Commit a99acc83 authored by Jean Delvare's avatar Jean Delvare Committed by Linus Torvalds

pci: revert SMBus unhide on HP Compaq nx6110

This reverts commit 3c0a654e 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: default avatarJean Delvare <khali@linux-fr.org>
Cc: Tomasz Koprowski <tomek@koprowski.org>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5ac7ec85
......@@ -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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