Comment # 1 on bug 94284 from Laurent carlier

Bisect gives me:

2b938a390c15a06be8cf706083890c822979508f is the first bad commit
commit 2b938a390c15a06be8cf706083890c822979508f
Author: Ilia Mirkin <imirkin@alum.mit.edu>
Date:   Thu Feb 18 01:04:13 2016 -0500

    st/mesa: fix pbo uploads

     - LOD must be provided in .w for TXF (even for buffer textures)
     - User buffer must be valid at draw time
     - Must have a sampler associated with the sampler view

    This makes PBO uploads work again on nouveau.

    Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
    Reviewed-by: Nicolai H�hnle <nicolai.haehnle@amd.com>

:040000 040000 ee1148bebe6a6658a6c4e26b9841e7eaf22805a3
3f90d6d20a63250fd784635976063f2da23217e2 M      src