crypto: ux500/hash - Prepare clock before enabling it

If we fail to prepare the ux500-hash clock before enabling it the
platform will fail to boot. Here we insure this happens.

Cc: David S. Miller <davem@davemloft.net>
Cc: Andreas Westin <andreas.westin@stericsson.com>
Cc: linux-crypto@vger.kernel.org
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/crypto/ux500/hash/hash_core.c b/drivers/crypto/ux500/hash/hash_core.c
index cf55089..4b02428 100644 (file)
--- a/drivers/crypto/ux500/hash/hash_core.c
+++ b/drivers/crypto/ux500/hash/hash_core.c
@@ -1726,11 +1726,17 @@ static int ux500_hash_probe(struct platform_device *pdev)
                goto out_regulator;
        }
 
+       ret = clk_prepare(device_data->clk);
+       if (ret) {
+               dev_err(dev, "[%s] clk_prepare() failed!", __func__);
+               goto out_clk;
+       }
+
        /* Enable device power (and clock) */
        ret = hash_enable_power(device_data, false);
        if (ret) {
                dev_err(dev, "[%s]: hash_enable_power() failed!", __func__);
-               goto out_clk;
+               goto out_clk_unprepare;
        }
 
        ret = hash_check_hw(device_data);
@@ -1762,6 +1768,9 @@ static int ux500_hash_probe(struct platform_device *pdev)
 out_power:
        hash_disable_power(device_data, false);
 
+out_clk_unprepare:
+       clk_unprepare(device_data->clk);
+
 out_clk:
        clk_put(device_data->clk);
 
@@ -1826,6 +1835,7 @@ static int ux500_hash_remove(struct platform_device *pdev)
                dev_err(dev, "[%s]: hash_disable_power() failed",
                        __func__);
 
+       clk_unprepare(device_data->clk);
        clk_put(device_data->clk);
        regulator_put(device_data->regulator);