[PATCH] crypto: eip93 - use struct_size() and flexible array for ring allocation

[Rosen Penev <rosenp@gmail.com>]

Embed the single ring as a flexible array member in eip93_device
instead of allocating it separately. This simplifies the probe path
and uses struct_size() for a single allocation.

Assisted-by: opencode:big-pickle
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 .../crypto/inside-secure/eip93/eip93-main.c   |  6 +----
 .../crypto/inside-secure/eip93/eip93-main.h   | 22 +++++++++----------
 2 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/drivers/crypto/inside-secure/eip93/eip93-main.c b/drivers/crypto/inside-secure/eip93/eip93-main.c
index 1a8dabc4ada4..e62785952b0d 100644
--- a/drivers/crypto/inside-secure/eip93/eip93-main.c
+++ b/drivers/crypto/inside-secure/eip93/eip93-main.c
@@ -415,7 +415,7 @@ static int eip93_crypto_probe(struct platform_device *pdev)
 	u32 ver, algo_flags;
 	int ret;
 
-	eip93 = devm_kzalloc(dev, sizeof(*eip93), GFP_KERNEL);
+	eip93 = devm_kzalloc(dev, struct_size(eip93, ring, 1), GFP_KERNEL);
 	if (!eip93)
 		return -ENOMEM;
 
@@ -436,10 +436,6 @@ static int eip93_crypto_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	eip93->ring = devm_kcalloc(eip93->dev, 1, sizeof(*eip93->ring), GFP_KERNEL);
-	if (!eip93->ring)
-		return -ENOMEM;
-
 	ret = eip93_desc_init(eip93);
 	if (ret)
 		return ret;
diff --git a/drivers/crypto/inside-secure/eip93/eip93-main.h b/drivers/crypto/inside-secure/eip93/eip93-main.h
index 990c2401b7ce..5f0f51081743 100644
--- a/drivers/crypto/inside-secure/eip93/eip93-main.h
+++ b/drivers/crypto/inside-secure/eip93/eip93-main.h
@@ -92,17 +92,6 @@
 						    EIP93_HASH_SHA224 | \
 						    EIP93_HASH_SHA256))
 
-/**
- * struct eip93_device - crypto engine device structure
- */
-struct eip93_device {
-	void __iomem		*base;
-	struct device		*dev;
-	struct clk		*clk;
-	int			irq;
-	struct eip93_ring		*ring;
-};
-
 struct eip93_desc_ring {
 	void			*base;
 	void			*base_end;
@@ -131,6 +120,17 @@ struct eip93_ring {
 	struct idr			crypto_async_idr;
 };
 
+/**
+ * struct eip93_device - crypto engine device structure
+ */
+struct eip93_device {
+	void __iomem		*base;
+	struct device		*dev;
+	struct clk		*clk;
+	int			irq;
+	struct eip93_ring	ring[];
+};
+
 enum eip93_alg_type {
 	EIP93_ALG_TYPE_AEAD,
 	EIP93_ALG_TYPE_SKCIPHER,
-- 
2.55.0