[media] s5p-mfc: Fix initialization of internal structures

Initialize members of the internal device and context structures as early
as possible to avoid access to uninitialized objects on initialization
failures. If loading firmware or creating of the hardware instance fails,
driver will access device or context queue in error handling path, which
might not be initialized yet, what causes kernel panic. Fix this by moving
initialization of all static members as early as possible.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc.c b/drivers/media/platform/s5p-mfc/s5p_mfc.c
index bb0a588..05fe82b 100644 (file)
--- a/drivers/media/platform/s5p-mfc/s5p_mfc.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc.c
@@ -764,6 +764,7 @@ static int s5p_mfc_open(struct file *file)
                ret = -ENOMEM;
                goto err_alloc;
        }
+       init_waitqueue_head(&ctx->queue);
        v4l2_fh_init(&ctx->fh, vdev);
        file->private_data = &ctx->fh;
        v4l2_fh_add(&ctx->fh);
@@ -899,7 +900,6 @@ static int s5p_mfc_open(struct file *file)
                mfc_err("Failed to initialize videobuf2 queue(output)\n");
                goto err_queue_init;
        }
-       init_waitqueue_head(&ctx->queue);
        mutex_unlock(&dev->mfc_mutex);
        mfc_debug_leave();
        return ret;
@@ -1218,6 +1218,13 @@ static int s5p_mfc_probe(struct platform_device *pdev)
        vb2_dma_contig_set_max_seg_size(dev->mem_dev_r, DMA_BIT_MASK(32));
 
        mutex_init(&dev->mfc_mutex);
+       init_waitqueue_head(&dev->queue);
+       dev->hw_lock = 0;
+       INIT_WORK(&dev->watchdog_work, s5p_mfc_watchdog_worker);
+       atomic_set(&dev->watchdog_cnt, 0);
+       init_timer(&dev->watchdog_timer);
+       dev->watchdog_timer.data = (unsigned long)dev;
+       dev->watchdog_timer.function = s5p_mfc_watchdog;
 
        ret = s5p_mfc_alloc_firmware(dev);
        if (ret)
@@ -1226,7 +1233,6 @@ static int s5p_mfc_probe(struct platform_device *pdev)
        ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
        if (ret)
                goto err_v4l2_dev_reg;
-       init_waitqueue_head(&dev->queue);
 
        /* decoder */
        vfd = video_device_alloc();
@@ -1263,13 +1269,6 @@ static int s5p_mfc_probe(struct platform_device *pdev)
        video_set_drvdata(vfd, dev);
        platform_set_drvdata(pdev, dev);
 
-       dev->hw_lock = 0;
-       INIT_WORK(&dev->watchdog_work, s5p_mfc_watchdog_worker);
-       atomic_set(&dev->watchdog_cnt, 0);
-       init_timer(&dev->watchdog_timer);
-       dev->watchdog_timer.data = (unsigned long)dev;
-       dev->watchdog_timer.function = s5p_mfc_watchdog;
-
        /* Initialize HW ops and commands based on MFC version */
        s5p_mfc_init_hw_ops(dev);
        s5p_mfc_init_hw_cmds(dev);