From: Rob Clark robdclark@gmail.com
Include the minor device id in the bus-id to give userspace a way to open the correct "cardN" when there are multiple device instances. --- It may seem a bit strange to have multiple platform device instances, but we have a use-case for this. And this relatively simple patch does the trick.
drivers/gpu/drm/drm_ioctl.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 47db4df..075024b 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -165,14 +165,15 @@ static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv) drm_unset_busid(dev, master);
if (drm_core_check_feature(dev, DRIVER_USE_PLATFORM_DEVICE)) { - master->unique_len = 10 + strlen(dev->platformdev->name); + master->unique_len = 13 + strlen(dev->platformdev->name); + master->unique_size = master->unique_len; master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
if (master->unique == NULL) return -ENOMEM;
len = snprintf(master->unique, master->unique_len, - "platform:%s", dev->platformdev->name); + "platform:%s:%02d", dev->platformdev->name, dev->primary->index);
if (len > master->unique_len) { DRM_ERROR("Unique buffer overflowed\n");