2.6.37-stable review patch. If anyone has any objections, please let us know.
------------------ From: Chris Wilson <[email protected]> commit 5fe49d86f9d01044abf687a8cd21edef636d58aa upstream. Early chipsets (gen2/3) used function 1 as a placeholder for multi-head. We used to ignore these since they were not assigned to PCI_CLASS_DISPLAY_VGA. However with 934f992c7 we attempt to bind to all Intel PCI_CLASS_DISPLAY devices (and functions) to work in multi-gpu systems. This fails hard on gen2/3. Reported-by: Ferenc Wágner <[email protected]> Tested-by: Ferenc Wágner <[email protected]> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=28012 Signed-off-by: Chris Wilson <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/gpu/drm/i915/i915_drv.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -501,6 +501,14 @@ int i915_reset(struct drm_device *dev, u static int __devinit i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { + /* Only bind to function 0 of the device. Early generations + * used function 1 as a placeholder for multi-head. This causes + * us confusion instead, especially on the systems where both + * functions have the same PCI-ID! + */ + if (PCI_FUNC(pdev->devfn)) + return -ENODEV; + return drm_get_pci_dev(pdev, ent, &driver); }
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