reset: sunxi: fix spinlock initialization

Call spin_lock_init() before the spinlocks are used, both in early init
and probe functions preventing a lockdep splat.

I have been observing lockdep complaining [1] during boot on my a80 optimus [2]
when CONFIG_PROVE_LOCKING has been enabled. This patch resolves the splat,
and has been tested on a few other sunxi platforms without issue.

[1] http://storage.kernelci.org/next/next-20150107/arm-multi_v7_defconfig+CONFIG_PROVE_LOCKING=y/lab-tbaker/boot-sun9i-a80-optimus.html
[2] http://kernelci.org/boot/?a80-optimus

Signed-off-by: Tyler Baker <tyler.baker@linaro.org>
Cc: <stable@vger.kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/drivers/reset/reset-sunxi.c b/drivers/reset/reset-sunxi.c
index eebc52c..3d95c87 100644 (file)
--- a/drivers/reset/reset-sunxi.c
+++ b/drivers/reset/reset-sunxi.c
@@ -102,6 +102,8 @@ static int sunxi_reset_init(struct device_node *np)
                goto err_alloc;
        }
 
+       spin_lock_init(&data->lock);
+
        data->rcdev.owner = THIS_MODULE;
        data->rcdev.nr_resets = size * 32;
        data->rcdev.ops = &sunxi_reset_ops;
@@ -157,6 +159,8 @@ static int sunxi_reset_probe(struct platform_device *pdev)
        if (IS_ERR(data->membase))
                return PTR_ERR(data->membase);
 
+       spin_lock_init(&data->lock);
+
        data->rcdev.owner = THIS_MODULE;
        data->rcdev.nr_resets = resource_size(res) * 32;
        data->rcdev.ops = &sunxi_reset_ops;