From: Alan Tull <atull@kernel.org>
Date: Wed, 15 Nov 2017 20:20:26 +0000 (-0600)
Subject: fpga: of-fpga-region: accept overlays that don't program FPGA
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=8a54167925341ab2a9c3133618dbddfc1a46f8aa;p=openwrt%2Fstaging%2Fblogic.git

fpga: of-fpga-region: accept overlays that don't program FPGA

The FPGA may already have a static image programmed when
Linux boots.  In that case a DT overlay may be used to add
the devices that already exist.  This commit allows that
by shuffling the order of some checks.

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@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 1533506ef0e4..c6b21194dcbc 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -298,18 +298,19 @@ static int of_fpga_region_notify_pre_apply(struct fpga_region *region,
 	struct fpga_image_info *info;
 	int ret;
 
-	if (region->info) {
-		dev_err(dev, "Region already has overlay applied.\n");
-		return -EINVAL;
-	}
-
 	info = of_fpga_region_parse_ov(region, nd->overlay);
 	if (IS_ERR(info))
 		return PTR_ERR(info);
 
+	/* If overlay doesn't program the FPGA, accept it anyway. */
 	if (!info)
 		return 0;
 
+	if (region->info) {
+		dev_err(dev, "Region already has overlay applied.\n");
+		return -EINVAL;
+	}
+
 	region->info = info;
 	ret = fpga_region_program_fpga(region);
 	if (ret) {