On Wed, Nov 11, 2015 at 07:24:40PM +0200, Ville Syrjälä wrote:
On Wed, Nov 11, 2015 at 05:20:10PM +0000, Chris Wilson wrote:
On Wed, Nov 11, 2015 at 07:11:28PM +0200, ville.syrjala@linux.intel.com wrote:
From: Ville Syrjälä ville.syrjala@linux.intel.com
We try to convert the old way of of specifying fb tiling (obj->tiling) into the new fb modifiers. We store the result in the passed in mode_cmd structure. But that structure comes directly from the addfb2 ioctl, and gets copied back out to userspace, which means we're clobbering the modifiers that the user provided (all 0 since the DRM_MODE_FB_MODIFIERS flag wasn't even set by the user). Hence if the user reuses the struct for another addfb2, the ioctl will be rejected since it's now asking for some modifiers w/o the flag set.
What do we actually pass back to userspace through the struct?
The fb id.
D'oh. Time to step away from the computer... -Chris