diff options
Diffstat (limited to 'freebsd/sys/sys/buf_ring.h')
| -rw-r--r-- | freebsd/sys/sys/buf_ring.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/freebsd/sys/sys/buf_ring.h b/freebsd/sys/sys/buf_ring.h index 0b633238..e8c69341 100644 --- a/freebsd/sys/sys/buf_ring.h +++ b/freebsd/sys/sys/buf_ring.h @@ -34,10 +34,6 @@ #include <machine/cpu.h> -#if defined(INVARIANTS) && !defined(DEBUG_BUFRING) -#define DEBUG_BUFRING 1 -#endif - #ifdef DEBUG_BUFRING #include <sys/lock.h> #include <sys/mutex.h> @@ -69,6 +65,12 @@ buf_ring_enqueue(struct buf_ring *br, void *buf) uint32_t prod_head, prod_next, cons_tail; #ifdef DEBUG_BUFRING int i; + + /* + * Note: It is possible to encounter an mbuf that was removed + * via drbr_peek(), and then re-added via drbr_putback() and + * trigger a spurious panic. + */ for (i = br->br_cons_head; i != br->br_prod_head; i = ((i + 1) & br->br_cons_mask)) if(br->br_ring[i] == buf) |