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Subject[PATCH v1 2/2] mei: bus: change remove callback to return void
Date
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@kleine-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 +---
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,
--
2.29.2
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