linux-kernel - [PATCH v2 3/3] media: staging: tegra-vde: Reorder misc device registration

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Date:   Mon, 15 Nov 2021 01:47:32 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Anton Bambura <jenneron@...tonmail.com>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] media: staging: tegra-vde: Reorder misc device registration

Register misc device in the end of driver's probing since device should
become visible to userspace once driver is fully prepared. Do the opposite
in case of driver removal. This is a minor improvement that doesn't solve
any problem, but makes code more consistent.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/staging/media/tegra-vde/vde.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/media/tegra-vde/vde.c b/drivers/staging/media/tegra-vde/vde.c
index f4f65eb78d44..a8f1a024c343 100644
--- a/drivers/staging/media/tegra-vde/vde.c
+++ b/drivers/staging/media/tegra-vde/vde.c
@@ -1193,12 +1193,6 @@ static int tegra_vde_probe(struct platform_device *pdev)
 		goto err_gen_free;
 	}
 
-	err = misc_register(&vde->miscdev);
-	if (err) {
-		dev_err(dev, "Failed to register misc device: %d\n", err);
-		goto err_deinit_iommu;
-	}
-
 	pm_runtime_enable(dev);
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, 300);
@@ -1220,15 +1214,20 @@ static int tegra_vde_probe(struct platform_device *pdev)
 		goto err_pm_runtime;
 	}
 
+	err = misc_register(&vde->miscdev);
+	if (err) {
+		dev_err(dev, "Failed to register misc device: %d\n", err);
+		goto err_free_secure_bo;
+	}
+
 	return 0;
 
+err_free_secure_bo:
+	tegra_vde_free_bo(vde->secure_bo);
 err_pm_runtime:
-	misc_deregister(&vde->miscdev);
-
 	pm_runtime_dont_use_autosuspend(dev);
 	pm_runtime_disable(dev);
 
-err_deinit_iommu:
 	tegra_vde_iommu_deinit(vde);
 
 err_gen_free:
@@ -1243,6 +1242,8 @@ static int tegra_vde_remove(struct platform_device *pdev)
 	struct tegra_vde *vde = platform_get_drvdata(pdev);
 	struct device *dev = &pdev->dev;
 
+	misc_deregister(&vde->miscdev);
+
 	tegra_vde_free_bo(vde->secure_bo);
 
 	/*
@@ -1261,8 +1262,6 @@ static int tegra_vde_remove(struct platform_device *pdev)
 	pm_runtime_put_noidle(dev);
 	clk_disable_unprepare(vde->clk);
 
-	misc_deregister(&vde->miscdev);
-
 	tegra_vde_dmabuf_cache_unmap_all(vde);
 	tegra_vde_iommu_deinit(vde);
 
-- 
2.33.1