[PATCH v4 11/19] fpga: dfl: convert features from flexible array member to separate array

[Peter Colberg <peter.colberg@intel.com>]

Use a separate array allocation for features and substitute a pointer
for the flexible array member in the feature device data. A subsequent
commit will add another array for resources. The current commit converts
the flexible array member to a separate allocation for consistency.

Signed-off-by: Peter Colberg <peter.colberg@intel.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Reviewed-by: Basheer Ahmed Muddebihal <basheer.ahmed.muddebihal@linux.intel.com>
---
Changes since v3:
- New patch extracted from last patch of v3 series.
---
 drivers/fpga/dfl.c | 7 ++++++-
 drivers/fpga/dfl.h | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index 4268a61bb9f7..094bba647085 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -752,10 +752,15 @@ binfo_create_feature_dev_data(struct build_feature_devs_info *binfo)
 	if (WARN_ON_ONCE(type >= DFL_ID_MAX))
 		return ERR_PTR(-EINVAL);
 
-	fdata = devm_kzalloc(binfo->dev, struct_size(fdata, features, binfo->feature_num), GFP_KERNEL);
+	fdata = devm_kzalloc(binfo->dev, sizeof(*fdata), GFP_KERNEL);
 	if (!fdata)
 		return ERR_PTR(-ENOMEM);
 
+	fdata->features = devm_kcalloc(binfo->dev, binfo->feature_num,
+				       sizeof(*fdata->features), GFP_KERNEL);
+	if (!fdata->features)
+		return ERR_PTR(-ENOMEM);
+
 	fdata->dev = fdev;
 	fdata->type = type;
 	fdata->num = binfo->feature_num;
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index bcbdfcdb9742..d2765555e109 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -330,7 +330,7 @@ struct dfl_feature_dev_data {
 	int open_count;
 	void *private;
 	int num;
-	struct dfl_feature features[];
+	struct dfl_feature *features;
 };
 
 /**
-- 
2.47.0