lkml.org 
[lkml]   [2024]   [Apr]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 2/3] drm/msm/mdp4: don't destroy mdp4_kms in mdp4_kms_init error path
From


On 4/19/2024 7:33 PM, Dmitry Baryshkov wrote:
> Since commit 3c74682637e6 ("drm/msm/mdp4: move resource allocation to
> the _probe function") the mdp4_kms data is allocated during probe. It is
> an error to destroy it during mdp4_kms_init(), as the data is still
> referenced by the drivers's data and can be used later in case of probe
> deferral.
>

mdp4_destroy() currently detaches mmu, calls msm_kms_destroy() which
destroys pending timers and releases refcount on the aspace.

It does not touch the mdp4_kms as that one is devm managed.

In the comment
https://patchwork.freedesktop.org/patch/590411/?series=132664&rev=1#comment_1074306,
we had discussed that the last component's reprobe attempt is affected
(which is not dpu or mdp4 or mdp5 right? )

If it was an interface (such as DSI OR DP), is it the aspace detach
which is causing the crash?

Another note is, mdp5 needs the same fix in that case.

dpu_kms_init() looks fine.

> Fixes: 3c74682637e6 ("drm/msm/mdp4: move resource allocation to the _probe function")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
> drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c | 28 +++++++++-------------------
> 1 file changed, 9 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
> index 4ba1cb74ad76..4c5f72b7e0e5 100644
> --- a/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
> +++ b/drivers/gpu/drm/msm/disp/mdp4/mdp4_kms.c
> @@ -392,7 +392,7 @@ static int mdp4_kms_init(struct drm_device *dev)
> ret = mdp_kms_init(&mdp4_kms->base, &kms_funcs);
> if (ret) {
> DRM_DEV_ERROR(dev->dev, "failed to init kms\n");
> - goto fail;
> + return ret;
> }
>
> kms = priv->kms;
> @@ -403,7 +403,7 @@ static int mdp4_kms_init(struct drm_device *dev)
> ret = regulator_enable(mdp4_kms->vdd);
> if (ret) {
> DRM_DEV_ERROR(dev->dev, "failed to enable regulator vdd: %d\n", ret);
> - goto fail;
> + return ret;
> }
> }
>
> @@ -414,8 +414,7 @@ static int mdp4_kms_init(struct drm_device *dev)
> if (major != 4) {
> DRM_DEV_ERROR(dev->dev, "unexpected MDP version: v%d.%d\n",
> major, minor);
> - ret = -ENXIO;
> - goto fail;
> + return -ENXIO;
> }
>
> mdp4_kms->rev = minor;
> @@ -423,8 +422,7 @@ static int mdp4_kms_init(struct drm_device *dev)
> if (mdp4_kms->rev >= 2) {
> if (!mdp4_kms->lut_clk) {
> DRM_DEV_ERROR(dev->dev, "failed to get lut_clk\n");
> - ret = -ENODEV;
> - goto fail;
> + return -ENODEV;
> }
> clk_set_rate(mdp4_kms->lut_clk, max_clk);
> }
> @@ -445,8 +443,7 @@ static int mdp4_kms_init(struct drm_device *dev)
>
> mmu = msm_iommu_new(&pdev->dev, 0);
> if (IS_ERR(mmu)) {
> - ret = PTR_ERR(mmu);
> - goto fail;
> + return PTR_ERR(mmu);
> } else if (!mmu) {
> DRM_DEV_INFO(dev->dev, "no iommu, fallback to phys "
> "contig buffers for scanout\n");
> @@ -458,8 +455,7 @@ static int mdp4_kms_init(struct drm_device *dev)
> if (IS_ERR(aspace)) {
> if (!IS_ERR(mmu))
> mmu->funcs->destroy(mmu);
> - ret = PTR_ERR(aspace);
> - goto fail;
> + return PTR_ERR(aspace);
> }
>
> kms->aspace = aspace;
> @@ -468,7 +464,7 @@ static int mdp4_kms_init(struct drm_device *dev)
> ret = modeset_init(mdp4_kms);
> if (ret) {
> DRM_DEV_ERROR(dev->dev, "modeset_init failed: %d\n", ret);
> - goto fail;
> + return ret;
> }
>
> mdp4_kms->blank_cursor_bo = msm_gem_new(dev, SZ_16K, MSM_BO_WC | MSM_BO_SCANOUT);
> @@ -476,14 +472,14 @@ static int mdp4_kms_init(struct drm_device *dev)
> ret = PTR_ERR(mdp4_kms->blank_cursor_bo);
> DRM_DEV_ERROR(dev->dev, "could not allocate blank-cursor bo: %d\n", ret);
> mdp4_kms->blank_cursor_bo = NULL;
> - goto fail;
> + return ret;
> }
>
> ret = msm_gem_get_and_pin_iova(mdp4_kms->blank_cursor_bo, kms->aspace,
> &mdp4_kms->blank_cursor_iova);
> if (ret) {
> DRM_DEV_ERROR(dev->dev, "could not pin blank-cursor bo: %d\n", ret);
> - goto fail;
> + return ret;
> }
>
> dev->mode_config.min_width = 0;
> @@ -492,12 +488,6 @@ static int mdp4_kms_init(struct drm_device *dev)
> dev->mode_config.max_height = 2048;
>
> return 0;
> -
> -fail:
> - if (kms)
> - mdp4_destroy(kms);
> -
> - return ret;
> }
>
> static const struct dev_pm_ops mdp4_pm_ops = {
>

\
 
 \ /
  Last update: 2024-05-27 17:56    [W:0.020 / U:0.072 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site