On Tue, 2007-10-16 at 16:39 +0200, Thomas Renninger wrote:
> On Mon, 2007-10-15 at 17:48 +0100, Matthew Garrett wrote:
> > Why not just call acpi_get_pyhsical_device() on the appropriate handle
> > and look at the struct device you get back?
> Remember to put_device() it once you're done.
First read, then post..., forgot the put_device...
This one is better.
> Len can you apply this one, pls.
Thomas
Recent Lenovo ThinkPads define a dummy grahpics device, find it and ignore it
Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
---
drivers/acpi/video.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
Index: lenb/drivers/acpi/video.c
===================================================================
--- lenb.orig/drivers/acpi/video.c
+++ lenb/drivers/acpi/video.c
@@ -34,6 +34,7 @@
#include <linux/input.h>
#include <linux/backlight.h>
#include <linux/video_output.h>
+#include <linux/acpi.h>
#include <asm/uaccess.h>
#include <acpi/acpi_bus.h>
@@ -1901,11 +1902,25 @@ static int acpi_video_bus_add(struct acp
acpi_status status = 0;
struct acpi_video_bus *video = NULL;
struct input_dev *input;
+ struct device *dev;
if (!device)
return -EINVAL;
+ /*
+ * Check whether we have really a graphics device physically
+ * in the slot and registered at the system.
+ */
+ dev = acpi_get_physical_device(device->handle);
+ if (!dev) {
+ printk (KERN_DEBUG PREFIX "Video device %s.%s not physically"
+ " connected, ignoring\n", acpi_device_bid(device),
+ device->parent ? acpi_device_bid(device->parent) : "");
+ return -ENODEV;
+ }
+ put_device(dev);
+
video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
if (!video)
return -ENOMEM;
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