linux-kernel - [tip: irq/urgent] irqchip/sifive-plic: Fix maximum priority threshold value

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Date:   Fri, 17 Apr 2020 09:56:44 -0000
From:   "tip-bot2 for Atish Patra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>, Marc Zyngier <maz@...nel.org>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: irq/urgent] irqchip/sifive-plic: Fix maximum priority threshold value

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     d727be7bbf7b68ccc18a3278469325d8f486d75b
Gitweb:        https://git.kernel.org/tip/d727be7bbf7b68ccc18a3278469325d8f486d75b
Author:        Atish Patra <atish.patra@....com>
AuthorDate:    Thu, 02 Apr 2020 18:46:09 -07:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Fri, 17 Apr 2020 08:59:28 +01:00

irqchip/sifive-plic: Fix maximum priority threshold value

As per the PLIC specification, maximum priority threshold value is 0x7
not 0xF. Even though it doesn't cause any error in qemu/hifive unleashed,
there may be some implementation which checks the upper bound resulting in
an illegal access.

Fixes: ccbe80bad571 ("irqchip/sifive-plic: Enable/Disable external interrupts upon cpu online/offline")
Signed-off-by: Atish Patra <atish.patra@....com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20200403014609.71831-1-atish.patra@wdc.com
---
 drivers/irqchip/irq-sifive-plic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index c34fb3a..d0a71fe 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -56,7 +56,7 @@
 #define     CONTEXT_THRESHOLD		0x00
 #define     CONTEXT_CLAIM		0x04
 
-#define	PLIC_DISABLE_THRESHOLD		0xf
+#define	PLIC_DISABLE_THRESHOLD		0x7
 #define	PLIC_ENABLE_THRESHOLD		0
 
 struct plic_priv {