[media] exynos-gsc: Correct the clock handling

Make sure there is no unbalanced clk_unprepare call and add missing
clock release in the driver's remove() callback.

Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
index 45bcfa7..c8b82c0 100644 (file)
--- a/drivers/media/platform/exynos-gsc/gsc-core.c
+++ b/drivers/media/platform/exynos-gsc/gsc-core.c
@@ -1002,12 +1002,11 @@ static void *gsc_get_drv_data(struct platform_device *pdev)
 
 static void gsc_clk_put(struct gsc_dev *gsc)
 {
-       if (IS_ERR_OR_NULL(gsc->clock))
-               return;
-
-       clk_unprepare(gsc->clock);
-       clk_put(gsc->clock);
-       gsc->clock = NULL;
+       if (!IS_ERR(gsc->clock)) {
+               clk_unprepare(gsc->clock);
+               clk_put(gsc->clock);
+               gsc->clock = NULL;
+       }
 }
 
 static int gsc_clk_get(struct gsc_dev *gsc)
@@ -1028,7 +1027,7 @@ static int gsc_clk_get(struct gsc_dev *gsc)
                dev_err(&gsc->pdev->dev, "clock prepare failed for clock: %s\n",
                        GSC_CLOCK_GATE_NAME);
                clk_put(gsc->clock);
-               gsc->clock = NULL;
+               gsc->clock = ERR_PTR(-EINVAL);
                goto err_clk_prepare;
        }
 
@@ -1106,6 +1105,7 @@ static int gsc_probe(struct platform_device *pdev)
        init_waitqueue_head(&gsc->irq_queue);
        spin_lock_init(&gsc->slock);
        mutex_init(&gsc->lock);
+       gsc->clock = ERR_PTR(-EINVAL);
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        gsc->regs = devm_request_and_ioremap(dev, res);
@@ -1169,6 +1169,7 @@ static int __devexit gsc_remove(struct platform_device *pdev)
 
        vb2_dma_contig_cleanup_ctx(gsc->alloc_ctx);
        pm_runtime_disable(&pdev->dev);
+       gsc_clk_put(gsc);
 
        dev_dbg(&pdev->dev, "%s driver unloaded\n", pdev->name);
        return 0;