From 29a4f067f96ca79c1090e09c1bb83f3c167b43ac Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Fri, 2 Nov 2012 14:02:40 +0000 Subject: [PATCH] x86: hpet: Fix masking of MSI interrupts commit 6acf5a8c931da9d26c8dd77d784daaf07fa2bff0 upstream. HPET_TN_FSB is not a proper mask bit; it merely toggles between MSI and legacy interrupt delivery. The proper mask bit is HPET_TN_ENABLE, so use both bits when (un)masking the interrupt. Signed-off-by: Jan Beulich Link: http://lkml.kernel.org/r/5093E09002000078000A60E6@nat28.tlf.novell.com Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/hpet.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c index aa083d350746..0aa649ee563b 100644 --- a/arch/x86/kernel/hpet.c +++ b/arch/x86/kernel/hpet.c @@ -427,7 +427,7 @@ void hpet_msi_unmask(struct irq_data *data) /* unmask it */ cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); - cfg |= HPET_TN_FSB; + cfg |= HPET_TN_ENABLE | HPET_TN_FSB; hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); } @@ -438,7 +438,7 @@ void hpet_msi_mask(struct irq_data *data) /* mask it */ cfg = hpet_readl(HPET_Tn_CFG(hdev->num)); - cfg &= ~HPET_TN_FSB; + cfg &= ~(HPET_TN_ENABLE | HPET_TN_FSB); hpet_writel(cfg, HPET_Tn_CFG(hdev->num)); } -- 2.34.1