[Linux-stable-mirror] FAILED: patch "[PATCH] fpga: region: release of_parse_phandle nodes after use" failed to apply to 4.15-stable tree

The patch below does not apply to the 4.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 0f5eb1545907edeea7672a9c1652c4231150ff22 Mon Sep 17 00:00:00 2001

From: Ian Abbott abbotti@mev.co.uk Date: Wed, 15 Nov 2017 16:33:12 -0600 Subject: [PATCH] fpga: region: release of_parse_phandle nodes after use

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@vger.kernel.org # 4.10+ 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

diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c index c6b21194dcbc..119ff75522f1 100644 --- a/drivers/fpga/of-fpga-region.c +++ b/drivers/fpga/of-fpga-region.c @@ -73,6 +73,7 @@ static struct fpga_manager *of_fpga_region_get_mgr(struct device_node *np) 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; } @@ -120,10 +121,13 @@ static int of_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(info->overlay, "fpga-bridges", 0)) + br = of_parse_phandle(info->overlay, "fpga-bridges", 0); + if (br) { + of_node_put(br); np = info->overlay; - else + } else { np = region_np; + }

for (i = 0; ; i++) { br = of_parse_phandle(np, "fpga-bridges", i); @@ -131,12 +135,15 @@ static int of_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 = of_fpga_bridge_get_to_list(br, info, &region->bridge_list); + of_node_put(br);

/* If any of the bridges are in use, give up */ if (ret == -EBUSY) {