linux-kernel - [PATCH 2/3] crypto: atmel-sha - Retire dma_request_slave_channel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Thu, 21 Nov 2019 09:27:22 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <ludovic.desroches@...rochip.com>
CC:     <vkoul@...nel.org>, <linux-crypto@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/3] crypto: atmel-sha - Retire dma_request_slave_channel_compat()

The driver no longer boots in legacy mode, only via DT. This makes the
dma_request_slave_channel_compat() redundant.
If ever the filter function would be executed it will return false as the
dma_slave is not really initialized.

Switch to use dma_request_chan() which would allow legacy boot if ever
needed again by configuring dma_slave_map for the DMA driver.

At the same time skip allocating memory for dma_slave as it is not used
anymore.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/crypto/atmel-sha.c | 39 +++++++-------------------------------
 1 file changed, 7 insertions(+), 32 deletions(-)

diff --git a/drivers/crypto/atmel-sha.c b/drivers/crypto/atmel-sha.c
index 8ea0e4bcde0d..9d392c5ff06b 100644
--- a/drivers/crypto/atmel-sha.c
+++ b/drivers/crypto/atmel-sha.c
@@ -2608,32 +2608,16 @@ static int atmel_sha_register_algs(struct atmel_sha_dev *dd)
 	return err;
 }
 
-static bool atmel_sha_filter(struct dma_chan *chan, void *slave)
-{
-	struct at_dma_slave	*sl = slave;
-
-	if (sl && sl->dma_dev == chan->device->dev) {
-		chan->private = sl;
-		return true;
-	} else {
-		return false;
-	}
-}
-
 static int atmel_sha_dma_init(struct atmel_sha_dev *dd,
 				struct crypto_platform_data *pdata)
 {
-	dma_cap_mask_t mask_in;
+	dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
+	if (IS_ERR(dd->dma_lch_in.chan)) {
+		int ret = PTR_ERR(dd->dma_lch_in.chan);
 
-	/* Try to grab DMA channel */
-	dma_cap_zero(mask_in);
-	dma_cap_set(DMA_SLAVE, mask_in);
-
-	dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask_in,
-			atmel_sha_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
-	if (!dd->dma_lch_in.chan) {
-		dev_warn(dd->dev, "no DMA channel available\n");
-		return -ENODEV;
+		if (ret != -EPROBE_DEFER)
+			dev_warn(dd->dev, "no DMA channel available\n");
+		return ret;
 	}
 
 	dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
@@ -2724,12 +2708,6 @@ static struct crypto_platform_data *atmel_sha_of_init(struct platform_device *pd
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);
 
-	pdata->dma_slave = devm_kzalloc(&pdev->dev,
-					sizeof(*(pdata->dma_slave)),
-					GFP_KERNEL);
-	if (!pdata->dma_slave)
-		return ERR_PTR(-ENOMEM);
-
 	return pdata;
 }
 #else /* CONFIG_OF */
@@ -2823,10 +2801,7 @@ static int atmel_sha_probe(struct platform_device *pdev)
 				goto iclk_unprepare;
 			}
 		}
-		if (!pdata->dma_slave) {
-			err = -ENXIO;
-			goto iclk_unprepare;
-		}
+
 		err = atmel_sha_dma_init(sha_dd, pdata);
 		if (err)
 			goto err_sha_dma;
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki