fpga: do not access region struct after fpga_region_unregister

A couple drivers were accessing the region struct after it had been
freed.  Save off the pointer to the mgr before the region struct gets
freed.

Signed-off-by: Alan Tull <atull@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 5 insertions, 2 deletions

diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
index 0b7e19c27c6d..51a5ac2293a7 100644
--- a/drivers/fpga/dfl-fme-region.c
+++ b/drivers/fpga/dfl-fme-region.c
@@ -14,6 +14,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/fpga/fpga-mgr.h>
 #include <linux/fpga/fpga-region.h>
 
 #include "dfl-fme-pr.h"
@@ -66,9 +67,10 @@ eprobe_mgr_put:
 static int fme_region_remove(struct platform_device *pdev)
 {
         struct fpga_region *region = dev_get_drvdata(&pdev->dev);
+        struct fpga_manager *mgr = region->mgr;
 
         fpga_region_unregister(region);
-        fpga_mgr_put(region->mgr);
+        fpga_mgr_put(mgr);
 
         return 0;
 }
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 35fabb8083fb..052a1342ab7e 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -437,9 +437,10 @@ eprobe_mgr_put:
 static int of_fpga_region_remove(struct platform_device *pdev)
 {
         struct fpga_region *region = platform_get_drvdata(pdev);
+        struct fpga_manager *mgr = region->mgr;
 
         fpga_region_unregister(region);
-        fpga_mgr_put(region->mgr);
+        fpga_mgr_put(mgr);
 
         return 0;
 }