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UPSTREAM: drm/tegra: sor: Fix AUX device reference leak

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In the case where the AUX provides an I2C-over-AUX DDC channel, a
reference is taken on the AUX parent device of the DDC channel rather
than the DDC channel like it would be for regular I2C controllers. To
make sure the correct reference is dropped, move the unreferencing code
into the SOR driver and make sure not to drop the I2C adapter reference
in that case.

Change-Id: I8821ffa49629f808714dae30463d7bf4a3466415
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2545951
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Thierry Reding
2021-05-27 20:09:08 +02:00
committed by Laxman Dewangan
parent 7cd5671ce4
commit 6e8e2ead9c
2 changed files with 20 additions and 14 deletions
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29
drivers/gpu/drm/tegra/sor.c
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@@ -3741,12 +3741,8 @@ static int tegra_sor_probe(struct platform_device *pdev)
if (!sor->aux)
return -EPROBE_DEFER;
if (get_device(sor->aux->dev)) {
if (try_module_get(sor->aux->dev->driver->owner))
sor->output.ddc = &sor->aux->ddc;
else
put_device(sor->aux->dev);
}
if (get_device(sor->aux->dev))
sor->output.ddc = &sor->aux->ddc;
}
if (!sor->aux) {
@@ -3774,12 +3770,13 @@ static int tegra_sor_probe(struct platform_device *pdev)
err = tegra_sor_parse_dt(sor);
if (err < 0)
return err;
goto put_aux;
err = tegra_output_probe(&sor->output);
if (err < 0)
return dev_err_probe(&pdev->dev, err,
"failed to probe output\n");
if (err < 0) {
dev_err_probe(&pdev->dev, err, "failed to probe output\n");
goto put_aux;
}
if (sor->ops && sor->ops->probe) {
err = sor->ops->probe(sor);
@@ -3966,7 +3963,14 @@ uninit:
host1x_client_exit(&sor->client);
pm_runtime_disable(&pdev->dev);
remove:
if (sor->aux)
sor->output.ddc = NULL;
tegra_output_remove(&sor->output);
put_aux:
if (sor->aux)
put_device(sor->aux->dev);
return err;
}
@@ -3984,6 +3988,11 @@ static int tegra_sor_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
if (sor->aux) {
put_device(sor->aux->dev);
sor->output.ddc = NULL;
}
tegra_output_remove(&sor->output);
return 0;