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* [PATCH] scsi: ufs: Convert all platform drivers to return void
@ 2023-09-17 14:57 Uwe Kleine-König
  2023-09-17 20:08 ` Uwe Kleine-König
                   ` (3 more replies)
  0 siblings, 4 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2023-09-17 14:57 UTC (permalink / raw)
  To: James E.J. Bottomley, Martin K. Petersen, Pedro Sousa,
	Alim Akhtar
  Cc: linux-scsi, linux-arm-kernel, kernel

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() is renamed to .remove().

All platform drivers below drivers/ufs/ unconditionally return zero in
their remove callback and so can be converted trivially to the variant
returning void.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 drivers/ufs/host/cdns-pltfrm.c        | 5 ++---
 drivers/ufs/host/tc-dwc-g210-pltfrm.c | 6 ++----
 drivers/ufs/host/ti-j721e-ufs.c       | 6 ++----
 drivers/ufs/host/ufs-exynos.c         | 6 ++----
 drivers/ufs/host/ufs-hisi.c           | 5 ++---
 drivers/ufs/host/ufs-mediatek.c       | 5 ++---
 drivers/ufs/host/ufs-qcom.c           | 5 ++---
 drivers/ufs/host/ufs-renesas.c        | 6 ++----
 drivers/ufs/host/ufs-sprd.c           | 5 ++---
 9 files changed, 18 insertions(+), 31 deletions(-)

diff --git a/drivers/ufs/host/cdns-pltfrm.c b/drivers/ufs/host/cdns-pltfrm.c
index 2491e7e87028..bb30267da471 100644
--- a/drivers/ufs/host/cdns-pltfrm.c
+++ b/drivers/ufs/host/cdns-pltfrm.c
@@ -305,12 +305,11 @@ static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
  *
  * Return: 0 (success).
  */
-static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
+static void cdns_ufs_pltfrm_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
 	ufshcd_remove(hba);
-	return 0;
 }
 
 static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
@@ -322,7 +321,7 @@ static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {
 
 static struct platform_driver cdns_ufs_pltfrm_driver = {
 	.probe	= cdns_ufs_pltfrm_probe,
-	.remove	= cdns_ufs_pltfrm_remove,
+	.remove_new = cdns_ufs_pltfrm_remove,
 	.driver	= {
 		.name   = "cdns-ufshcd",
 		.pm     = &cdns_ufs_dev_pm_ops,
diff --git a/drivers/ufs/host/tc-dwc-g210-pltfrm.c b/drivers/ufs/host/tc-dwc-g210-pltfrm.c
index 4d5389dd9585..a3877592604d 100644
--- a/drivers/ufs/host/tc-dwc-g210-pltfrm.c
+++ b/drivers/ufs/host/tc-dwc-g210-pltfrm.c
@@ -74,14 +74,12 @@ static int tc_dwc_g210_pltfm_probe(struct platform_device *pdev)
  * @pdev: pointer to platform device structure
  *
  */
-static int tc_dwc_g210_pltfm_remove(struct platform_device *pdev)
+static void tc_dwc_g210_pltfm_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
-
-	return 0;
 }
 
 static const struct dev_pm_ops tc_dwc_g210_pltfm_pm_ops = {
@@ -91,7 +89,7 @@ static const struct dev_pm_ops tc_dwc_g210_pltfm_pm_ops = {
 
 static struct platform_driver tc_dwc_g210_pltfm_driver = {
 	.probe		= tc_dwc_g210_pltfm_probe,
-	.remove		= tc_dwc_g210_pltfm_remove,
+	.remove_new	= tc_dwc_g210_pltfm_remove,
 	.driver		= {
 		.name	= "tc-dwc-g210-pltfm",
 		.pm	= &tc_dwc_g210_pltfm_pm_ops,
diff --git a/drivers/ufs/host/ti-j721e-ufs.c b/drivers/ufs/host/ti-j721e-ufs.c
index 117eb7da92ac..250c22df000d 100644
--- a/drivers/ufs/host/ti-j721e-ufs.c
+++ b/drivers/ufs/host/ti-j721e-ufs.c
@@ -65,13 +65,11 @@ static int ti_j721e_ufs_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int ti_j721e_ufs_remove(struct platform_device *pdev)
+static void ti_j721e_ufs_remove(struct platform_device *pdev)
 {
 	of_platform_depopulate(&pdev->dev);
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-
-	return 0;
 }
 
 static const struct of_device_id ti_j721e_ufs_of_match[] = {
@@ -85,7 +83,7 @@ MODULE_DEVICE_TABLE(of, ti_j721e_ufs_of_match);
 
 static struct platform_driver ti_j721e_ufs_driver = {
 	.probe	= ti_j721e_ufs_probe,
-	.remove	= ti_j721e_ufs_remove,
+	.remove_new = ti_j721e_ufs_remove,
 	.driver	= {
 		.name   = "ti-j721e-ufs",
 		.of_match_table = ti_j721e_ufs_of_match,
diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 3396e0388512..3178efe0889e 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -1605,7 +1605,7 @@ static int exynos_ufs_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int exynos_ufs_remove(struct platform_device *pdev)
+static void exynos_ufs_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 	struct exynos_ufs *ufs = ufshcd_get_variant(hba);
@@ -1615,8 +1615,6 @@ static int exynos_ufs_remove(struct platform_device *pdev)
 
 	phy_power_off(ufs->phy);
 	phy_exit(ufs->phy);
-
-	return 0;
 }
 
 static struct exynos_ufs_uic_attr exynos7_uic_attr = {
@@ -1756,7 +1754,7 @@ static const struct dev_pm_ops exynos_ufs_pm_ops = {
 
 static struct platform_driver exynos_ufs_pltform = {
 	.probe	= exynos_ufs_probe,
-	.remove	= exynos_ufs_remove,
+	.remove_new = exynos_ufs_remove,
 	.driver	= {
 		.name	= "exynos-ufshc",
 		.pm	= &exynos_ufs_pm_ops,
diff --git a/drivers/ufs/host/ufs-hisi.c b/drivers/ufs/host/ufs-hisi.c
index 5b3060cd0ab8..0229ac0a8dbe 100644
--- a/drivers/ufs/host/ufs-hisi.c
+++ b/drivers/ufs/host/ufs-hisi.c
@@ -575,12 +575,11 @@ static int ufs_hisi_probe(struct platform_device *pdev)
 	return ufshcd_pltfrm_init(pdev, of_id->data);
 }
 
-static int ufs_hisi_remove(struct platform_device *pdev)
+static void ufs_hisi_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
 	ufshcd_remove(hba);
-	return 0;
 }
 
 static const struct dev_pm_ops ufs_hisi_pm_ops = {
@@ -592,7 +591,7 @@ static const struct dev_pm_ops ufs_hisi_pm_ops = {
 
 static struct platform_driver ufs_hisi_pltform = {
 	.probe	= ufs_hisi_probe,
-	.remove	= ufs_hisi_remove,
+	.remove_new = ufs_hisi_remove,
 	.driver	= {
 		.name	= "ufshcd-hisi",
 		.pm	= &ufs_hisi_pm_ops,
diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 941f58744d08..fc61790d289b 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1748,13 +1748,12 @@ static int ufs_mtk_probe(struct platform_device *pdev)
  *
  * Always return 0
  */
-static int ufs_mtk_remove(struct platform_device *pdev)
+static void ufs_mtk_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
-	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -1818,7 +1817,7 @@ static const struct dev_pm_ops ufs_mtk_pm_ops = {
 
 static struct platform_driver ufs_mtk_pltform = {
 	.probe      = ufs_mtk_probe,
-	.remove     = ufs_mtk_remove,
+	.remove_new = ufs_mtk_remove,
 	.driver = {
 		.name   = "ufshcd-mtk",
 		.pm     = &ufs_mtk_pm_ops,
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index a6078d5939ed..2128db0293b5 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -2031,14 +2031,13 @@ static int ufs_qcom_probe(struct platform_device *pdev)
  *
  * Always returns 0
  */
-static int ufs_qcom_remove(struct platform_device *pdev)
+static void ufs_qcom_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
 	platform_msi_domain_free_irqs(hba->dev);
-	return 0;
 }
 
 static const struct of_device_id ufs_qcom_of_match[] __maybe_unused = {
@@ -2070,7 +2069,7 @@ static const struct dev_pm_ops ufs_qcom_pm_ops = {
 
 static struct platform_driver ufs_qcom_pltform = {
 	.probe	= ufs_qcom_probe,
-	.remove	= ufs_qcom_remove,
+	.remove_new = ufs_qcom_remove,
 	.driver	= {
 		.name	= "ufshcd-qcom",
 		.pm	= &ufs_qcom_pm_ops,
diff --git a/drivers/ufs/host/ufs-renesas.c b/drivers/ufs/host/ufs-renesas.c
index cc94970b86c9..8711e5cbc968 100644
--- a/drivers/ufs/host/ufs-renesas.c
+++ b/drivers/ufs/host/ufs-renesas.c
@@ -388,18 +388,16 @@ static int ufs_renesas_probe(struct platform_device *pdev)
 	return ufshcd_pltfrm_init(pdev, &ufs_renesas_vops);
 }
 
-static int ufs_renesas_remove(struct platform_device *pdev)
+static void ufs_renesas_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba = platform_get_drvdata(pdev);
 
 	ufshcd_remove(hba);
-
-	return 0;
 }
 
 static struct platform_driver ufs_renesas_platform = {
 	.probe	= ufs_renesas_probe,
-	.remove	= ufs_renesas_remove,
+	.remove_new = ufs_renesas_remove,
 	.driver	= {
 		.name	= "ufshcd-renesas",
 		.of_match_table	= of_match_ptr(ufs_renesas_of_match),
diff --git a/drivers/ufs/host/ufs-sprd.c b/drivers/ufs/host/ufs-sprd.c
index 2bad75dd6d58..d8b165908809 100644
--- a/drivers/ufs/host/ufs-sprd.c
+++ b/drivers/ufs/host/ufs-sprd.c
@@ -425,13 +425,12 @@ static int ufs_sprd_probe(struct platform_device *pdev)
 	return err;
 }
 
-static int ufs_sprd_remove(struct platform_device *pdev)
+static void ufs_sprd_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
-	return 0;
 }
 
 static const struct dev_pm_ops ufs_sprd_pm_ops = {
@@ -443,7 +442,7 @@ static const struct dev_pm_ops ufs_sprd_pm_ops = {
 
 static struct platform_driver ufs_sprd_pltform = {
 	.probe = ufs_sprd_probe,
-	.remove = ufs_sprd_remove,
+	.remove_new = ufs_sprd_remove,
 	.driver = {
 		.name = "ufshcd-sprd",
 		.pm = &ufs_sprd_pm_ops,

base-commit: dfa449a58323de195773cf928d99db4130702bf7
-- 
2.40.1


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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [PATCH] scsi: ufs: Convert all platform drivers to return void
  2023-09-17 14:57 [PATCH] scsi: ufs: Convert all platform drivers to return void Uwe Kleine-König
@ 2023-09-17 20:08 ` Uwe Kleine-König
  2023-09-17 20:14 ` Bean Huo
                   ` (2 subsequent siblings)
  3 siblings, 0 replies; 5+ messages in thread
From: Uwe Kleine-König @ 2023-09-17 20:08 UTC (permalink / raw)
  To: James E.J. Bottomley, Martin K. Petersen, Alim Akhtar
  Cc: kernel, linux-arm-kernel, linux-scsi


[-- Attachment #1.1: Type: text/plain, Size: 400 bytes --]

Hello,

FTR: This patch was sent (among others) to Pedro Sousa who is listed as
"M" of drivers/ufs/host/*dwc* in MAINTAINERS. The synopsys mail server
however told me that this email address doesn't exist any more.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

[-- Attachment #1.2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

[-- Attachment #2: Type: text/plain, Size: 176 bytes --]

_______________________________________________
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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] scsi: ufs: Convert all platform drivers to return void
  2023-09-17 14:57 [PATCH] scsi: ufs: Convert all platform drivers to return void Uwe Kleine-König
  2023-09-17 20:08 ` Uwe Kleine-König
@ 2023-09-17 20:14 ` Bean Huo
  2023-09-22  1:48 ` Martin K. Petersen
  2023-09-27 19:34 ` Martin K. Petersen
  3 siblings, 0 replies; 5+ messages in thread
From: Bean Huo @ 2023-09-17 20:14 UTC (permalink / raw)
  To: Uwe Kleine-König, James E.J. Bottomley, Martin K. Petersen,
	Pedro Sousa, Alim Akhtar
  Cc: linux-scsi, linux-arm-kernel, kernel

Review-by: Bean Huo <beanhuo@micron.com>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] scsi: ufs: Convert all platform drivers to return void
  2023-09-17 14:57 [PATCH] scsi: ufs: Convert all platform drivers to return void Uwe Kleine-König
  2023-09-17 20:08 ` Uwe Kleine-König
  2023-09-17 20:14 ` Bean Huo
@ 2023-09-22  1:48 ` Martin K. Petersen
  2023-09-27 19:34 ` Martin K. Petersen
  3 siblings, 0 replies; 5+ messages in thread
From: Martin K. Petersen @ 2023-09-22  1:48 UTC (permalink / raw)
  To: Uwe Kleine-König
  Cc: James E.J. Bottomley, Martin K. Petersen, Pedro Sousa,
	Alim Akhtar, linux-scsi, linux-arm-kernel, kernel


Uwe,

> 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() is renamed to
> .remove().
>
> All platform drivers below drivers/ufs/ unconditionally return zero in
> their remove callback and so can be converted trivially to the variant
> returning void.

Applied to 6.7/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH] scsi: ufs: Convert all platform drivers to return void
  2023-09-17 14:57 [PATCH] scsi: ufs: Convert all platform drivers to return void Uwe Kleine-König
                   ` (2 preceding siblings ...)
  2023-09-22  1:48 ` Martin K. Petersen
@ 2023-09-27 19:34 ` Martin K. Petersen
  3 siblings, 0 replies; 5+ messages in thread
From: Martin K. Petersen @ 2023-09-27 19:34 UTC (permalink / raw)
  To: James E.J. Bottomley, Pedro Sousa, Alim Akhtar,
	Uwe Kleine-König
  Cc: Martin K . Petersen, linux-scsi, linux-arm-kernel, kernel

On Sun, 17 Sep 2023 16:57:22 +0200, Uwe Kleine-König wrote:

> 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() is renamed to .remove().
> 
> [...]

Applied to 6.7/scsi-queue, thanks!

[1/1] scsi: ufs: Convert all platform drivers to return void
      https://git.kernel.org/mkp/scsi/c/0842b7617e34

-- 
Martin K. Petersen	Oracle Linux Engineering

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linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2023-09-27 19:35 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-09-17 14:57 [PATCH] scsi: ufs: Convert all platform drivers to return void Uwe Kleine-König
2023-09-17 20:08 ` Uwe Kleine-König
2023-09-17 20:14 ` Bean Huo
2023-09-22  1:48 ` Martin K. Petersen
2023-09-27 19:34 ` Martin K. Petersen

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