linux-kernel - [tip: x86/apic] x86/ioapic: Correct the PCI/ISA trigger type selection

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Date:   Tue, 10 Nov 2020 17:47:29 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Borislav Petkov <bp@...en8.de>, Qian Cai <cai@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/apic] x86/ioapic: Correct the PCI/ISA trigger type selection

The following commit has been merged into the x86/apic branch of tip:

Commit-ID:     aec8da04e4d71afdd4ab3025ea34a6517435f363
Gitweb:        https://git.kernel.org/tip/aec8da04e4d71afdd4ab3025ea34a6517435f363
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 10 Nov 2020 15:34:32 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 10 Nov 2020 18:43:22 +01:00

x86/ioapic: Correct the PCI/ISA trigger type selection

PCI's default trigger type is level and ISA's is edge. The recent
refactoring made it the other way round, which went unnoticed as it seems
only to cause havoc on some AMD systems.

Make the comment and code do the right thing again.

Fixes: a27dca645d2c ("x86/io_apic: Cleanup trigger/polarity helpers")
Reported-by: Tom Lendacky <thomas.lendacky@....com>
Reported-by: Borislav Petkov <bp@...en8.de>
Reported-by: Qian Cai <cai@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Tom Lendacky <thomas.lendacky@....com>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Link: https://lore.kernel.org/r/87d00lgu13.fsf@nanos.tec.linutronix.de
---
 arch/x86/kernel/apic/io_apic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 0602c95..089e755 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -809,9 +809,9 @@ static bool irq_is_level(int idx)
 	case MP_IRQTRIG_DEFAULT:
 		/*
 		 * Conforms to spec, ie. bus-type dependent trigger
-		 * mode. PCI defaults to egde, ISA to level.
+		 * mode. PCI defaults to level, ISA to edge.
 		 */
-		level = test_bit(bus, mp_bus_not_pci);
+		level = !test_bit(bus, mp_bus_not_pci);
 		/* Take EISA into account */
 		return eisa_irq_is_level(idx, bus, level);
 	case MP_IRQTRIG_EDGE: