linux-kernel - [PATCH v2 7/7] crypto: stm32 - remove flag HASH_FLAGS_DMA

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Date:   Thu, 13 Jul 2023 17:15:18 +0200
From:   Thomas BOURGOIN <thomas.bourgoin@...s.st.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Lionel Debieve <lionel.debieve@...s.st.com>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     <linux-crypto@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Thomas Bourgoin <thomas.bourgoin@...s.st.com>
Subject: [PATCH v2 7/7] crypto: stm32 - remove flag HASH_FLAGS_DMA_READY

From: Thomas Bourgoin <thomas.bourgoin@...s.st.com>

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@...s.st.com>
---
 drivers/crypto/stm32/stm32-hash.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index a48e6a14da2e..88a186c3dd78 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/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)
@@ -1241,11 +1238,9 @@ 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) {
-			hdev->flags &= ~HASH_FLAGS_DMA_ACTIVE;
-				goto finish;
-		}
+	} else if (HASH_FLAGS_DMA_ACTIVE & hdev->flags) {
+		hdev->flags &= ~HASH_FLAGS_DMA_ACTIVE;
+			goto finish;
 	}
 
 	return IRQ_HANDLED;
-- 
2.25.1