From: Kenji Kaneshige Date: Mon, 10 Nov 2008 04:54:43 +0000 (+0900) Subject: PCI: ignore bit0 of _OSC return code X-Git-Tag: v2.6.28-rc5~18^2 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2485b8674bf5762822e14e1554938e36511c0ae4;p=pandora-kernel.git PCI: ignore bit0 of _OSC return code Currently acpi_run_osc() checks all the bits in _OSC result code (the first DWORD in the capabilities buffer) to see error condition. But the bit 0, which doesn't indicate any error, must be ignored. The bit 0 is used as the query flag at _OSC invocation time. Some platforms clear it during _OSC evaluation, but the others don't. On latter platforms, current acpi_run_osc() mis-detects error when _OSC is evaluated with query flag set because it doesn't ignore the bit 0. Because of this, the __acpi_query_osc() always fails on such platforms. And this is the cause of the problem that pci_osc_control_set() doesn't work since the commit 4e39432f4df544d3dfe4fc90a22d87de64d15815 which changed pci_osc_control_set() to use __acpi_query_osc(). Tested-by:"Tomasz Czernecki Signed-off-by: Kenji Kaneshige Signed-off-by: Jesse Barnes --- Reading git-diff-tree failed