crypto: stm32 - remove flag HASH_FLAGS_DMA_READY

Remove flag HASH_FLAGS_DMA_READY as it can put the driver in a deadlock
state.
If the DMA automatically set the DCAL bit, the interrupt indicating the
end of a computation can be raised before the DMA complete sequence.
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/stm32/stm32-hash.c

@@ -84,12 +84,11 @@
 #define HASH_FLAGS_INIT			BIT(0)
 #define HASH_FLAGS_OUTPUT_READY		BIT(1)
 #define HASH_FLAGS_CPU			BIT(2)
-#define HASH_FLAGS_DMA_READY		BIT(3)
-#define HASH_FLAGS_DMA_ACTIVE		BIT(4)
-#define HASH_FLAGS_HMAC_INIT		BIT(5)
-#define HASH_FLAGS_HMAC_FINAL		BIT(6)
-#define HASH_FLAGS_HMAC_KEY		BIT(7)
-#define HASH_FLAGS_SHA3_MODE		BIT(8)
+#define HASH_FLAGS_DMA_ACTIVE		BIT(3)
+#define HASH_FLAGS_HMAC_INIT		BIT(4)
+#define HASH_FLAGS_HMAC_FINAL		BIT(5)
+#define HASH_FLAGS_HMAC_KEY		BIT(6)
+#define HASH_FLAGS_SHA3_MODE		BIT(7)
 #define HASH_FLAGS_FINAL		BIT(15)
 #define HASH_FLAGS_FINUP		BIT(16)
 #define HASH_FLAGS_ALGO_MASK		GENMASK(20, 17)
@@ -585,8 +584,6 @@ static void stm32_hash_dma_callback(void *param)
 	struct stm32_hash_dev *hdev = param;
 
 	complete(&hdev->dma_completion);
-
-	hdev->flags |= HASH_FLAGS_DMA_READY;
 }
 
 static int stm32_hash_hmac_dma_send(struct stm32_hash_dev *hdev)
@@ -1241,12 +1238,10 @@ static irqreturn_t stm32_hash_irq_thread(int irq, void *dev_id)
 			hdev->flags &= ~HASH_FLAGS_OUTPUT_READY;
 			goto finish;
 		}
-	} else if (HASH_FLAGS_DMA_READY & hdev->flags) {
-		if (HASH_FLAGS_DMA_ACTIVE & hdev->flags) {
+	} else if (HASH_FLAGS_DMA_ACTIVE & hdev->flags) {
 		hdev->flags &= ~HASH_FLAGS_DMA_ACTIVE;
 			goto finish;
 	}
-	}
 
 	return IRQ_HANDLED;