| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 16 Apr 2008 14:27:26 -0400
From: Allan Stephens <allan.stephens@...driver.com>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, allan.stephens@...driver.com
Subject: [PATCH 3/3 net-2.6.26] [TIPC]: Cleanup of TIPC reference table code
This patch is a largely cosmetic cleanup of the TIPC reference
table code.
- The object reference field in each table entry is now single
32-bit integer instead of a union of two 32-bit integers.
- Variable naming has been made more consistent.
- Error message output has been made more consistent.
- Useless #includes have been eliminated.
Signed-off-by: Allan Stephens <allan.stephens@...driver.com>
---
net/tipc/ref.c | 81 +++++++++++++++++++++++--------------------------------
1 files changed, 34 insertions(+), 47 deletions(-)
diff --git a/net/tipc/ref.c b/net/tipc/ref.c
index 1853cca..89cbab2 100644
--- a/net/tipc/ref.c
+++ b/net/tipc/ref.c
@@ -36,30 +36,18 @@
#include "core.h"
#include "ref.h"
-#include "port.h"
-#include "subscr.h"
-#include "name_distr.h"
-#include "name_table.h"
-#include "config.h"
-#include "discover.h"
-#include "bearer.h"
-#include "node.h"
-#include "bcast.h"
/**
* struct reference - TIPC object reference entry
* @object: pointer to object associated with reference entry
* @lock: spinlock controlling access to object
- * @data: reference value for object (combines instance & array index info)
+ * @ref: reference value for object (combines instance & array index info)
*/
struct reference {
void *object;
spinlock_t lock;
- union {
- u32 next_plus_upper;
- u32 reference;
- } data;
+ u32 ref;
};
/**
@@ -165,7 +153,7 @@ u32 tipc_ref_acquire(void *object, spinlock_t **lock)
u32 index;
u32 index_mask;
u32 next_plus_upper;
- u32 reference;
+ u32 ref;
if (!object) {
err("Attempt to acquire reference to non-existent object\n");
@@ -185,10 +173,10 @@ u32 tipc_ref_acquire(void *object, spinlock_t **lock)
index_mask = tipc_ref_table.index_mask;
/* take lock in case a previous user of entry still holds it */
spin_lock_bh(&entry->lock);
- next_plus_upper = entry->data.next_plus_upper;
+ next_plus_upper = entry->ref;
tipc_ref_table.first_free = next_plus_upper & index_mask;
- reference = (next_plus_upper & ~index_mask) + index;
- entry->data.reference = reference;
+ ref = (next_plus_upper & ~index_mask) + index;
+ entry->ref = ref;
entry->object = object;
spin_unlock_bh(&entry->lock);
*lock = &entry->lock;
@@ -197,17 +185,17 @@ u32 tipc_ref_acquire(void *object, spinlock_t **lock)
index = tipc_ref_table.init_point++;
entry = &(tipc_ref_table.entries[index]);
spin_lock_init(&entry->lock);
- reference = tipc_ref_table.start_mask + index;
- entry->data.reference = reference;
+ ref = tipc_ref_table.start_mask + index;
+ entry->ref = ref;
entry->object = object;
*lock = &entry->lock;
}
else {
- reference = 0;
+ ref = 0;
}
write_unlock_bh(&ref_table_lock);
- return reference;
+ return ref;
}
/**
@@ -238,26 +226,25 @@ void tipc_ref_discard(u32 ref)
err("Attempt to discard reference to non-existent object\n");
goto exit;
}
- if (entry->data.reference != ref) {
+ if (entry->ref != ref) {
err("Attempt to discard non-existent reference\n");
goto exit;
}
/*
- * mark entry as unused; increment upper bits of entry's data field
+ * mark entry as unused; increment instance part of entry's reference
* to invalidate any subsequent references
*/
entry->object = NULL;
- entry->data.next_plus_upper = (ref & ~index_mask) + (index_mask + 1);
+ entry->ref = (ref & ~index_mask) + (index_mask + 1);
/* append entry to free entry list */
if (tipc_ref_table.first_free == 0)
tipc_ref_table.first_free = index;
else
- tipc_ref_table.entries[tipc_ref_table.last_free].
- data.next_plus_upper |= index;
+ tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
tipc_ref_table.last_free = index;
exit:
@@ -271,15 +258,15 @@ exit:
void *tipc_ref_lock(u32 ref)
{
if (likely(tipc_ref_table.entries)) {
- struct reference *r;
-
- r = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
-
- if (likely(r->data.reference != 0)) {
- spin_lock_bh(&r->lock);
- if (likely((r->data.reference == ref) && (r->object)))
- return r->object;
- spin_unlock_bh(&r->lock);
+ struct reference *entry;
+
+ entry = &tipc_ref_table.entries[ref &
+ tipc_ref_table.index_mask];
+ if (likely(entry->ref != 0)) {
+ spin_lock_bh(&entry->lock);
+ if (likely((entry->ref == ref) && (entry->object)))
+ return entry->object;
+ spin_unlock_bh(&entry->lock);
}
}
return NULL;
@@ -292,15 +279,14 @@ void *tipc_ref_lock(u32 ref)
void tipc_ref_unlock(u32 ref)
{
if (likely(tipc_ref_table.entries)) {
- struct reference *r;
-
- r = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
+ struct reference *entry;
- if (likely((r->data.reference == ref) && (r->object)))
- spin_unlock_bh(&r->lock);
+ entry = &tipc_ref_table.entries[ref &
+ tipc_ref_table.index_mask];
+ if (likely((entry->ref == ref) && (entry->object)))
+ spin_unlock_bh(&entry->lock);
else
- err("tipc_ref_unlock() invoked using "
- "invalid reference\n");
+ err("Attempt to unlock non-existent reference\n");
}
}
@@ -311,11 +297,12 @@ void tipc_ref_unlock(u32 ref)
void *tipc_ref_deref(u32 ref)
{
if (likely(tipc_ref_table.entries)) {
- struct reference *r;
+ struct reference *entry;
- r = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
- if (likely(r->data.reference == ref))
- return r->object;
+ entry = &tipc_ref_table.entries[ref &
+ tipc_ref_table.index_mask];
+ if (likely(entry->ref == ref))
+ return entry->object;
}
return NULL;
}
--
1.5.3.2
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists