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>

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);