[PATCH] x86: Fix verify_quirk_intel_irqbalance() (16d279d2) · Commits · 戴 / test

arch/i386/kernel/quirks.c

+29 −4

Original line number	Diff line number	Diff line
		@@ -10,6 +10,26 @@
		#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
		static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)
		{
		u8 config, rev;
		u32 word;

		/* BIOS may enable hardware IRQ balancing for
		* E7520/E7320/E7525(revision ID 0x9 and below)
		* based platforms.
		* For those platforms, make sure that the genapic is set to 'flat'
		*/
		pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
		if (rev > 0x9)
		return;

		/* enable access to config space*/
		pci_read_config_byte(dev, 0xf4, &config);
		pci_write_config_byte(dev, 0xf4, config\|0x2);

		/* read xTPR register */
		raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);

		if (!(word & (1 << 13))) {
		#ifdef CONFIG_X86_64
		if (genapic != &apic_flat)
		panic("APIC mode must be flat on this system\n");
		@@ -19,6 +39,11 @@ static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)
		#endif
		}

		/* put back the original value for config space*/
		if (!(config & 0x2))
		pci_write_config_byte(dev, 0xf4, config);
		}

		void __init quirk_intel_irqbalance(void)
		{
		u8 config, rev;