diff options
| author | Divy Le Ray <divy@chelsio.com> | 2010-02-01 10:29:29 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-02-03 18:37:10 -0800 |
| commit | 2e02644abc4b3574533b027782820b5a6dfe1920 (patch) | |
| tree | 8d290370b0147c459970ddf789fe4f6410dbce6e /drivers/net/cxgb3/sge.c | |
| parent | ace2a4d0fbf868c00625a8fd91c44ad9fabe7012 (diff) | |
cxgb3: add memory barriers
Add memory barriers to fix crashes observed on newest PowerPC platforms.
The HW and driver state of the receive rings were getting out of sync.
Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/cxgb3/sge.c')
| -rw-r--r-- | drivers/net/cxgb3/sge.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c index bdbd14727e4b..4cf9b7962afa 100644 --- a/drivers/net/cxgb3/sge.c +++ b/drivers/net/cxgb3/sge.c @@ -480,6 +480,7 @@ static inline void ring_fl_db(struct adapter *adap, struct sge_fl *q) { if (q->pend_cred >= q->credits / 4) { q->pend_cred = 0; + wmb(); t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id)); } } @@ -2282,11 +2283,14 @@ static int process_responses(struct adapter *adap, struct sge_qset *qs, while (likely(budget_left && is_new_response(r, q))) { int packet_complete, eth, ethpad = 2, lro = qs->lro_enabled; struct sk_buff *skb = NULL; - u32 len, flags = ntohl(r->flags); - __be32 rss_hi = *(const __be32 *)r, - rss_lo = r->rss_hdr.rss_hash_val; + u32 len, flags; + __be32 rss_hi, rss_lo; + rmb(); eth = r->rss_hdr.opcode == CPL_RX_PKT; + rss_hi = *(const __be32 *)r; + rss_lo = r->rss_hdr.rss_hash_val; + flags = ntohl(r->flags); if (unlikely(flags & F_RSPD_ASYNC_NOTIF)) { skb = alloc_skb(AN_PKT_SIZE, GFP_ATOMIC); @@ -2497,7 +2501,10 @@ static int process_pure_responses(struct adapter *adap, struct sge_qset *qs, refill_rspq(adap, q, q->credits); q->credits = 0; } - } while (is_new_response(r, q) && is_pure_response(r)); + if (!is_new_response(r, q)) + break; + rmb(); + } while (is_pure_response(r)); if (sleeping) check_ring_db(adap, qs, sleeping); @@ -2531,6 +2538,7 @@ static inline int handle_responses(struct adapter *adap, struct sge_rspq *q) if (!is_new_response(r, q)) return -1; + rmb(); if (is_pure_response(r) && process_pure_responses(adap, qs, r) == 0) { t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | V_NEWTIMER(q->holdoff_tmr) | V_NEWINDEX(q->cidx)); |