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vio: make remove callback return void 

The driver core ignores the return value of struct bus_type::remove()
because there is only little that can be done. To simplify the quest to
make this function return void, let struct vio_driver::remove() return
void, too. All users already unconditionally return 0, this commit makes
it obvious that returning an error code is a bad idea.

Note there are two nominally different implementations for a vio bus:
one in arch/sparc/kernel/vio.c and the other in
arch/powerpc/platforms/pseries/vio.c. This patch only adapts the powerpc
one.

Before this patch for a device that was bound to a driver without a
remove callback vio_cmo_bus_remove(viodev) wasn't called. As the device
core still considers the device unbound after vio_bus_remove() returns
calling this unconditionally is the consistent behaviour which is
implemented here.

Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Acked-by: Lijun Pan <ljp@linux.ibm.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[mpe: Drop unneeded hvcs_remove() forward declaration, squash in
 change from sfr to drop ibmvnic_remove() forward declaration]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210225221834.160083-1-uwe@kleine-koenig.org
master
Uwe Kleine-König 2021-02-25 23:18:34 +01:00 committed by Michael Ellerman
parent 91b6c5dbe9
commit 386a966f5c
13 changed files with 15 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/vio.h
View File

@ -113,7 +113,7 @@ struct vio_driver {
const char *name;
const struct vio_device_id *id_table;
int (*probe)(struct vio_dev *dev, const struct vio_device_id *id);
int (*remove)(struct vio_dev *dev);
void (*remove)(struct vio_dev *dev);
/* A driver must have a get_desired_dma() function to
* be loaded in a CMO environment if it uses DMA.
*/

7
arch/powerpc/platforms/pseries/vio.c
View File

@ -1261,7 +1261,6 @@ static int vio_bus_remove(struct device *dev)
struct vio_dev *viodev = to_vio_dev(dev);
struct vio_driver *viodrv = to_vio_driver(dev->driver);
struct device *devptr;
int ret = 1;
/*
* Hold a reference to the device after the remove function is called
@ -1270,13 +1269,13 @@ static int vio_bus_remove(struct device *dev)
devptr = get_device(dev);
if (viodrv->remove)
ret = viodrv->remove(viodev);
viodrv->remove(viodev);
if (!ret && firmware_has_feature(FW_FEATURE_CMO))
if (firmware_has_feature(FW_FEATURE_CMO))
vio_cmo_bus_remove(viodev);
put_device(devptr);
return ret;
return 0;
}
/**

3
drivers/char/hw_random/pseries-rng.c
View File

@ -54,10 +54,9 @@ static int pseries_rng_probe(struct vio_dev *dev,
return hwrng_register(&pseries_rng);
}
static int pseries_rng_remove(struct vio_dev *dev)
static void pseries_rng_remove(struct vio_dev *dev)
{
hwrng_unregister(&pseries_rng);
return 0;
}
static const struct vio_device_id pseries_rng_driver_ids[] = {

4
drivers/char/tpm/tpm_ibmvtpm.c
View File

@ -343,7 +343,7 @@ static int ibmvtpm_crq_send_init_complete(struct ibmvtpm_dev *ibmvtpm)
*
* Return: Always 0.
*/
static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
static void tpm_ibmvtpm_remove(struct vio_dev *vdev)
{
struct tpm_chip *chip = dev_get_drvdata(&vdev->dev);
struct ibmvtpm_dev *ibmvtpm = dev_get_drvdata(&chip->dev);
@ -372,8 +372,6 @@ static int tpm_ibmvtpm_remove(struct vio_dev *vdev)
kfree(ibmvtpm);
/* For tpm_ibmvtpm_get_desired_dma */
dev_set_drvdata(&vdev->dev, NULL);
return 0;
}
/**

4
drivers/crypto/nx/nx-842-pseries.c
View File

@ -1042,7 +1042,7 @@ error:
return ret;
}
static int nx842_remove(struct vio_dev *viodev)
static void nx842_remove(struct vio_dev *viodev)
{
struct nx842_devdata *old_devdata;
unsigned long flags;
@ -1063,8 +1063,6 @@ static int nx842_remove(struct vio_dev *viodev)
if (old_devdata)
kfree(old_devdata->counters);
kfree(old_devdata);
return 0;
}
static const struct vio_device_id nx842_vio_driver_ids[] = {

4
drivers/crypto/nx/nx.c
View File

@ -783,7 +783,7 @@ static int nx_probe(struct vio_dev *viodev, const struct vio_device_id *id)
return nx_register_algs();
}
static int nx_remove(struct vio_dev *viodev)
static void nx_remove(struct vio_dev *viodev)
{
dev_dbg(&viodev->dev, "entering nx_remove for UA 0x%x\n",
viodev->unit_address);
@ -811,8 +811,6 @@ static int nx_remove(struct vio_dev *viodev)
nx_unregister_skcipher(&nx_ecb_aes_alg, NX_FC_AES,
NX_MODE_AES_ECB);
}
return 0;
}

4
drivers/misc/ibmvmc.c
View File

@ -2288,15 +2288,13 @@ crq_failed:
return -EPERM;
}
static int ibmvmc_remove(struct vio_dev *vdev)
static void ibmvmc_remove(struct vio_dev *vdev)
{
struct crq_server_adapter *adapter = dev_get_drvdata(&vdev->dev);
dev_info(adapter->dev, "Entering remove for UA 0x%x\n",
vdev->unit_address);
ibmvmc_release_crq_queue(adapter);
return 0;
}
static struct vio_device_id ibmvmc_device_table[] = {

4
drivers/net/ethernet/ibm/ibmveth.c
View File

@ -1758,7 +1758,7 @@ static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
return 0;
}
static int ibmveth_remove(struct vio_dev *dev)
static void ibmveth_remove(struct vio_dev *dev)
{
struct net_device *netdev = dev_get_drvdata(&dev->dev);
struct ibmveth_adapter *adapter = netdev_priv(netdev);
@ -1771,8 +1771,6 @@ static int ibmveth_remove(struct vio_dev *dev)
free_netdev(netdev);
dev_set_drvdata(&dev->dev, NULL);
return 0;
}
static struct attribute veth_active_attr;

5
drivers/net/ethernet/ibm/ibmvnic.c
View File

@ -78,7 +78,6 @@ MODULE_LICENSE("GPL");
MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
static int ibmvnic_remove(struct vio_dev *);
static void release_sub_crqs(struct ibmvnic_adapter *, bool);
static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
@ -5396,7 +5395,7 @@ ibmvnic_init_fail:
return rc;
}
static int ibmvnic_remove(struct vio_dev *dev)
static void ibmvnic_remove(struct vio_dev *dev)
{
struct net_device *netdev = dev_get_drvdata(&dev->dev);
struct ibmvnic_adapter *adapter = netdev_priv(netdev);
@ -5437,8 +5436,6 @@ static int ibmvnic_remove(struct vio_dev *dev)
device_remove_file(&dev->dev, &dev_attr_failover);
free_netdev(netdev);
dev_set_drvdata(&dev->dev, NULL);
return 0;
}
static ssize_t failover_store(struct device *dev, struct device_attribute *attr,

3
drivers/scsi/ibmvscsi/ibmvfc.c
View File

@ -6038,7 +6038,7 @@ out:
* Return value:
* 0
**/
static int ibmvfc_remove(struct vio_dev *vdev)
static void ibmvfc_remove(struct vio_dev *vdev)
{
struct ibmvfc_host *vhost = dev_get_drvdata(&vdev->dev);
LIST_HEAD(purge);
@ -6070,7 +6070,6 @@ static int ibmvfc_remove(struct vio_dev *vdev)
spin_unlock(&ibmvfc_driver_lock);
scsi_host_put(vhost->host);
LEAVE;
return 0;
}
/**

4
drivers/scsi/ibmvscsi/ibmvscsi.c
View File

@ -2335,7 +2335,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
return -1;
}
static int ibmvscsi_remove(struct vio_dev *vdev)
static void ibmvscsi_remove(struct vio_dev *vdev)
{
struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
@ -2356,8 +2356,6 @@ static int ibmvscsi_remove(struct vio_dev *vdev)
spin_unlock(&ibmvscsi_driver_lock);
scsi_host_put(hostdata->host);
return 0;
}
/**

4
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
View File

@ -3595,7 +3595,7 @@ free_adapter:
return rc;
}
static int ibmvscsis_remove(struct vio_dev *vdev)
static void ibmvscsis_remove(struct vio_dev *vdev)
{
struct scsi_info *vscsi = dev_get_drvdata(&vdev->dev);
@ -3622,8 +3622,6 @@ static int ibmvscsis_remove(struct vio_dev *vdev)
list_del(&vscsi->list);
spin_unlock_bh(&ibmvscsis_dev_lock);
kfree(vscsi);
return 0;
}
static ssize_t system_id_show(struct device *dev,

4
drivers/tty/hvc/hvcs.c
View File

@ -317,7 +317,6 @@ static void hvcs_hangup(struct tty_struct * tty);
static int hvcs_probe(struct vio_dev *dev,
const struct vio_device_id *id);
static int hvcs_remove(struct vio_dev *dev);
static int __init hvcs_module_init(void);
static void __exit hvcs_module_exit(void);
static int hvcs_initialize(void);
@ -819,7 +818,7 @@ static int hvcs_probe(
return 0;
}
static int hvcs_remove(struct vio_dev *dev)
static void hvcs_remove(struct vio_dev *dev)
{
struct hvcs_struct *hvcsd = dev_get_drvdata(&dev->dev);
unsigned long flags;
@ -849,7 +848,6 @@ static int hvcs_remove(struct vio_dev *dev)
printk(KERN_INFO "HVCS: vty-server@%X removed from the"
" vio bus.\n", dev->unit_address);
return 0;
};
static struct vio_driver hvcs_vio_driver = {