Since 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.
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Lukas Wunner <lu...@wunner.de>
---
v2:
- Move amendment of nvidia_bugs quirk to separate patch to allow for
easier reviewing, bisecting and reverting (Bjorn Helgaas)
arch/x86/kernel/early-quirks.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
index bca14c8..256976f 100644
--- a/arch/x86/kernel/early-quirks.c
+++ b/arch/x86/kernel/early-quirks.c
@@ -76,6 +76,13 @@ static void __init nvidia_bugs(int num, int slot, int func)
#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.
--
2.8.1
