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Message-ID: <3bf2c0dd-9c96-573c-e9db-dd0c66ff1523@roeck-us.net>
Date: Sun, 7 Feb 2021 15:48:10 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Uwe Kleine-König <uwe@...ine-koenig.org>,
Tomas Winkler <tomas.winkler@...el.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Wim Van Sebroeck <wim@...ux-watchdog.org>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v1 2/2] mei: bus: change remove callback to return void
On 2/7/21 2:22 PM, Uwe Kleine-König wrote:
> The driver core ignores the return value of mei_cl_device_remove() so
> passing an error value doesn't solve any problem. As most mei drivers'
> remove callbacks return 0 unconditionally and returning a different value
> doesn't have any effect, change this prototype to return void and return 0
> unconditionally in mei_cl_device_remove(). The only driver that could
> return an error value is modified to emit an explicit warning in the error
> case.
>
> Signed-off-by: Uwe Kleine-König <uwe@...ine-koenig.org>
> ---
> drivers/misc/mei/bus.c | 5 ++---
> drivers/misc/mei/hdcp/mei_hdcp.c | 7 +++++--
> drivers/nfc/microread/mei.c | 4 +---
> drivers/nfc/pn544/mei.c | 4 +---
> drivers/watchdog/mei_wdt.c | 4 +---
Acked-by: Guenter Roeck <linux@...ck-us.net>
> include/linux/mei_cl_bus.h | 2 +-
> 6 files changed, 11 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c
> index 50d617e7467e..54dddae46705 100644
> --- a/drivers/misc/mei/bus.c
> +++ b/drivers/misc/mei/bus.c
> @@ -879,17 +879,16 @@ static int mei_cl_device_remove(struct device *dev)
> {
> struct mei_cl_device *cldev = to_mei_cl_device(dev);
> struct mei_cl_driver *cldrv = to_mei_cl_driver(dev->driver);
> - int ret = 0;
>
> if (cldrv->remove)
> - ret = cldrv->remove(cldev);
> + cldrv->remove(cldev);
>
> mei_cldev_unregister_callbacks(cldev);
>
> mei_cl_bus_module_put(cldev);
> module_put(THIS_MODULE);
>
> - return ret;
> + return 0;
> }
>
> static ssize_t name_show(struct device *dev, struct device_attribute *a,
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 9ae9669e46ea..6a455ebe4891 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -845,16 +845,19 @@ static int mei_hdcp_probe(struct mei_cl_device *cldev,
> return ret;
> }
>
> -static int mei_hdcp_remove(struct mei_cl_device *cldev)
> +static void mei_hdcp_remove(struct mei_cl_device *cldev)
> {
> struct i915_hdcp_comp_master *comp_master =
> mei_cldev_get_drvdata(cldev);
> + int ret;
>
> component_master_del(&cldev->dev, &mei_component_master_ops);
> kfree(comp_master);
> mei_cldev_set_drvdata(cldev, NULL);
>
> - return mei_cldev_disable(cldev);
> + ret = mei_cldev_disable(cldev);
> + if (ret)
> + dev_warn(&cldev->dev, "mei_cldev_disable() failed\n")
> }
>
> #define MEI_UUID_HDCP GUID_INIT(0xB638AB7E, 0x94E2, 0x4EA2, 0xA5, \
> diff --git a/drivers/nfc/microread/mei.c b/drivers/nfc/microread/mei.c
> index 5dad8847a9b3..8fa7771085eb 100644
> --- a/drivers/nfc/microread/mei.c
> +++ b/drivers/nfc/microread/mei.c
> @@ -44,15 +44,13 @@ static int microread_mei_probe(struct mei_cl_device *cldev,
> return 0;
> }
>
> -static int microread_mei_remove(struct mei_cl_device *cldev)
> +static void microread_mei_remove(struct mei_cl_device *cldev)
> {
> struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
>
> microread_remove(phy->hdev);
>
> nfc_mei_phy_free(phy);
> -
> - return 0;
> }
>
> static struct mei_cl_device_id microread_mei_tbl[] = {
> diff --git a/drivers/nfc/pn544/mei.c b/drivers/nfc/pn544/mei.c
> index 579bc599f545..5c10aac085a4 100644
> --- a/drivers/nfc/pn544/mei.c
> +++ b/drivers/nfc/pn544/mei.c
> @@ -42,7 +42,7 @@ static int pn544_mei_probe(struct mei_cl_device *cldev,
> return 0;
> }
>
> -static int pn544_mei_remove(struct mei_cl_device *cldev)
> +static void pn544_mei_remove(struct mei_cl_device *cldev)
> {
> struct nfc_mei_phy *phy = mei_cldev_get_drvdata(cldev);
>
> @@ -51,8 +51,6 @@ static int pn544_mei_remove(struct mei_cl_device *cldev)
> pn544_hci_remove(phy->hdev);
>
> nfc_mei_phy_free(phy);
> -
> - return 0;
> }
>
> static struct mei_cl_device_id pn544_mei_tbl[] = {
> diff --git a/drivers/watchdog/mei_wdt.c b/drivers/watchdog/mei_wdt.c
> index 5391bf3e6b11..53165e49c298 100644
> --- a/drivers/watchdog/mei_wdt.c
> +++ b/drivers/watchdog/mei_wdt.c
> @@ -619,7 +619,7 @@ static int mei_wdt_probe(struct mei_cl_device *cldev,
> return ret;
> }
>
> -static int mei_wdt_remove(struct mei_cl_device *cldev)
> +static void mei_wdt_remove(struct mei_cl_device *cldev)
> {
> struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
>
> @@ -636,8 +636,6 @@ static int mei_wdt_remove(struct mei_cl_device *cldev)
> dbgfs_unregister(wdt);
>
> kfree(wdt);
> -
> - return 0;
> }
>
> #define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
> diff --git a/include/linux/mei_cl_bus.h b/include/linux/mei_cl_bus.h
> index 959ad7d850b4..07f5ef8fc456 100644
> --- a/include/linux/mei_cl_bus.h
> +++ b/include/linux/mei_cl_bus.h
> @@ -68,7 +68,7 @@ struct mei_cl_driver {
>
> int (*probe)(struct mei_cl_device *cldev,
> const struct mei_cl_device_id *id);
> - int (*remove)(struct mei_cl_device *cldev);
> + void (*remove)(struct mei_cl_device *cldev);
> };
>
> int __mei_cldev_driver_register(struct mei_cl_driver *cldrv,
>
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