[PATCH] crypto: atmel-aes - remove calls of clk_prepare() from atomic contexts

[Cyrille Pitchen]

clk_prepare()/clk_unprepare() must not be called within atomic context.

This patch calls clk_prepare() once for all from atmel_aes_probe() and
clk_unprepare() from atmel_aes_remove().

Then calls of clk_prepare_enable()/clk_disable_unprepare() were replaced
by calls of clk_enable()/clk_disable().

Signed-off-by: Cyrille Pitchen <cyrille.pitc...@atmel.com>
Reported-by: Matthias Mayr <matthias.m...@student.kit.edu>
---
 drivers/crypto/atmel-aes.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/atmel-aes.c b/drivers/crypto/atmel-aes.c
index 6dd3317ca365..3eb3f1279fb7 100644
--- a/drivers/crypto/atmel-aes.c
+++ b/drivers/crypto/atmel-aes.c
@@ -400,7 +400,7 @@ static int atmel_aes_hw_init(struct atmel_aes_dev *dd)
 {
        int err;
 
-       err = clk_prepare_enable(dd->iclk);
+       err = clk_enable(dd->iclk);
        if (err)
                return err;
 
@@ -430,7 +430,7 @@ static int atmel_aes_hw_version_init(struct atmel_aes_dev 
*dd)
 
        dev_info(dd->dev, "version: 0x%x\n", dd->hw_version);
 
-       clk_disable_unprepare(dd->iclk);
+       clk_disable(dd->iclk);
        return 0;
 }
 
@@ -448,7 +448,7 @@ static inline bool atmel_aes_is_encrypt(const struct 
atmel_aes_dev *dd)
 
 static inline int atmel_aes_complete(struct atmel_aes_dev *dd, int err)
 {
-       clk_disable_unprepare(dd->iclk);
+       clk_disable(dd->iclk);
        dd->flags &= ~AES_FLAGS_BUSY;
 
        if (dd->is_async)
@@ -2091,10 +2091,14 @@ static int atmel_aes_probe(struct platform_device *pdev)
                goto res_err;
        }
 
-       err = atmel_aes_hw_version_init(aes_dd);
+       err = clk_prepare(aes_dd->iclk);
        if (err)
                goto res_err;
 
+       err = atmel_aes_hw_version_init(aes_dd);
+       if (err)
+               goto iclk_unprepare;
+
        atmel_aes_get_cap(aes_dd);
 
        err = atmel_aes_buff_init(aes_dd);
@@ -2127,6 +2131,8 @@ err_algs:
 err_aes_dma:
        atmel_aes_buff_cleanup(aes_dd);
 err_aes_buff:
+iclk_unprepare:
+       clk_unprepare(aes_dd->iclk);
 res_err:
        tasklet_kill(&aes_dd->done_task);
        tasklet_kill(&aes_dd->queue_task);
@@ -2155,6 +2161,8 @@ static int atmel_aes_remove(struct platform_device *pdev)
        atmel_aes_dma_cleanup(aes_dd);
        atmel_aes_buff_cleanup(aes_dd);
 
+       clk_unprepare(aes_dd->iclk);
+
        return 0;
 }
 
-- 
1.8.2.2

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