linux-kernel - [PATCH v2 09/16] fpga: region: fix slow warning with more than one overlay

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Date:   Thu, 20 Apr 2017 09:09:54 -0500
From:   Alan Tull <atull@...nel.org>
To:     Moritz Fischer <moritz.fischer@...us.com>
Cc:     Alan Tull <atull@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: [PATCH v2 09/16] fpga: region: fix slow warning with more than one overlay

Prevent applying more than one overlay to a region.

This fixes a slow warning that happens when more than
one overlay is applied and then removed.

Signed-off-by: Alan Tull <atull@...nel.org>
---
v2: split out from another patch
---
 drivers/fpga/fpga-region.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index c2730a8..d6f2313 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -355,6 +355,11 @@ static int fpga_region_notify_pre_apply(struct fpga_region *region,
 	const char *firmware_name;
 	int ret;
 
+	if (region->info) {
+		dev_err(dev, "Region already has overlay applied.\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Reject overlay if child FPGA Regions added in the overlay have
 	 * firmware-name property (would mean that an FPGA region that has
-- 
2.7.4