[PATCH 26/28] proc: Supply a function to remove a proc entry by PDE[RFC]

From: David Howells
Date: Tue Apr 16 2013 - 14:27:58 EST

Supply a function (proc_remove()) to remove a proc entry (and any subtree
rooted there) by proc_dir_entry pointer rather than by name and (optionally)
root dir entry pointer. This allows us to eliminate all remaining pde->name
accesses outside of procfs.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
cc: linux-acpi@xxxxxxxxxxxxxxx
cc: openipmi-developer@xxxxxxxxxxxxxxxxxxxxx
cc: devicetree-discuss@xxxxxxxxxxxxxxxx
cc: linux-pci@xxxxxxxxxxxxxxx
cc: netdev@xxxxxxxxxxxxxxx
cc: netfilter-devel@xxxxxxxxxxxxxxx
cc: alsa-devel@xxxxxxxxxxxxxxxx
---

drivers/acpi/sbs.c | 21 ++++-----------------
drivers/char/ipmi/ipmi_msghandler.c | 2 +-
drivers/misc/sgi-gru/gruprocfs.c | 2 +-
drivers/of/base.c | 11 +----------
drivers/pci/proc.c | 12 +++---------
fs/proc/generic.c | 7 +++++++
fs/proc/vmcore.c | 2 +-
include/linux/proc_fs.h | 2 ++
kernel/irq/proc.c | 6 +-----
net/8021q/vlanproc.c | 9 ++-------
net/core/pktgen.c | 6 ++----
net/ipv4/netfilter/ipt_CLUSTERIP.c | 4 ++--
net/ipv6/proc.c | 3 +--
net/netfilter/xt_hashlimit.c | 4 ++--
sound/core/info.c | 19 +++++--------------
15 files changed, 35 insertions(+), 75 deletions(-)

diff --git a/drivers/acpi/sbs.c b/drivers/acpi/sbs.c
index a296e08..b6241ee 100644
--- a/drivers/acpi/sbs.c
+++ b/drivers/acpi/sbs.c
@@ -521,19 +521,6 @@ acpi_sbs_add_fs(struct proc_dir_entry **dir,
return 0;
}

-static void
-acpi_sbs_remove_fs(struct proc_dir_entry **dir,
- struct proc_dir_entry *parent_dir)
-{
- if (*dir) {
- remove_proc_entry(ACPI_SBS_FILE_INFO, *dir);
- remove_proc_entry(ACPI_SBS_FILE_STATE, *dir);
- remove_proc_entry(ACPI_SBS_FILE_ALARM, *dir);
- remove_proc_entry((*dir)->name, parent_dir);
- *dir = NULL;
- }
-}
-
/* Smart Battery Interface */
static struct proc_dir_entry *acpi_battery_dir = NULL;

@@ -836,8 +823,8 @@ static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
power_supply_unregister(&battery->bat);
}
#ifdef CONFIG_ACPI_PROCFS_POWER
- if (battery->proc_entry)
- acpi_sbs_remove_fs(&battery->proc_entry, acpi_battery_dir);
+ proc_remove(battery->proc_entry);
+ battery->proc_entry = NULL;
#endif
}

@@ -873,8 +860,8 @@ static void acpi_charger_remove(struct acpi_sbs *sbs)
if (sbs->charger.dev)
power_supply_unregister(&sbs->charger);
#ifdef CONFIG_ACPI_PROCFS_POWER
- if (sbs->charger_entry)
- acpi_sbs_remove_fs(&sbs->charger_entry, acpi_ac_dir);
+ proc_remove(sbs->charger_entry);
+ sbs->charger_entry = NULL;
#endif
}

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 1420bbb..4d439d2 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -4541,7 +4541,7 @@ static void __exit cleanup_ipmi(void)
del_timer_sync(&ipmi_timer);

#ifdef CONFIG_PROC_FS
- remove_proc_entry(proc_ipmi_root->name, NULL);
+ proc_remove(proc_ipmi_root);
#endif /* CONFIG_PROC_FS */

driver_unregister(&ipmidriver.driver);
diff --git a/drivers/misc/sgi-gru/gruprocfs.c b/drivers/misc/sgi-gru/gruprocfs.c
index 950dbe9..797d796 100644
--- a/drivers/misc/sgi-gru/gruprocfs.c
+++ b/drivers/misc/sgi-gru/gruprocfs.c
@@ -355,7 +355,7 @@ static void delete_proc_files(void)
for (p = proc_files; p->name; p++)
if (p->entry)
remove_proc_entry(p->name, proc_gru);
- remove_proc_entry("gru", proc_gru->parent);
+ proc_remove(proc_gru);
}
}

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 321d3ef..9c70436 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1452,16 +1452,7 @@ int of_attach_node(struct device_node *np)
#ifdef CONFIG_PROC_DEVICETREE
static void of_remove_proc_dt_entry(struct device_node *dn)
{
- struct device_node *parent = dn->parent;
- struct property *prop = dn->properties;
-
- while (prop) {
- remove_proc_entry(prop->name, dn->pde);
- prop = prop->next;
- }
-
- if (dn->pde)
- remove_proc_entry(dn->pde->name, parent->pde);
+ proc_remove(dn->pde);
}
#else
static void of_remove_proc_dt_entry(struct device_node *dn)
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 7cde7c1..0812608 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -427,20 +427,14 @@ int pci_proc_attach_device(struct pci_dev *dev)

int pci_proc_detach_device(struct pci_dev *dev)
{
- struct proc_dir_entry *e;
-
- if ((e = dev->procent)) {
- remove_proc_entry(e->name, dev->bus->procdir);
- dev->procent = NULL;
- }
+ proc_remove(dev->procent);
+ dev->procent = NULL;
return 0;
}

int pci_proc_detach_bus(struct pci_bus* bus)
{
- struct proc_dir_entry *de = bus->procdir;
- if (de)
- remove_proc_entry(de->name, proc_bus_pci_dir);
+ proc_remove(bus->procdir);
return 0;
}

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 2c6d6be..4b48033 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -630,3 +630,10 @@ const char *get_proc_name(const struct proc_dir_entry *de)
return de->name;
}
EXPORT_SYMBOL_GPL(get_proc_name);
+
+void proc_remove(struct proc_dir_entry *de)
+{
+ if (de)
+ remove_proc_subtree(de->name, de->parent);
+}
+EXPORT_SYMBOL(proc_remove);
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 38edddc..17f7e08 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -699,7 +699,7 @@ void vmcore_cleanup(void)
struct list_head *pos, *next;

if (proc_vmcore) {
- remove_proc_entry(proc_vmcore->name, proc_vmcore->parent);
+ proc_remove(proc_vmcore);
proc_vmcore = NULL;
}

diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 7abc72a..b8949b1 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -67,6 +67,7 @@ struct proc_dir_entry *proc_create_data(const char *name, umode_t mode,
struct proc_dir_entry *parent,
const struct file_operations *proc_fops,
void *data);
+extern void proc_remove(struct proc_dir_entry *);
extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent);
extern int remove_proc_subtree(const char *name, struct proc_dir_entry *parent);

@@ -103,6 +104,7 @@ static inline struct proc_dir_entry *proc_create_data(const char *name,
{
return NULL;
}
+static inline void proc_remove(struct proc_dir_entry *de) {}
#define remove_proc_entry(name, parent) do {} while (0)
#define remove_proc_subtree(name, parent) do {} while (0)

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index d59ae37..19ed5c4 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -366,11 +366,7 @@ void unregister_irq_proc(unsigned int irq, struct irq_desc *desc)

void unregister_handler_proc(unsigned int irq, struct irqaction *action)
{
- if (action->dir) {
- struct irq_desc *desc = irq_to_desc(irq);
-
- remove_proc_entry(action->dir->name, desc->dir);
- }
+ proc_remove(action->dir);
}

static void register_default_affinity_proc(void)
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
index 959ddbb..1d0e8921 100644
--- a/net/8021q/vlanproc.c
+++ b/net/8021q/vlanproc.c
@@ -184,14 +184,9 @@ int vlan_proc_add_dev(struct net_device *vlandev)
*/
int vlan_proc_rem_dev(struct net_device *vlandev)
{
- struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
-
/** NOTE: This will consume the memory pointed to by dent, it seems. */
- if (vlan_dev_priv(vlandev)->dent) {
- remove_proc_entry(vlan_dev_priv(vlandev)->dent->name,
- vn->proc_vlan_dir);
- vlan_dev_priv(vlandev)->dent = NULL;
- }
+ proc_remove(vlan_dev_priv(vlandev)->dent);
+ vlan_dev_priv(vlandev)->dent = NULL;
return 0;
}

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index f6af4fe..6c41e97 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1904,7 +1904,7 @@ static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *d
if (pkt_dev->odev != dev)
continue;

- remove_proc_entry(pkt_dev->entry->name, pn->proc_dir);
+ proc_remove(pkt_dev->entry);

pkt_dev->entry = proc_create_data(dev->name, 0600,
pn->proc_dir,
@@ -3576,8 +3576,6 @@ static void _rem_dev_from_if_list(struct pktgen_thread *t,
static int pktgen_remove_device(struct pktgen_thread *t,
struct pktgen_dev *pkt_dev)
{
- struct pktgen_net *pn = t->net;
-
pr_debug("remove_device pkt_dev=%p\n", pkt_dev);

if (pkt_dev->running) {
@@ -3597,7 +3595,7 @@ static int pktgen_remove_device(struct pktgen_thread *t,
_rem_dev_from_if_list(t, pkt_dev);

if (pkt_dev->entry)
- remove_proc_entry(pkt_dev->entry->name, pn->proc_dir);
+ proc_remove(pkt_dev->entry);

#ifdef CONFIG_XFRM
free_SAs(pkt_dev);
diff --git a/net/ipv4/netfilter/ipt_CLUSTERIP.c b/net/ipv4/netfilter/ipt_CLUSTERIP.c
index e4738fe..0b732ef 100644
--- a/net/ipv4/netfilter/ipt_CLUSTERIP.c
+++ b/net/ipv4/netfilter/ipt_CLUSTERIP.c
@@ -105,7 +105,7 @@ clusterip_config_entry_put(struct clusterip_config *c)
* functions are also incrementing the refcount on their own,
* so it's safe to remove the entry even if it's in use. */
#ifdef CONFIG_PROC_FS
- remove_proc_entry(c->pde->name, c->pde->parent);
+ proc_remove(c->pde);
#endif
return;
}
@@ -736,7 +736,7 @@ static void __exit clusterip_tg_exit(void)
{
pr_info("ClusterIP Version %s unloading\n", CLUSTERIP_VERSION);
#ifdef CONFIG_PROC_FS
- remove_proc_entry(clusterip_procdir->name, clusterip_procdir->parent);
+ proc_remove(clusterip_procdir);
#endif
nf_unregister_hook(&cip_arp_ops);
xt_unregister_target(&clusterip_tg_reg);
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 7ea6e18..537d9ee 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -287,8 +287,7 @@ int snmp6_unregister_dev(struct inet6_dev *idev)
return -ENOENT;
if (!idev->stats.proc_dir_entry)
return -EINVAL;
- remove_proc_entry(idev->stats.proc_dir_entry->name,
- net->mib.proc_net_devsnmp6);
+ proc_remove(idev->stats.proc_dir_entry);
idev->stats.proc_dir_entry = NULL;
return 0;
}
diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index d2fd53b..40002ef 100644
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -330,7 +330,7 @@ static void htable_destroy(struct xt_hashlimit_htable *hinfo)
parent = hashlimit_net->ip6t_hashlimit;

if(parent != NULL)
- remove_proc_entry(hinfo->pde->name, parent);
+ proc_remove(hinfo->pde);

htable_selective_cleanup(hinfo, select_all);
vfree(hinfo);
@@ -887,7 +887,7 @@ static void __net_exit hashlimit_proc_net_exit(struct net *net)
pde = hashlimit_net->ip6t_hashlimit;

hlist_for_each_entry(hinfo, &hashlimit_net->htables, node)
- remove_proc_entry(hinfo->pde->name, pde);
+ proc_remove(hinfo->pde);

hashlimit_net->ipt_hashlimit = NULL;
hashlimit_net->ip6t_hashlimit = NULL;
diff --git a/sound/core/info.c b/sound/core/info.c
index c7f41c3..3c9bd6b 100644
--- a/sound/core/info.c
+++ b/sound/core/info.c
@@ -153,13 +153,6 @@ EXPORT_SYMBOL(snd_seq_root);
struct snd_info_entry *snd_oss_root;
#endif

-static void snd_remove_proc_entry(struct proc_dir_entry *parent,
- struct proc_dir_entry *de)
-{
- if (de)
- remove_proc_entry(de->name, parent);
-}
-
static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
{
struct snd_info_private_data *data;
@@ -580,7 +573,7 @@ int __exit snd_info_done(void)
#ifdef CONFIG_SND_OSSEMUL
snd_info_free_entry(snd_oss_root);
#endif
- snd_remove_proc_entry(NULL, snd_proc_root);
+ proc_remove(snd_proc_root);
}
return 0;
}
@@ -642,7 +635,7 @@ void snd_info_card_id_change(struct snd_card *card)
{
mutex_lock(&info_mutex);
if (card->proc_root_link) {
- snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
+ proc_remove(card->proc_root_link);
card->proc_root_link = NULL;
}
if (strcmp(card->id, card->proc_root->name))
@@ -661,10 +654,8 @@ void snd_info_card_disconnect(struct snd_card *card)
if (!card)
return;
mutex_lock(&info_mutex);
- if (card->proc_root_link) {
- snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
- card->proc_root_link = NULL;
- }
+ proc_remove(card->proc_root_link);
+ card->proc_root_link = NULL;
if (card->proc_root)
snd_info_disconnect(card->proc_root);
mutex_unlock(&info_mutex);
@@ -856,7 +847,7 @@ static void snd_info_disconnect(struct snd_info_entry *entry)
list_del_init(&entry->list);
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
snd_BUG_ON(!root);
- snd_remove_proc_entry(root, entry->p);
+ proc_remove(entry->p);
entry->p = NULL;
}


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