crypto: caam - fix DMA mapping direction for RSA forms 2 & 3

Crypto engine needs some temporary locations in external memory for
running RSA decrypt forms 2 and 3 (CRT).
These are named "tmp1" and "tmp2" in the PDB.

Update DMA mapping direction of tmp1 and tmp2 from TO_DEVICE to
BIDIRECTIONAL, since engine needs r/w access.

Cc: <stable@vger.kernel.org> # 4.13+
Fixes: 52e26d77 ("crypto: caam - add support for RSA key form 2")
Fixes: 4a651b12 ("crypto: caam - add support for RSA key form 3")
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/caampkc.c

@@ -71,8 +71,8 @@ static void rsa_priv_f2_unmap(struct device *dev, struct rsa_edesc *edesc,
 	dma_unmap_single(dev, pdb->d_dma, key->d_sz, DMA_TO_DEVICE);
 	dma_unmap_single(dev, pdb->p_dma, p_sz, DMA_TO_DEVICE);
 	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
-	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_TO_DEVICE);
-	dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
+	dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
 }
 
 static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
@@ -90,8 +90,8 @@ static void rsa_priv_f3_unmap(struct device *dev, struct rsa_edesc *edesc,
 	dma_unmap_single(dev, pdb->dp_dma, p_sz, DMA_TO_DEVICE);
 	dma_unmap_single(dev, pdb->dq_dma, q_sz, DMA_TO_DEVICE);
 	dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
-	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_TO_DEVICE);
-	dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
+	dma_unmap_single(dev, pdb->tmp2_dma, q_sz, DMA_BIDIRECTIONAL);
 }
 
 /* RSA Job Completion handler */
@@ -417,13 +417,13 @@ static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
 		goto unmap_p;
 	}
 
-	pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_TO_DEVICE);
+	pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 	if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 		dev_err(dev, "Unable to map RSA tmp1 memory\n");
 		goto unmap_q;
 	}
 
-	pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_TO_DEVICE);
+	pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 	if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 		dev_err(dev, "Unable to map RSA tmp2 memory\n");
 		goto unmap_tmp1;
@@ -451,7 +451,7 @@ static int set_rsa_priv_f2_pdb(struct akcipher_request *req,
 	return 0;
 
 unmap_tmp1:
-	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 unmap_q:
 	dma_unmap_single(dev, pdb->q_dma, q_sz, DMA_TO_DEVICE);
 unmap_p:
@@ -504,13 +504,13 @@ static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
 		goto unmap_dq;
 	}
 
-	pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_TO_DEVICE);
+	pdb->tmp1_dma = dma_map_single(dev, key->tmp1, p_sz, DMA_BIDIRECTIONAL);
 	if (dma_mapping_error(dev, pdb->tmp1_dma)) {
 		dev_err(dev, "Unable to map RSA tmp1 memory\n");
 		goto unmap_qinv;
 	}
 
-	pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_TO_DEVICE);
+	pdb->tmp2_dma = dma_map_single(dev, key->tmp2, q_sz, DMA_BIDIRECTIONAL);
 	if (dma_mapping_error(dev, pdb->tmp2_dma)) {
 		dev_err(dev, "Unable to map RSA tmp2 memory\n");
 		goto unmap_tmp1;
@@ -538,7 +538,7 @@ static int set_rsa_priv_f3_pdb(struct akcipher_request *req,
 	return 0;
 
 unmap_tmp1:
-	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_TO_DEVICE);
+	dma_unmap_single(dev, pdb->tmp1_dma, p_sz, DMA_BIDIRECTIONAL);
 unmap_qinv:
 	dma_unmap_single(dev, pdb->c_dma, p_sz, DMA_TO_DEVICE);
 unmap_dq: