crypto: qce - convert qce_dma_request() to use devres

Make qce_dma_request() into a managed interface. With this we can
simplify the error path in probe() and drop another operations from
remove().

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

3 files changed, 17 insertions, 24 deletions

diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
index cdcddf8f9f02..e2cda24960f6 100644
--- a/drivers/crypto/qce/core.c
+++ b/drivers/crypto/qce/core.c
@@ -232,13 +232,13 @@ static int qce_crypto_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = qce_dma_request(qce->dev, &qce->dma);
+	ret = devm_qce_dma_request(qce->dev, &qce->dma);
 	if (ret)
 		return ret;
 
 	ret = qce_check_version(qce);
 	if (ret)
-		goto err_dma;
+		return ret;
 
 	spin_lock_init(&qce->lock);
 	tasklet_init(&qce->done_tasklet, qce_tasklet_req_done,
@@ -248,16 +248,7 @@ static int qce_crypto_probe(struct platform_device *pdev)
 	qce->async_req_enqueue = qce_async_request_enqueue;
 	qce->async_req_done = qce_async_request_done;
 
-	ret = qce_register_algs(qce);
-	if (ret)
-		goto err_dma;
-
-	return 0;
-
-err_dma:
-	qce_dma_release(&qce->dma);
-
-	return ret;
+	return qce_register_algs(qce);
 }
 
 static void qce_crypto_remove(struct platform_device *pdev)
@@ -266,7 +257,6 @@ static void qce_crypto_remove(struct platform_device *pdev)
 
 	tasklet_kill(&qce->done_tasklet);
 	qce_unregister_algs(qce);
-	qce_dma_release(&qce->dma);
 }
 
 static const struct of_device_id qce_crypto_of_match[] = {
diff --git a/drivers/crypto/qce/dma.c b/drivers/crypto/qce/dma.c
index 46db5bf366b4..1dec7aea852d 100644
--- a/drivers/crypto/qce/dma.c
+++ b/drivers/crypto/qce/dma.c
@@ -3,12 +3,22 @@
  * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
  */
 
+#include <linux/device.h>
 #include <linux/dmaengine.h>
 #include <crypto/scatterwalk.h>
 
 #include "dma.h"
 
-int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
+static void qce_dma_release(void *data)
+{
+	struct qce_dma_data *dma = data;
+
+	dma_release_channel(dma->txchan);
+	dma_release_channel(dma->rxchan);
+	kfree(dma->result_buf);
+}
+
+int devm_qce_dma_request(struct device *dev, struct qce_dma_data *dma)
 {
 	int ret;
 
@@ -31,7 +41,8 @@ int qce_dma_request(struct device *dev, struct qce_dma_data *dma)
 
 	dma->ignore_buf = dma->result_buf + QCE_RESULT_BUF_SZ;
 
-	return 0;
+	return devm_add_action_or_reset(dev, qce_dma_release, dma);
+
 error_nomem:
 	dma_release_channel(dma->rxchan);
 error_rx:
@@ -39,13 +50,6 @@ error_rx:
 	return ret;
 }
 
-void qce_dma_release(struct qce_dma_data *dma)
-{
-	dma_release_channel(dma->txchan);
-	dma_release_channel(dma->rxchan);
-	kfree(dma->result_buf);
-}
-
 struct scatterlist *
 qce_sgtable_add(struct sg_table *sgt, struct scatterlist *new_sgl,
 		unsigned int max_len)
diff --git a/drivers/crypto/qce/dma.h b/drivers/crypto/qce/dma.h
index 786402169360..31629185000e 100644
--- a/drivers/crypto/qce/dma.h
+++ b/drivers/crypto/qce/dma.h
@@ -34,8 +34,7 @@ struct qce_dma_data {
 	void *ignore_buf;
 };
 
-int qce_dma_request(struct device *dev, struct qce_dma_data *dma);
-void qce_dma_release(struct qce_dma_data *dma);
+int devm_qce_dma_request(struct device *dev, struct qce_dma_data *dma);
 int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *sg_in,
 		     int in_ents, struct scatterlist *sg_out, int out_ents,
 		     dma_async_tx_callback cb, void *cb_param);