linux-kernel - [PATCH v2 3/6] crypto: stm32/hash: Use existing busy poll function

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Message-Id: <20221227-ux500-stm32-hash-v2-3-bc443bc44ca4@linaro.org>
Date:   Tue, 10 Jan 2023 20:19:14 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
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>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Lionel Debieve <lionel.debieve@...s.st.com>
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,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 3/6] crypto: stm32/hash: Use existing busy poll function

When exporting state we are waiting indefinitely in the same
was as the ordinary stm32_hash_wait_busy() poll-for-completion
function but without a timeout, which means we could hang in
an eternal loop. Fix this by waiting for completion like the
rest of the code.

Acked-by: Lionel Debieve <lionel.debieve@...s.st.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
ChangeLog v1->v2:
- Pick up Lionel's ACK
---
 drivers/crypto/stm32/stm32-hash.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index 0473ced7b4ea..cc0a4e413a82 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -960,11 +960,13 @@ static int stm32_hash_export(struct ahash_request *req, void *out)
 	struct stm32_hash_dev *hdev = stm32_hash_find_dev(ctx);
 	u32 *preg;
 	unsigned int i;
+	int ret;
 
 	pm_runtime_get_sync(hdev->dev);
 
-	while ((stm32_hash_read(hdev, HASH_SR) & HASH_SR_BUSY))
-		cpu_relax();
+	ret = stm32_hash_wait_busy(hdev);
+	if (ret)
+		return ret;
 
 	rctx->hw_context = kmalloc_array(3 + HASH_CSR_REGISTER_NUMBER,
 					 sizeof(u32),

-- 
2.39.0