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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.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2021-05-27 20:09:08 +02:00
parent 1d15a10395
commit b79b6081c4
2 changed files with 20 additions and 14 deletions
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5
drivers/gpu/drm/tegra/output.c
View file

@ -180,13 +180,10 @@ int tegra_output_probe(struct tegra_output *output)
void tegra_output_remove(struct tegra_output *output)
{
int connector_type = output->connector.connector_type;
if (output->hpd_gpio)
free_irq(output->hpd_irq, output);
if (connector_type != DRM_MODE_CONNECTOR_eDP &&
connector_type != DRM_MODE_CONNECTOR_DisplayPort && output->ddc)
if (output->ddc)
i2c_put_adapter(output->ddc);
}

29
drivers/gpu/drm/tegra/sor.c
View file

@ -3745,12 +3745,8 @@ 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) {
@ -3778,12 +3774,13 @@ 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);
@ -3970,7 +3967,14 @@ static int tegra_sor_probe(struct platform_device *pdev)
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;
}
@ -3988,6 +3992,11 @@ 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;