On Fri, Oct 27, 2017 at 11:56 AM, Ian Abbott <abbotti@xxxxxxxxx> wrote: Hi Ian, Looks good. Thanks for catching this! Alan > Both fpga_region_get_manager() and fpga_region_get_bridges() call > of_parse_phandle(), but nothing calls of_node_put() on the returned > struct device_node pointers. Make sure to do that to stop their > reference counters getting out of whack. > > Fixes: 0fa20cdfcc1f ("fpga: fpga-region: device tree control for FPGA") > Cc: <stable@xxxxxxxxxxxxxxx> # 4.10+ > Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx> Signed-off-by: Alan Tull <atull@xxxxxxxxxx> > --- > drivers/fpga/fpga-region.c | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > > diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c > index d9ab7c75b14f..e0c73ceba2ed 100644 > --- a/drivers/fpga/fpga-region.c > +++ b/drivers/fpga/fpga-region.c > @@ -147,6 +147,7 @@ static struct fpga_manager *fpga_region_get_manager(struct fpga_region *region) > mgr_node = of_parse_phandle(np, "fpga-mgr", 0); > if (mgr_node) { > mgr = of_fpga_mgr_get(mgr_node); > + of_node_put(mgr_node); > of_node_put(np); > return mgr; > } > @@ -192,10 +193,13 @@ static int fpga_region_get_bridges(struct fpga_region *region, > parent_br = region_np->parent; > > /* If overlay has a list of bridges, use it. */ > - if (of_parse_phandle(overlay, "fpga-bridges", 0)) > + br = of_parse_phandle(overlay, "fpga-bridges", 0); > + if (br) { > + of_node_put(br); > np = overlay; > - else > + } else { > np = region_np; > + } > > for (i = 0; ; i++) { > br = of_parse_phandle(np, "fpga-bridges", i); > @@ -203,12 +207,15 @@ static int fpga_region_get_bridges(struct fpga_region *region, > break; > > /* If parent bridge is in list, skip it. */ > - if (br == parent_br) > + if (br == parent_br) { > + of_node_put(br); > continue; > + } > > /* If node is a bridge, get it and add to list */ > ret = fpga_bridge_get_to_list(br, region->info, > ®ion->bridge_list); > + of_node_put(br); > > /* If any of the bridges are in use, give up */ > if (ret == -EBUSY) { > -- > 2.14.2 >