Den 29.11.2019 11.29, skrev Jani Nikula: > Modifying fb_ops directly to override fb_mmap with fb_deferred_io_mmap > and then resetting it to NULL afterwards causes problems all over the > place. First, it prevents making the fbops member of struct fb_info a > const pointer, which means we can't make struct fb_ops const > anywhere. Second, a few places have to go out of their way to restore > the original fb_mmap pointer that gets reset to NULL. > > Since the only user of the fbops->fb_mmap hook is fb_mmap() in fbmem.c, > call fb_deferred_io_mmap() directly when deferred IO is enabled, and > avoid modifying fb_ops altogether. > > Simply use info->fbdefio to determine whether deferred IO should be used > or not. This should be accurate enough for all use cases, although > perhaps not pedantically correct. > > v2: Simplify considerably by calling fb_deferred_io_mmap() directly > (Daniel, Ville) > > Cc: Jaya Kumar <jayalk@xxxxxxxxxxxx> > Cc: linux-fbdev@xxxxxxxxxxxxxxx > Cc: Daniel Vetter <daniel@xxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > --- Nice simple solution: Acked-by: Noralf Trønnes <noralf@xxxxxxxxxxx> _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
