[1/6] crypto: omap-aes-gcm: fix failure with assocdata only

Message ID 20191105123759.25053-2-t-kristo@ti.com
State Superseded
Headers show
Series
  • [1/6] crypto: omap-aes-gcm: fix failure with assocdata only
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Commit Message

Tero Kristo Nov. 5, 2019, 12:37 p.m.
If we only have assocdata with an omap-aes-gcm, it currently just
completes it directly without passing it over to the crypto HW. This
produces wrong results.

Fix by passing the request down to the crypto HW, and fix the DMA
support code to accept a case where we don't expect any output data.
In the case where only assocdata is provided, it just passes through
the accelerator and provides authentication results, without any
encrypted/decrypted buffer via DMA.

Signed-off-by: Tero Kristo <t-kristo@ti.com>

---
 drivers/crypto/omap-aes-gcm.c |  2 +-
 drivers/crypto/omap-aes.c     | 67 +++++++++++++++++++++--------------
 2 files changed, 42 insertions(+), 27 deletions(-)

-- 
2.17.1

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

Patch

diff --git a/drivers/crypto/omap-aes-gcm.c b/drivers/crypto/omap-aes-gcm.c
index 6da05149b195..e92000846f16 100644
--- a/drivers/crypto/omap-aes-gcm.c
+++ b/drivers/crypto/omap-aes-gcm.c
@@ -244,7 +244,7 @@  static int omap_aes_gcm_handle_queue(struct omap_aes_dev *dd,
 
 	err = omap_aes_write_ctrl(dd);
 	if (!err) {
-		if (dd->in_sg_len && dd->out_sg_len)
+		if (dd->in_sg_len)
 			err = omap_aes_crypt_dma_start(dd);
 		else
 			omap_aes_gcm_dma_out_callback(dd);
diff --git a/drivers/crypto/omap-aes.c b/drivers/crypto/omap-aes.c
index c43121ec8b0b..a63ff4738466 100644
--- a/drivers/crypto/omap-aes.c
+++ b/drivers/crypto/omap-aes.c
@@ -269,13 +269,14 @@  static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
 			      struct scatterlist *out_sg,
 			      int in_sg_len, int out_sg_len)
 {
-	struct dma_async_tx_descriptor *tx_in, *tx_out;
+	struct dma_async_tx_descriptor *tx_in, *tx_out = NULL, *cb_desc;
 	struct dma_slave_config cfg;
 	int ret;
 
 	if (dd->pio_only) {
 		scatterwalk_start(&dd->in_walk, dd->in_sg);
-		scatterwalk_start(&dd->out_walk, dd->out_sg);
+		if (out_sg_len)
+			scatterwalk_start(&dd->out_walk, dd->out_sg);
 
 		/* Enable DATAIN interrupt and let it take
 		   care of the rest */
@@ -312,34 +313,45 @@  static int omap_aes_crypt_dma(struct omap_aes_dev *dd,
 
 	/* No callback necessary */
 	tx_in->callback_param = dd;
+	tx_in->callback = NULL;
 
 	/* OUT */
-	ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
-	if (ret) {
-		dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
-			ret);
-		return ret;
-	}
+	if (out_sg_len) {
+		ret = dmaengine_slave_config(dd->dma_lch_out, &cfg);
+		if (ret) {
+			dev_err(dd->dev, "can't configure OUT dmaengine slave: %d\n",
+				ret);
+			return ret;
+		}
 
-	tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg, out_sg_len,
-					DMA_DEV_TO_MEM,
-					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
-	if (!tx_out) {
-		dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
-		return -EINVAL;
+		tx_out = dmaengine_prep_slave_sg(dd->dma_lch_out, out_sg,
+						 out_sg_len,
+						 DMA_DEV_TO_MEM,
+						 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+		if (!tx_out) {
+			dev_err(dd->dev, "OUT prep_slave_sg() failed\n");
+			return -EINVAL;
+		}
+
+		cb_desc = tx_out;
+	} else {
+		cb_desc = tx_in;
 	}
 
 	if (dd->flags & FLAGS_GCM)
-		tx_out->callback = omap_aes_gcm_dma_out_callback;
+		cb_desc->callback = omap_aes_gcm_dma_out_callback;
 	else
-		tx_out->callback = omap_aes_dma_out_callback;
-	tx_out->callback_param = dd;
+		cb_desc->callback = omap_aes_dma_out_callback;
+	cb_desc->callback_param = dd;
+
 
 	dmaengine_submit(tx_in);
-	dmaengine_submit(tx_out);
+	if (tx_out)
+		dmaengine_submit(tx_out);
 
 	dma_async_issue_pending(dd->dma_lch_in);
-	dma_async_issue_pending(dd->dma_lch_out);
+	if (out_sg_len)
+		dma_async_issue_pending(dd->dma_lch_out);
 
 	/* start DMA */
 	dd->pdata->trigger(dd, dd->total);
@@ -361,11 +373,13 @@  int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
 			return -EINVAL;
 		}
 
-		err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
-				 DMA_FROM_DEVICE);
-		if (!err) {
-			dev_err(dd->dev, "dma_map_sg() error\n");
-			return -EINVAL;
+		if (dd->out_sg_len) {
+			err = dma_map_sg(dd->dev, dd->out_sg, dd->out_sg_len,
+					 DMA_FROM_DEVICE);
+			if (!err) {
+				dev_err(dd->dev, "dma_map_sg() error\n");
+				return -EINVAL;
+			}
 		}
 	}
 
@@ -373,8 +387,9 @@  int omap_aes_crypt_dma_start(struct omap_aes_dev *dd)
 				 dd->out_sg_len);
 	if (err && !dd->pio_only) {
 		dma_unmap_sg(dd->dev, dd->in_sg, dd->in_sg_len, DMA_TO_DEVICE);
-		dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
-			     DMA_FROM_DEVICE);
+		if (dd->out_sg_len)
+			dma_unmap_sg(dd->dev, dd->out_sg, dd->out_sg_len,
+				     DMA_FROM_DEVICE);
 	}
 
 	return err;