4.15-stable review patch. If anyone has any objections, please let me know.
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From: Ian Abbott abbotti@mev.co.uk
commit 0f5eb1545907edeea7672a9c1652c4231150ff22 upstream.
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") Signed-off-by: Ian Abbott abbotti@mev.co.uk Signed-off-by: Alan Tull atull@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/fpga/fpga-region.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
--- a/drivers/fpga/fpga-region.c +++ b/drivers/fpga/fpga-region.c @@ -147,6 +147,7 @@ static struct fpga_manager *fpga_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(struc 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(struc 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) {