linux-kernel - [PATCH 1/2] uio: fsl_elbc_gpcm: Convert to platform remove callback returning void

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Message-ID:  <ca99d4e71054e8452f3cee6c016bf4f89bfc7eaa.1709933231.git.u.kleine-koenig@pengutronix.de>
Date: Fri,  8 Mar 2024 22:31:01 +0100
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org,
	kernel@...gutronix.de
Subject: [PATCH 1/2] uio: fsl_elbc_gpcm: Convert to platform remove callback returning void

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/uio/uio_fsl_elbc_gpcm.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/uio/uio_fsl_elbc_gpcm.c b/drivers/uio/uio_fsl_elbc_gpcm.c
index 82dda799f327..496caff66e7e 100644
--- a/drivers/uio/uio_fsl_elbc_gpcm.c
+++ b/drivers/uio/uio_fsl_elbc_gpcm.c
@@ -427,7 +427,7 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int uio_fsl_elbc_gpcm_remove(struct platform_device *pdev)
+static void uio_fsl_elbc_gpcm_remove(struct platform_device *pdev)
 {
 	struct uio_info *info = platform_get_drvdata(pdev);
 	struct fsl_elbc_gpcm *priv = info->priv;
@@ -438,8 +438,6 @@ static int uio_fsl_elbc_gpcm_remove(struct platform_device *pdev)
 		priv->shutdown(info, false);
 	iounmap(info->mem[0].internal_addr);
 
-	return 0;
-
 }
 
 static const struct of_device_id uio_fsl_elbc_gpcm_match[] = {
@@ -455,7 +453,7 @@ static struct platform_driver uio_fsl_elbc_gpcm_driver = {
 		.dev_groups = uio_fsl_elbc_gpcm_groups,
 	},
 	.probe = uio_fsl_elbc_gpcm_probe,
-	.remove = uio_fsl_elbc_gpcm_remove,
+	.remove_new = uio_fsl_elbc_gpcm_remove,
 };
 module_platform_driver(uio_fsl_elbc_gpcm_driver);
 
-- 
2.43.0