linux-kernel - [PATCH 5.6 242/254] powerpc/xive: Fix xmon support on the PowerNV platform

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Date:   Thu, 16 Apr 2020 15:25:31 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Cédric Le Goater <clg@...d.org>,
        Greg Kurz <groug@...d.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.6 242/254] powerpc/xive: Fix xmon support on the PowerNV platform

From: Cédric Le Goater <clg@...d.org>

commit 97ef275077932c65b1b8ec5022abd737a9fbf3e0 upstream.

The PowerNV platform has multiple IRQ chips and the xmon command
dumping the state of the XIVE interrupt should only operate on the
XIVE IRQ chip.

Fixes: 5896163f7f91 ("powerpc/xmon: Improve output of XIVE interrupts")
Cc: stable@...r.kernel.org # v5.4+
Signed-off-by: Cédric Le Goater <clg@...d.org>
Reviewed-by: Greg Kurz <groug@...d.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Link: https://lore.kernel.org/r/20200306150143.5551-3-clg@kaod.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/sysdev/xive/common.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -258,11 +258,15 @@ notrace void xmon_xive_do_dump(int cpu)
 
 int xmon_xive_get_irq_config(u32 hw_irq, struct irq_data *d)
 {
+	struct irq_chip *chip = irq_data_get_irq_chip(d);
 	int rc;
 	u32 target;
 	u8 prio;
 	u32 lirq;
 
+	if (!is_xive_irq(chip))
+		return -EINVAL;
+
 	rc = xive_ops->get_irq_config(hw_irq, &target, &prio, &lirq);
 	if (rc) {
 		xmon_printf("IRQ 0x%08x : no config rc=%d\n", hw_irq, rc);