Re: net: struct device - replace bus_id with dev_name(),dev_set_name()

From: Kay Sievers
Date: Fri Nov 07 2008 - 06:30:35 EST

On Thu, 2008-10-30 at 02:15 +0100, Kay Sievers wrote:
> This patch is part of a larger patch series which will remove
> the "char bus_id[20]" name string from struct device. The device
> name is managed in the kobject anyway, and without any size
> limitation, and just needlessly copied into "struct device".
>
> To set and read the device name dev_name(dev) and dev_set_name(dev)
> must be used. If your code uses static kobjects, which it shouldn't
> do, "const char *init_name" can be used to statically provide the
> name the registered device should have. At registration time, the
> init_name field is cleared, to enforce the use of dev_name(dev) to
> access the device name at a later time.
>
> We need to get rid of all occurrences of bus_id in the entire tree
> to be able to enable the new interface. Please apply this patch,
> and possibly convert any remaining remaining occurrences of bus_id.
>
> We want to submit a patch to -next, which will remove bus_id from
> "struct device", to find the remaining pieces to convert, and finally
> switch over to the new api, which will remove the 20 bytes array
> and does no longer have a size limitation.

Updated patch, which does not replace BUS_ID_SIZE for now.

(BUS_ID_SIZE will go away from the driver core after the API switch, and
it has to be replaced by a local definition in the network tree, or the
limit can be removed entirely.)

Thanks,
Kay


From: Kay Sievers <kay.sievers@xxxxxxxx>
Subject: net: struct device - replace bus_id with dev_name(), dev_set_name()

CC: David S. Miller <davem@xxxxxxxxxxxxx>
Acked-by: Marcel Holtmann <marcel@xxxxxxxxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
Signed-off-by: Kay Sievers <kay.sievers@xxxxxxxx>
---
drivers/net/3c59x.c | 4 ++--
drivers/net/defxx.c | 2 +-
drivers/net/enc28j60.c | 2 +-
drivers/net/fec_mpc52xx.c | 2 +-
drivers/net/gianfar.c | 2 +-
drivers/net/mlx4/mlx4_en.h | 8 ++++----
drivers/net/pasemi_mac.c | 3 ++-
drivers/net/phy/mdio_bus.c | 4 ++--
drivers/net/phy/phy.c | 2 +-
drivers/net/phy/phy_device.c | 4 ++--
drivers/net/sh_eth.c | 2 +-
drivers/net/tg3.c | 4 ++--
drivers/net/tulip/de4x5.c | 4 ++--
drivers/net/ucc_geth.c | 4 ++--
drivers/net/wireless/libertas/defs.h | 2 +-
drivers/net/wireless/orinoco.c | 2 +-
drivers/net/wireless/orinoco_cs.c | 2 +-
drivers/net/wireless/spectrum_cs.c | 2 +-
include/net/wireless.h | 4 ++--
net/atm/atm_sysfs.c | 2 +-
net/bluetooth/hci_sysfs.c | 7 +++----
net/core/net-sysfs.c | 2 +-
net/dsa/slave.c | 2 +-
net/rfkill/rfkill.c | 5 ++---
net/wireless/core.c | 3 +--
25 files changed, 39 insertions(+), 41 deletions(-)

--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -1025,7 +1025,7 @@ static int __devinit vortex_probe1(struc
}

if ((edev = DEVICE_EISA(gendev))) {
- print_name = edev->dev.bus_id;
+ print_name = dev_name(&edev->dev);
}
}

@@ -2883,7 +2883,7 @@ static void vortex_get_drvinfo(struct ne
strcpy(info->bus_info, pci_name(VORTEX_PCI(vp)));
} else {
if (VORTEX_EISA(vp))
- sprintf(info->bus_info, vp->gendev->bus_id);
+ sprintf(info->bus_info, dev_name(vp->gendev));
else
sprintf(info->bus_info, "EISA 0x%lx %d",
dev->base_addr, dev->irq);
--- a/drivers/net/defxx.c
+++ b/drivers/net/defxx.c
@@ -511,7 +511,7 @@ static int __devinit dfx_register(struct
int dfx_bus_pci = DFX_BUS_PCI(bdev);
int dfx_bus_tc = DFX_BUS_TC(bdev);
int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
- char *print_name = bdev->bus_id;
+ const char *print_name = dev_name(bdev);
struct net_device *dev;
DFX_board_t *bp; /* board pointer */
resource_size_t bar_start = 0; /* pointer to port */
--- a/drivers/net/enc28j60.c
+++ b/drivers/net/enc28j60.c
@@ -1448,7 +1448,7 @@ enc28j60_get_drvinfo(struct net_device *
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
strlcpy(info->bus_info,
- dev->dev.parent->bus_id, sizeof(info->bus_info));
+ dev_name(dev->dev.parent), sizeof(info->bus_info));
}

static int
--- a/drivers/net/fec_mpc52xx.c
+++ b/drivers/net/fec_mpc52xx.c
@@ -216,7 +216,7 @@ static int mpc52xx_fec_init_phy(struct n
struct phy_device *phydev;
char phy_id[BUS_ID_SIZE];

- snprintf(phy_id, BUS_ID_SIZE, "%x:%02x",
+ snprintf(phy_id, sizeof(phy_id), "%x:%02x",
(unsigned int)dev->base_addr, priv->phy_addr);

priv->link = PHY_DOWN;
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -546,7 +546,7 @@ static int init_phy(struct net_device *d
priv->oldspeed = 0;
priv->oldduplex = -1;

- snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, priv->einfo->bus_id, priv->einfo->phy_id);
+ snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT, priv->einfo->bus_id, priv->einfo->phy_id);

interface = gfar_get_interface(dev);

--- a/drivers/net/mlx4/mlx4_en.h
+++ b/drivers/net/mlx4/mlx4_en.h
@@ -58,17 +58,17 @@
#define mlx4_dbg(mlevel, priv, format, arg...) \
if (NETIF_MSG_##mlevel & priv->msg_enable) \
printk(KERN_DEBUG "%s %s: " format , DRV_NAME ,\
- (&priv->mdev->pdev->dev)->bus_id , ## arg)
+ (dev_name(&priv->mdev->pdev->dev)) , ## arg)

#define mlx4_err(mdev, format, arg...) \
printk(KERN_ERR "%s %s: " format , DRV_NAME ,\
- (&mdev->pdev->dev)->bus_id , ## arg)
+ (dev_name(&mdev->pdev->dev)) , ## arg)
#define mlx4_info(mdev, format, arg...) \
printk(KERN_INFO "%s %s: " format , DRV_NAME ,\
- (&mdev->pdev->dev)->bus_id , ## arg)
+ (dev_name(&mdev->pdev->dev)) , ## arg)
#define mlx4_warn(mdev, format, arg...) \
printk(KERN_WARNING "%s %s: " format , DRV_NAME ,\
- (&mdev->pdev->dev)->bus_id , ## arg)
+ (dev_name(&mdev->pdev->dev)) , ## arg)

/*
* Device constants
--- a/drivers/net/pasemi_mac.c
+++ b/drivers/net/pasemi_mac.c
@@ -1105,7 +1105,8 @@ static int pasemi_mac_phy_init(struct ne
goto err;

phy_id = *prop;
- snprintf(mac->phy_id, BUS_ID_SIZE, "%x:%02x", (int)r.start, phy_id);
+ snprintf(mac->phy_id, sizeof(mac->phy_id), "%x:%02x",
+ (int)r.start, phy_id);

of_node_put(phy_dn);

--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -97,7 +97,7 @@ int mdiobus_register(struct mii_bus *bus
bus->dev.parent = bus->parent;
bus->dev.class = &mdio_bus_class;
bus->dev.groups = NULL;
- memcpy(bus->dev.bus_id, bus->id, MII_BUS_ID_SIZE);
+ dev_set_name(&bus->dev, bus->id);

err = device_register(&bus->dev);
if (err) {
@@ -191,7 +191,7 @@ struct phy_device *mdiobus_scan(struct m

phydev->dev.parent = bus->parent;
phydev->dev.bus = &mdio_bus_type;
- snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, addr);
+ dev_set_name(&phydev->dev, PHY_ID_FMT, bus->id, addr);

phydev->bus = bus;

--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -45,7 +45,7 @@
*/
void phy_print_status(struct phy_device *phydev)
{
- pr_info("PHY: %s - Link is %s", phydev->dev.bus_id,
+ pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev),
phydev->link ? "Up" : "Down");
if (phydev->link)
printk(" - %d/%s", phydev->speed,
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -74,7 +74,7 @@ int phy_register_fixup(const char *bus_i
if (!fixup)
return -ENOMEM;

- strncpy(fixup->bus_id, bus_id, BUS_ID_SIZE);
+ strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
fixup->phy_uid = phy_uid;
fixup->phy_uid_mask = phy_uid_mask;
fixup->run = run;
@@ -109,7 +109,7 @@ EXPORT_SYMBOL(phy_register_fixup_for_id)
*/
static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
{
- if (strcmp(fixup->bus_id, phydev->dev.bus_id) != 0)
+ if (strcmp(fixup->bus_id, dev_name(&phydev->dev)) != 0)
if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
return 0;

--- a/drivers/net/sh_eth.c
+++ b/drivers/net/sh_eth.c
@@ -799,7 +799,7 @@ static int sh_eth_phy_init(struct net_de
char phy_id[BUS_ID_SIZE];
struct phy_device *phydev = NULL;

- snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT,
+ snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT,
mdp->mii_bus->id , mdp->phy_id);

mdp->link = PHY_DOWN;
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -1396,7 +1396,7 @@ static int tg3_phy_init(struct tg3 *tp)
phydev = tp->mdio_bus->phy_map[PHY_ADDR];

/* Attach the MAC to the PHY. */
- phydev = phy_connect(tp->dev, phydev->dev.bus_id, tg3_adjust_link,
+ phydev = phy_connect(tp->dev, dev_name(&phydev->dev), tg3_adjust_link,
phydev->dev_flags, phydev->interface);
if (IS_ERR(phydev)) {
printk(KERN_ERR "%s: Could not attach to PHY\n", tp->dev->name);
@@ -13645,7 +13645,7 @@ static int __devinit tg3_init_one(struct
"%s: attached PHY driver [%s] (mii_bus:phy_addr=%s)\n",
tp->dev->name,
tp->mdio_bus->phy_map[PHY_ADDR]->drv->name,
- tp->mdio_bus->phy_map[PHY_ADDR]->dev.bus_id);
+ dev_name(&tp->mdio_bus->phy_map[PHY_ADDR]->dev));
else
printk(KERN_INFO
"%s: attached PHY is %s (%s Ethernet) (WireSpeed[%d])\n",
--- a/drivers/net/tulip/de4x5.c
+++ b/drivers/net/tulip/de4x5.c
@@ -1118,7 +1118,7 @@ de4x5_hw_init(struct net_device *dev, u_
}

dev->base_addr = iobase;
- printk ("%s: %s at 0x%04lx", gendev->bus_id, name, iobase);
+ printk ("%s: %s at 0x%04lx", dev_name(gendev), name, iobase);

status = get_hw_addr(dev);
printk(", h/w address %pM\n", dev->dev_addr);
@@ -1153,7 +1153,7 @@ de4x5_hw_init(struct net_device *dev, u_
}
}
lp->fdx = lp->params.fdx;
- sprintf(lp->adapter_name,"%s (%s)", name, gendev->bus_id);
+ sprintf(lp->adapter_name,"%s (%s)", name, dev_name(gendev));

lp->dma_size = (NUM_RX_DESC + NUM_TX_DESC) * sizeof(struct de4x5_desc);
#if defined(__alpha__) || defined(__powerpc__) || defined(CONFIG_SPARC) || defined(DE4X5_DO_MEMCPY)
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -1615,8 +1615,8 @@ static int init_phy(struct net_device *d
priv->oldspeed = 0;
priv->oldduplex = -1;

- snprintf(phy_id, BUS_ID_SIZE, PHY_ID_FMT, priv->ug_info->mdio_bus,
- priv->ug_info->phy_address);
+ snprintf(phy_id, sizeof(phy_id), PHY_ID_FMT, priv->ug_info->mdio_bus,
+ priv->ug_info->phy_address);

phydev = phy_connect(dev, phy_id, &adjust_link, 0, priv->phy_interface);

--- a/drivers/net/wireless/libertas/defs.h
+++ b/drivers/net/wireless/libertas/defs.h
@@ -79,7 +79,7 @@ do { if ((lbs_debug & (grp)) == (grp)) \
#define lbs_deb_tx(fmt, args...) LBS_DEB_LL(LBS_DEB_TX, " tx", fmt, ##args)
#define lbs_deb_fw(fmt, args...) LBS_DEB_LL(LBS_DEB_FW, " fw", fmt, ##args)
#define lbs_deb_usb(fmt, args...) LBS_DEB_LL(LBS_DEB_USB, " usb", fmt, ##args)
-#define lbs_deb_usbd(dev, fmt, args...) LBS_DEB_LL(LBS_DEB_USB, " usbd", "%s:" fmt, (dev)->bus_id, ##args)
+#define lbs_deb_usbd(dev, fmt, args...) LBS_DEB_LL(LBS_DEB_USB, " usbd", "%s:" fmt, dev_name(dev), ##args)
#define lbs_deb_cs(fmt, args...) LBS_DEB_LL(LBS_DEB_CS, " cs", fmt, ##args)
#define lbs_deb_thread(fmt, args...) LBS_DEB_LL(LBS_DEB_THREAD, " thread", fmt, ##args)
#define lbs_deb_sdio(fmt, args...) LBS_DEB_LL(LBS_DEB_SDIO, " sdio", fmt, ##args)
--- a/drivers/net/wireless/orinoco.c
+++ b/drivers/net/wireless/orinoco.c
@@ -5985,7 +5985,7 @@ static void orinoco_get_drvinfo(struct n
strncpy(info->version, DRIVER_VERSION, sizeof(info->version) - 1);
strncpy(info->fw_version, priv->fw_name, sizeof(info->fw_version) - 1);
if (dev->dev.parent)
- strncpy(info->bus_info, dev->dev.parent->bus_id,
+ strncpy(info->bus_info, dev_name(dev->dev.parent),
sizeof(info->bus_info) - 1);
else
snprintf(info->bus_info, sizeof(info->bus_info) - 1,
--- a/drivers/net/wireless/orinoco_cs.c
+++ b/drivers/net/wireless/orinoco_cs.c
@@ -308,7 +308,7 @@ orinoco_cs_config(struct pcmcia_device *

/* Finally, report what we've done */
printk(KERN_DEBUG "%s: " DRIVER_NAME " at %s, irq %d, io "
- "0x%04x-0x%04x\n", dev->name, dev->dev.parent->bus_id,
+ "0x%04x-0x%04x\n", dev->name, dev_name(dev->dev.parent),
link->irq.AssignedIRQ, link->io.BasePort1,
link->io.BasePort1 + link->io.NumPorts1 - 1);
return 0;
--- a/drivers/net/wireless/spectrum_cs.c
+++ b/drivers/net/wireless/spectrum_cs.c
@@ -383,7 +383,7 @@ spectrum_cs_config(struct pcmcia_device

/* Finally, report what we've done */
printk(KERN_DEBUG "%s: " DRIVER_NAME " at %s, irq %d, io "
- "0x%04x-0x%04x\n", dev->name, dev->dev.parent->bus_id,
+ "0x%04x-0x%04x\n", dev->name, dev_name(dev->dev.parent),
link->irq.AssignedIRQ, link->io.BasePort1,
link->io.BasePort1 + link->io.NumPorts1 - 1);

--- a/include/net/wireless.h
+++ b/include/net/wireless.h
@@ -263,9 +263,9 @@ static inline struct device *wiphy_dev(s
/**
* wiphy_name - get wiphy name
*/
-static inline char *wiphy_name(struct wiphy *wiphy)
+static inline const char *wiphy_name(struct wiphy *wiphy)
{
- return wiphy->dev.bus_id;
+ return dev_name(&wiphy->dev);
}

/**
--- a/net/atm/atm_sysfs.c
+++ b/net/atm/atm_sysfs.c
@@ -149,7 +149,7 @@ int atm_register_sysfs(struct atm_dev *a
cdev->class = &atm_class;
dev_set_drvdata(cdev, adev);

- snprintf(cdev->bus_id, BUS_ID_SIZE, "%s%d", adev->type, adev->number);
+ dev_set_name(cdev, "%s%d", adev->type, adev->number);
err = device_register(cdev);
if (err < 0)
return err;
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -113,8 +113,7 @@ void hci_conn_add_sysfs(struct hci_conn
conn->dev.class = bt_class;
conn->dev.parent = &hdev->dev;

- snprintf(conn->dev.bus_id, BUS_ID_SIZE, "%s:%d",
- hdev->name, conn->handle);
+ dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle);

dev_set_drvdata(&conn->dev, conn);

@@ -132,7 +131,7 @@ void hci_conn_add_sysfs(struct hci_conn
*/
static int __match_tty(struct device *dev, void *data)
{
- return !strncmp(dev->bus_id, "rfcomm", 6);
+ return !strncmp(dev_name(dev), "rfcomm", 6);
}

static void del_conn(struct work_struct *work)
@@ -421,7 +420,7 @@ int hci_register_sysfs(struct hci_dev *h
dev->class = bt_class;
dev->parent = hdev->parent;

- strlcpy(dev->bus_id, hdev->name, BUS_ID_SIZE);
+ dev_set_name(dev, hdev->name);

dev_set_drvdata(dev, hdev);

--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -494,7 +494,7 @@ int netdev_register_kobject(struct net_d
dev->groups = groups;

BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
- strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);
+ dev_set_name(dev, net->name);

#ifdef CONFIG_SYSFS
*groups++ = &netstat_group;
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -284,7 +284,7 @@ dsa_slave_create(struct dsa_switch *ds,
netif_carrier_off(slave_dev);

if (p->phy != NULL) {
- phy_attach(slave_dev, p->phy->dev.bus_id,
+ phy_attach(slave_dev, dev_name(&p->phy->dev),
0, PHY_INTERFACE_MODE_GMII);

p->phy->autoneg = AUTONEG_ENABLE;
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -774,7 +774,7 @@ static void rfkill_led_trigger_register(
int error;

if (!rfkill->led_trigger.name)
- rfkill->led_trigger.name = rfkill->dev.bus_id;
+ rfkill->led_trigger.name = dev_name(&rfkill->dev);
if (!rfkill->led_trigger.activate)
rfkill->led_trigger.activate = rfkill_led_trigger_activate;
error = led_trigger_register(&rfkill->led_trigger);
@@ -815,8 +815,7 @@ int __must_check rfkill_register(struct
"badly initialized rfkill struct\n"))
return -EINVAL;

- snprintf(dev->bus_id, sizeof(dev->bus_id),
- "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);
+ dev_set_name(dev, "rfkill%ld", (long)atomic_inc_return(&rfkill_no) - 1);

rfkill_led_trigger_register(rfkill);

--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -236,8 +236,7 @@ struct wiphy *wiphy_new(struct cfg80211_
mutex_unlock(&cfg80211_drv_mutex);

/* give it a proper name */
- snprintf(drv->wiphy.dev.bus_id, BUS_ID_SIZE,
- PHY_NAME "%d", drv->idx);
+ dev_set_name(&drv->wiphy.dev, PHY_NAME "%d", drv->idx);

mutex_init(&drv->mtx);
mutex_init(&drv->devlist_mtx);


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