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author | jlemon <jlemon@FreeBSD.org> | 2000-11-25 07:35:38 +0000 |
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committer | jlemon <jlemon@FreeBSD.org> | 2000-11-25 07:35:38 +0000 |
commit | 954e1d2ccdb661d5c8b7f69340d118fa7ba7fb85 (patch) | |
tree | 0a4e9f6dcd5fa64a78f5991ac425f3ca97aba154 /sys/netatm/atm_device.c | |
parent | 2daca11cae375091daf49a7cd704e5e4e1be27db (diff) | |
download | FreeBSD-src-954e1d2ccdb661d5c8b7f69340d118fa7ba7fb85.zip FreeBSD-src-954e1d2ccdb661d5c8b7f69340d118fa7ba7fb85.tar.gz |
Lock down the network interface queues. The queue mutex must be obtained
before adding/removing packets from the queue. Also, the if_obytes and
if_omcasts fields should only be manipulated under protection of the mutex.
IF_ENQUEUE, IF_PREPEND, and IF_DEQUEUE perform all necessary locking on
the queue. An IF_LOCK macro is provided, as well as the old (mutex-less)
versions of the macros in the form _IF_ENQUEUE, _IF_QFULL, for code which
needs them, but their use is discouraged.
Two new macros are introduced: IF_DRAIN() to drain a queue, and IF_HANDOFF,
which takes care of locking/enqueue, and also statistics updating/start
if necessary.
Diffstat (limited to 'sys/netatm/atm_device.c')
-rw-r--r-- | sys/netatm/atm_device.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/netatm/atm_device.c b/sys/netatm/atm_device.c index e458bf4..ecca8ad 100644 --- a/sys/netatm/atm_device.c +++ b/sys/netatm/atm_device.c @@ -314,6 +314,7 @@ atm_dev_lower(cmd, tok, arg1, arg2) * Free any buffers from this VCC on the ATM interrupt queue */ prev = NULL; + IF_LOCK(&atm_intrq); for (m = atm_intrq.ifq_head; m; m = next) { next = KB_QNEXT(m); @@ -344,6 +345,7 @@ atm_dev_lower(cmd, tok, arg1, arg2) prev = m; } } + IF_UNLOCK(&atm_intrq); (void) splx(s); /* |