sumitsemwal/kernel-omap4 — comment on commit d22a71bdffb600c1f1ce1759e0382f9ca641328b
File: drivers/media/video/videobuf2-core.c line 1099
By robclark:

this should be put in a second loop, because this part of the loop is skipped if the dmabuf didn't change.. we want to map/unmap each time, even if we didn't attach a new buffer