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UPSTREAM: drm/tegra: sor: Do not leak runtime PM reference

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It's theoretically possible for the runtime PM reference to leak if the
code fails anywhere between the pm_runtime_resume_and_get() and
pm_runtime_put() calls, so make sure to release the runtime PM reference
in that case.

Practically this will never happen because none of the functions will
fail on Tegra, but it's better for the code to be pedantic in case these
assumptions will ever become wrong.

Change-Id: I04d11da45f88ccbae5b007e73344232914480f77
Signed-off-by: Pavel Machek (CIP) <pavel@denx.de>
[treding@nvidia.com: add commit message]
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/+/2545947
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:
Pavel Machek (CIP)
2021-04-06 13:54:14 +02:00
committed by Laxman Dewangan
parent b66f51710d
commit a2c744d2a2
1 changed files with 10 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/gpu/drm/tegra/sor.c
View File

@@ -3121,21 +3121,21 @@ static int tegra_sor_init(struct host1x_client *client)
if (err < 0) {
dev_err(sor->dev, "failed to acquire SOR reset: %d\n",
err);
return err;
goto rpm_put;
}
err = reset_control_assert(sor->rst);
if (err < 0) {
dev_err(sor->dev, "failed to assert SOR reset: %d\n",
err);
return err;
goto rpm_put;
}
}
err = clk_prepare_enable(sor->clk);
if (err < 0) {
dev_err(sor->dev, "failed to enable clock: %d\n", err);
return err;
goto rpm_put;
}
usleep_range(1000, 3000);
@@ -3146,7 +3146,7 @@ static int tegra_sor_init(struct host1x_client *client)
dev_err(sor->dev, "failed to deassert SOR reset: %d\n",
err);
clk_disable_unprepare(sor->clk);
return err;
goto rpm_put;
}
reset_control_release(sor->rst);
@@ -3167,6 +3167,12 @@ static int tegra_sor_init(struct host1x_client *client)
}
return 0;
rpm_put:
if (sor->rst)
pm_runtime_put(sor->dev);
return err;
}
static int tegra_sor_exit(struct host1x_client *client)