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

[Alan Tull]

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 <at...@kernel.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