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authorNeale Ranns <nranns@cisco.com>2017-01-30 06:44:58 -0800
committerOle Trøan <otroan@employees.org>2017-01-31 12:31:59 +0000
commit05b2bf2e31a90d97425230dcbf2bca6df54519ff (patch)
treef960625681b74ff857e365eac0ddaa3e782282c8 /src/vnet/mfib/mfib_signal.c
parent676112f81e52cd91c88a7ab985e957bd64baafd0 (diff)
MFIB Coverity warnings. The lock macro is functionally equivalent but more expressive (and might appease coverity)
Change-Id: Ie3c9b2896a487a0302903bfbdd6348f6f091c67d Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/mfib/mfib_signal.c')
-rw-r--r--src/vnet/mfib/mfib_signal.c55
1 files changed, 34 insertions, 21 deletions
diff --git a/src/vnet/mfib/mfib_signal.c b/src/vnet/mfib/mfib_signal.c
index 9f6205de419..cd486da32f8 100644
--- a/src/vnet/mfib/mfib_signal.c
+++ b/src/vnet/mfib/mfib_signal.c
@@ -68,6 +68,28 @@ mfib_signal_module_init (void)
mfib_signal_list_init();
}
+static inline void
+mfib_signal_lock_aquire (void)
+{
+ while (__sync_lock_test_and_set (&mfib_signal_pending.mip_lock, 1))
+ ;
+}
+
+static inline void
+mfib_signal_lock_release (void)
+{
+ mfib_signal_pending.mip_lock = 0;
+}
+
+#define MFIB_SIGNAL_CRITICAL_SECTION(_body) \
+{ \
+ mfib_signal_lock_aquire(); \
+ do { \
+ _body; \
+ } while (0); \
+ mfib_signal_lock_release(); \
+}
+
int
mfib_signal_send_one (struct _unix_shared_memory_queue *q,
u32 context)
@@ -77,13 +99,11 @@ mfib_signal_send_one (struct _unix_shared_memory_queue *q,
/*
* with the lock held, pop a signal from the q.
*/
- while (__sync_lock_test_and_set (&mfib_signal_pending.mip_lock, 1))
- ;
- {
+ MFIB_SIGNAL_CRITICAL_SECTION(
+ ({
li = clib_dlist_remove_head(mfib_signal_dlist_pool,
mfib_signal_pending.mip_head);
- }
- mfib_signal_pending.mip_lock = 0;
+ }));
if (~0 != li)
{
@@ -106,13 +126,11 @@ mfib_signal_send_one (struct _unix_shared_memory_queue *q,
/*
* with the lock held, return the resoruces of the signals posted
*/
- while (__sync_lock_test_and_set(&mfib_signal_pending.mip_lock, 1))
- ;
- {
+ MFIB_SIGNAL_CRITICAL_SECTION(
+ ({
pool_put_index(mfib_signal_pool, si);
pool_put_index(mfib_signal_dlist_pool, li);
- }
- mfib_signal_pending.mip_lock = 0;
+ }));
return (1);
}
@@ -128,9 +146,8 @@ mfib_signal_push (const mfib_entry_t *mfe,
dlist_elt_t *elt;
u32 si, li;
- while (__sync_lock_test_and_set (&mfib_signal_pending.mip_lock, 1))
- ;
- {
+ MFIB_SIGNAL_CRITICAL_SECTION(
+ ({
pool_get(mfib_signal_pool, mfs);
pool_get(mfib_signal_dlist_pool, elt);
@@ -143,8 +160,7 @@ mfib_signal_push (const mfib_entry_t *mfe,
clib_dlist_addhead(mfib_signal_dlist_pool,
mfib_signal_pending.mip_head,
li);
- }
- mfib_signal_pending.mip_lock = 0;
+ }));
mfs->mfs_entry = mfib_entry_get_index(mfe);
mfs->mfs_itf = mfib_itf_get_index(mfi);
@@ -179,9 +195,8 @@ mfib_signal_remove_itf (const mfib_itf_t *mfi)
/*
* it's in the pending q
*/
- while (__sync_lock_test_and_set (&mfib_signal_pending.mip_lock, 1))
- ;
- {
+ MFIB_SIGNAL_CRITICAL_SECTION(
+ ({
dlist_elt_t *elt;
/*
@@ -194,8 +209,6 @@ mfib_signal_remove_itf (const mfib_itf_t *mfi)
elt = pool_elt_at_index(mfib_signal_dlist_pool, li);
pool_put_index(mfib_signal_pool, elt->value);
pool_put(mfib_signal_dlist_pool, elt);
- }
-
- mfib_signal_pending.mip_lock = 0;
+ }));
}
}