 4)
@@ -127,7 +124,7 @@ static void bcm7038_l1_irq_handle(struct irq_desc *desc)
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int idx;
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_MIPS)
 	cpu = intc->cpus[cpu_logical_map(smp_processor_id())];
 #else
 	cpu = intc->cpus[0];
@@ -301,7 +298,7 @@ static int bcm7038_l1_suspend(void)
 	u32 val;
 
 	/* Wakeup interrupt should only come from the boot cpu */
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_MIPS)
 	boot_cpu = cpu_logical_map(0);
 #else
 	boot_cpu = 0;
@@ -325,7 +322,7 @@ static void bcm7038_l1_resume(void)
 	struct bcm7038_l1_chip *intc;
 	int boot_cpu, word;
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_MIPS)
 	boot_cpu = cpu_logical_map(0);
 #else
 	boot_cpu = 0;