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authorJean Delvare <khali@linux-fr.org>2008-03-28 14:16:04 -0700
committerChris Wright <chrisw@sous-sol.org>2008-04-18 18:53:21 -0700
commit96c132f39fc8514e2bd2d56b95442879c56308fe (patch)
treec48e91bfe7b0862b687bee1a0354adce24b9707d
parent6ed609bc70e1cce983650707b0b7c12265ab96f6 (diff)
pci: revert SMBus unhide on HP Compaq nx6110
upstream commit: a99acc832de1104afaba02d7c2576fd9b9fd6422 This reverts commit 3c0a654e390d00fef9d8faed758f5e1e8078adb5 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> Signed-off-by: Chris Wright <chrisw@sous-sol.org>
-rw-r--r--drivers/pci/quirks.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 72e0bd5d80ac..05cdda9ab8a6 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -950,6 +950,12 @@ 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;
@@ -1022,11 +1028,6 @@ static void __init asus_hides_smbus_hostbridge(struct pci_dev *dev)
case 0x12bd: /* HP D530 */
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) {