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platform: tegra: bwmgr: Improve resource management to avoid leak

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The previous implementation doesn't release the resource in a few
cases, which can lead to leakage. Improving error handling and resource
cleanup when the driver is removed.

Bug 5483386

Change-Id: I316879075808ea945ebac997728aa51ff8b69488
Signed-off-by: robelin <robelin@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3474021
Reviewed-by: Johnny Liu <johnliu@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
This commit is contained in:
robelin
2025-10-21 19:15:13 +08:00
committed by mobile promotions
parent 9831027796
commit 7f93fd77a5
1 changed files with 35 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
drivers/platform/tegra/tegra-bpmp-bwmgr.c
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@@ -189,8 +189,8 @@ static int tegra_bpmp_bwmgr_devfreq_register(struct tegra_bpmp_bwmgr *bwmgr)
bwmgr->devfreq_profile,
DEVFREQ_GOV_BWMGR, NULL);
if (IS_ERR(bwmgr->devfreq)) {
dev_pm_opp_remove_all_dynamic(bwmgr->dev);
return PTR_ERR(bwmgr->devfreq);
ret = PTR_ERR(bwmgr->devfreq);
goto devfreq_add_dev_err;
}
if (!bwmgr->mrq_valid || !bwmgr->enabled) {
@@ -209,12 +209,16 @@ static int tegra_bpmp_bwmgr_devfreq_register(struct tegra_bpmp_bwmgr *bwmgr)
ret = dev_pm_qos_add_notifier(bwmgr->dev,
&bwmgr->max_freq_nb,
DEV_PM_QOS_MAX_FREQUENCY);
if (ret < 0) {
devm_devfreq_remove_device(bwmgr->dev, bwmgr->devfreq);
dev_pm_opp_remove_all_dynamic(bwmgr->dev);
return ret;
}
if (ret < 0)
goto devfreq_add_notifier_err;
return 0;
devfreq_add_notifier_err:
devm_devfreq_remove_device(bwmgr->dev, bwmgr->devfreq);
devfreq_add_dev_err:
dev_pm_opp_remove_all_dynamic(bwmgr->dev);
kfree(bwmgr->devfreq_profile);
return ret;
#else
return -EOPNOTSUPP;
@@ -229,6 +233,7 @@ static void tegra_bpmp_bwmgr_devfreq_unregister(struct tegra_bpmp_bwmgr *bwmgr)
DEV_PM_QOS_MAX_FREQUENCY);
devm_devfreq_remove_device(bwmgr->dev, bwmgr->devfreq);
dev_pm_opp_remove_all_dynamic(bwmgr->dev);
kfree(bwmgr->devfreq_profile);
#endif
}
@@ -245,12 +250,16 @@ static int tegra_bpmp_bwmgr_probe(struct platform_device *pdev)
return -ENOMEM;
bwmgr->clk = devm_clk_get(&pdev->dev, "emc");
if (IS_ERR(bwmgr->clk))
return PTR_ERR(bwmgr->clk);
if (IS_ERR(bwmgr->clk)) {
err = PTR_ERR(bwmgr->clk);
goto devm_clk_get_err;
}
bwmgr->bpmp = tegra_bpmp_get(&pdev->dev);
if (IS_ERR(bwmgr->bpmp))
return PTR_ERR(bwmgr->bpmp);
if (IS_ERR(bwmgr->bpmp)) {
err = PTR_ERR(bwmgr->bpmp);
goto bpmp_get_err;
}
bwmgr->mrq_valid = tegra_bpmp_mrq_is_supported(bwmgr->bpmp, MRQ_BWMGR_INT);
if (bwmgr->mrq_valid) {
@@ -285,16 +294,26 @@ static int tegra_bpmp_bwmgr_probe(struct platform_device *pdev)
dev_err(&pdev->dev,
"fail to register devfreq governor %s: %d\n",
DEVFREQ_GOV_BWMGR, err);
return err;
goto add_gov_err;
}
err = tegra_bpmp_bwmgr_devfreq_register(bwmgr);
if (err) {
dev_err(&pdev->dev, "fail to register devfreq device: %d\n", err);
return err;
goto devfreq_register_err;
}
return 0;
devfreq_register_err:
devfreq_remove_governor(&devfreq_gov_bwmgr);
add_gov_err:
tegra_bpmp_put(bwmgr->bpmp);
bpmp_get_err:
devm_clk_put(&pdev->dev, bwmgr->clk);
devm_clk_get_err:
kfree(bwmgr);
return err;
}
static int tegra_bpmp_bwmgr_remove(struct platform_device *pdev)
@@ -303,6 +322,9 @@ static int tegra_bpmp_bwmgr_remove(struct platform_device *pdev)
tegra_bpmp_bwmgr_devfreq_unregister(bwmgr);
devfreq_remove_governor(&devfreq_gov_bwmgr);
tegra_bpmp_put(bwmgr->bpmp);
devm_clk_put(&pdev->dev, bwmgr->clk);
kfree(bwmgr);
return 0;
}