From: Natalie.Protasevich@unisys.com Date: Fri, 29 Jul 2005 21:03:32 +0000 (-0700) Subject: [PATCH] x86: avoid wasting IRQs patch update X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e1afc3f522ed088405fc8932110d338330db82bb;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] x86: avoid wasting IRQs patch update The patch addresses a problem with ACPI SCI interrupt entry, which gets re-used, and the IRQ is assigned to another unrelated device. The patch corrects the code such that SCI IRQ is skipped and duplicate entry is avoided. Second issue came up with VIA chipset, the problem was caused by original patch assigning IRQs starting 16 and up. The VIA chipset uses 4-bit IRQ register for internal interrupt routing, and therefore cannot handle IRQ numbers assigned to its devices. The patch corrects this problem by allowing PCI IRQs below 16. Signed-off by: Natalie Protasevich Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c index af917f609c7..ce838abb27d 100644 --- a/arch/i386/kernel/mpparse.c +++ b/arch/i386/kernel/mpparse.c @@ -1116,7 +1116,15 @@ int mp_register_gsi (u32 gsi, int edge_level, int active_high_low) */ int irq = gsi; if (gsi < MAX_GSI_NUM) { - gsi = pci_irq++; + if (gsi > 15) + gsi = pci_irq++; +#ifdef CONFIG_ACPI_BUS + /* + * Don't assign IRQ used by ACPI SCI + */ + if (gsi == acpi_fadt.sci_int) + gsi = pci_irq++; +#endif gsi_to_irq[irq] = gsi; } else { printk(KERN_ERR "GSI %u is too high\n", gsi);