linux-kernel - [PATCH v2] crypto: ccree - Remove a useless dma

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Date:   Wed, 20 Jul 2022 15:28:44 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Gilad Ben-Yossef <gilad@...yossef.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Christoph Hellwig <hch@...radead.org>,
        linux-crypto@...r.kernel.org
Subject: [PATCH v2] crypto: ccree - Remove a useless dma_supported() call

There is no point in calling dma_supported() before calling
dma_set_coherent_mask(). This function already calls dma_supported() and
returns an error (-EIO) if it fails.

So remove the superfluous dma_supported() call.

Moreover, setting a larger DMA mask will never fail when setting a smaller
one will succeed, so the whole "while" loop can be removed as well. (see
[1])

While at it, fix the name of the function reported in a dev_err().

[1]: https://lore.kernel.org/all/YteQ6Vx2C03UtCkG@infradead.org/

Suggested-by: Christoph Hellwig <hch@...radead.org>
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/crypto/ccree/cc_driver.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/drivers/crypto/ccree/cc_driver.c b/drivers/crypto/ccree/cc_driver.c
index 7d1bee86d581..cadead18b59e 100644
--- a/drivers/crypto/ccree/cc_driver.c
+++ b/drivers/crypto/ccree/cc_driver.c
@@ -372,17 +372,10 @@ static int init_cc_resources(struct platform_device *plat_dev)
 		dev->dma_mask = &dev->coherent_dma_mask;
 
 	dma_mask = DMA_BIT_MASK(DMA_BIT_MASK_LEN);
-	while (dma_mask > 0x7fffffffUL) {
-		if (dma_supported(dev, dma_mask)) {
-			rc = dma_set_coherent_mask(dev, dma_mask);
-			if (!rc)
-				break;
-		}
-		dma_mask >>= 1;
-	}
-
+	rc = dma_set_coherent_mask(dev, dma_mask);
 	if (rc) {
-		dev_err(dev, "Failed in dma_set_mask, mask=%llx\n", dma_mask);
+		dev_err(dev, "Failed in dma_set_coherent_mask, mask=%llx\n",
+			dma_mask);
 		return rc;
 	}
 
-- 
2.34.1