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drm: fail gracefully when proc isn't setup. 

If drm can't find proc it should fail more gracefully, than just
oopsing, this tests drm_class is NULL, and sets it to NULL in the
fail paths.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2012-07-06 18:06:42 +01:00
parent 12f0e670ff
commit 49099c4991
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/drm_sysfs.c
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@ -134,6 +134,7 @@ void drm_sysfs_destroy(void)
return;
class_remove_file(drm_class, &class_attr_version.attr);
class_destroy(drm_class);
drm_class = NULL;
}
/**
@ -554,6 +555,9 @@ void drm_sysfs_device_remove(struct drm_minor *minor)
int drm_class_device_register(struct device *dev)
{
if (!drm_class || IS_ERR(drm_class))
return -ENOENT;
dev->class = drm_class;
return device_register(dev);
}