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Message-ID: <lsq.1479082447.331851194@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:07 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Peter Zijlstra" <peterz@...radead.org>,
        "Ingo Molnar" <mingo@...nel.org>,
        "Yinghai Lu" <yinghai@...nel.org>,
        "Bjorn Helgaas" <bhelgaas@...gle.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Josh Poimboeuf" <jpoimboe@...hat.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, "Lukas Wunner" <lukas@...ner.de>,
        "Denys Vlasenko" <dvlasenk@...hat.com>,
        "Brian Gerst" <brgerst@...il.com>, "Borislav Petkov" <bp@...en8.de>
Subject: [PATCH 3.2 015/152] x86/quirks: Apply nvidia_bugs quirk only on
 root bus

3.2.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Lukas Wunner <lukas@...ner.de>

commit 447d29d1d3aed839e74c2401ef63387780ac51ed upstream.

Since the following commit:

  8659c406ade3 ("x86: only scan the root bus in early PCI quirks")

... early quirks are only applied to devices on the root bus.

The motivation was to prevent application of the nvidia_bugs quirk on
secondary buses.

We're about to reintroduce scanning of secondary buses for a quirk to
reset the Broadcom 4331 wireless card on 2011/2012 Macs. To prevent
regressions, open code the requirement to apply nvidia_bugs only on the
root bus.

Signed-off-by: Lukas Wunner <lukas@...ner.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Yinghai Lu <yinghai@...nel.org>
Link: http://lkml.kernel.org/r/4d5477c1d76b2f0387a780f2142bbcdd9fee869b.1465690253.git.lukas@wunner.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/x86/kernel/early-quirks.c | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -73,6 +73,13 @@ static void __init nvidia_bugs(int num,
 #ifdef CONFIG_ACPI
 #ifdef CONFIG_X86_IO_APIC
 	/*
+	 * Only applies to Nvidia root ports (bus 0) and not to
+	 * Nvidia graphics cards with PCI ports on secondary buses.
+	 */
+	if (num)
+		return;
+
+	/*
 	 * All timer overrides on Nvidia are
 	 * wrong unless HPET is enabled.
 	 * Unfortunately that's not true on many Asus boards.

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