pci: revert SMBus unhide on HP Compaq nx6110 (a99acc83) · Commits · 戴 / test

This reverts commit and fixes kernel bug #10245: http://bugzilla.kernel.org/show_bug.cgi?id=10245 The HP Compaq nc6120 has the same PCI sub-device ID as the nx6110, and the SMBus is used by ACPI for thermal management on the nc6120, so Linux should not attach a native driver to it. This means that this quirk is unsafe and has to be removed. I also added a comment to help developers realize that adding new IDs to this SMBus unhiding quirk table should be done only with great care, and in particular only after checking that ACPI is not making use of the SMBus. Signed-off-by:

Jean Delvare <khali@linux-fr.org> Cc: Tomasz Koprowski <tomek@koprowski.org> Acked-by:

Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

drivers/pci/quirks.c

+6 −5

Original line number	Diff line number	Diff line
		@@ -951,6 +951,12 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82375, quirk_e
		* accesses to the SMBus registers, with potentially bad effects. Thus you
		* should be very careful when adding new entries: if SMM is accessing the
		* Intel SMBus, this is a very good reason to leave it hidden.
		*
		* Likewise, many recent laptops use ACPI for thermal management. If the
		* ACPI DSDT code accesses the SMBus, then Linux should not access it
		* natively, and keeping the SMBus hidden is the right thing to do. If you
		* are about to add an entry in the table below, please first disassemble
		* the DSDT and double-check that there is no code accessing the SMBus.
		*/
		static int asus_hides_smbus;

		@@ -1028,11 +1034,6 @@ static void __init asus_hides_smbus_hostbridge(struct pci_dev *dev)
		case 0x12bf: /* HP xw4100 */
		asus_hides_smbus = 1;
		}
		else if (dev->device == PCI_DEVICE_ID_INTEL_82915GM_HB)
		switch (dev->subsystem_device) {
		case 0x099c: /* HP Compaq nx6110 */
		asus_hides_smbus = 1;
		}
		} else if (unlikely(dev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG)) {
		if (dev->device == PCI_DEVICE_ID_INTEL_82855PM_HB)
		switch(dev->subsystem_device) {

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