drm/tilcdc: Fix the error path in tilcdc_load()
The current error path calls tilcdc_unload() in case of an error to release the resources. However, this is wrong because not all resources have been allocated by the time an error occurs in tilcdc_load(). To fix it, this commit adds proper labels to bail out at the different stages in the load function, and release only the resources actually allocated. Tested-by: Darren Etheridge <detheridge@ti.com> Tested-by: Johannes Pointner <johannes.pointner@br-automation.com> Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Dave Airlie <airlied@redhat.com>
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40d201af0b
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@ -84,6 +84,7 @@ static int modeset_init(struct drm_device *dev)
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if ((priv->num_encoders == 0) || (priv->num_connectors == 0)) {
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/* oh nos! */
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dev_err(dev->dev, "no encoders/connectors found\n");
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drm_mode_config_cleanup(dev);
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return -ENXIO;
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}
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@ -172,33 +173,37 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
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dev->dev_private = priv;
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priv->wq = alloc_ordered_workqueue("tilcdc", 0);
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if (!priv->wq) {
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ret = -ENOMEM;
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goto fail_free_priv;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev->dev, "failed to get memory resource\n");
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ret = -EINVAL;
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goto fail;
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goto fail_free_wq;
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}
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priv->mmio = ioremap_nocache(res->start, resource_size(res));
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if (!priv->mmio) {
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dev_err(dev->dev, "failed to ioremap\n");
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ret = -ENOMEM;
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goto fail;
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goto fail_free_wq;
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}
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priv->clk = clk_get(dev->dev, "fck");
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if (IS_ERR(priv->clk)) {
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dev_err(dev->dev, "failed to get functional clock\n");
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ret = -ENODEV;
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goto fail;
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goto fail_iounmap;
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}
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priv->disp_clk = clk_get(dev->dev, "dpll_disp_ck");
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if (IS_ERR(priv->clk)) {
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dev_err(dev->dev, "failed to get display clock\n");
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ret = -ENODEV;
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goto fail;
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goto fail_put_clk;
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}
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#ifdef CONFIG_CPU_FREQ
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@ -208,7 +213,7 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
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CPUFREQ_TRANSITION_NOTIFIER);
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if (ret) {
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dev_err(dev->dev, "failed to register cpufreq notifier\n");
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goto fail;
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goto fail_put_disp_clk;
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}
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#endif
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@ -253,13 +258,13 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
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ret = modeset_init(dev);
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if (ret < 0) {
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dev_err(dev->dev, "failed to initialize mode setting\n");
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goto fail;
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goto fail_cpufreq_unregister;
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}
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ret = drm_vblank_init(dev, 1);
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if (ret < 0) {
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dev_err(dev->dev, "failed to initialize vblank\n");
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goto fail;
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goto fail_mode_config_cleanup;
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}
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pm_runtime_get_sync(dev->dev);
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@ -267,7 +272,7 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
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pm_runtime_put_sync(dev->dev);
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if (ret < 0) {
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dev_err(dev->dev, "failed to install IRQ handler\n");
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goto fail;
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goto fail_vblank_cleanup;
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}
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platform_set_drvdata(pdev, dev);
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@ -283,13 +288,48 @@ static int tilcdc_load(struct drm_device *dev, unsigned long flags)
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priv->fbdev = drm_fbdev_cma_init(dev, bpp,
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dev->mode_config.num_crtc,
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dev->mode_config.num_connector);
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if (IS_ERR(priv->fbdev)) {
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ret = PTR_ERR(priv->fbdev);
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goto fail_irq_uninstall;
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}
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drm_kms_helper_poll_init(dev);
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return 0;
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fail:
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tilcdc_unload(dev);
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fail_irq_uninstall:
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pm_runtime_get_sync(dev->dev);
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drm_irq_uninstall(dev);
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pm_runtime_put_sync(dev->dev);
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fail_vblank_cleanup:
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drm_vblank_cleanup(dev);
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fail_mode_config_cleanup:
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drm_mode_config_cleanup(dev);
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fail_cpufreq_unregister:
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pm_runtime_disable(dev->dev);
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#ifdef CONFIG_CPU_FREQ
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cpufreq_unregister_notifier(&priv->freq_transition,
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CPUFREQ_TRANSITION_NOTIFIER);
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fail_put_disp_clk:
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clk_put(priv->disp_clk);
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#endif
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fail_put_clk:
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clk_put(priv->clk);
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fail_iounmap:
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iounmap(priv->mmio);
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fail_free_wq:
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flush_workqueue(priv->wq);
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destroy_workqueue(priv->wq);
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fail_free_priv:
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dev->dev_private = NULL;
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kfree(priv);
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return ret;
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}
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