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Commit 632be194 authored by Hariprasad Shenai's avatar Hariprasad Shenai Committed by David S. Miller
Browse files

cxgb4: Use ACCES_ONCE macro to read queue's consumer index 



Use helper macro ACCESS_ONCE() to load from the SGE status page
to prevent the compiler loading multiple times.

Based on original work by Mike Werner <werner@chelsio.com>

Signed-off-by: default avatarHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b8759e91

drivers/net/ethernet/chelsio/cxgb4/sge.c

+2 −2
Original line number Diff line number Diff line
@@ -406,7 +406,7 @@ static void free_tx_desc(struct adapter *adap, struct sge_txq *q, 
 */

static inline int reclaimable(const struct sge_txq *q)

{

	int hw_cidx = ntohs(q->stat->cidx);

	int hw_cidx = ntohs(ACCESS_ONCE(q->stat->cidx));

	hw_cidx -= q->cidx;

	return hw_cidx < 0 ? hw_cidx + q->size : hw_cidx;

}
@@ -1320,7 +1320,7 @@ out_free: dev_kfree_skb_any(skb); 
 */

static inline void reclaim_completed_tx_imm(struct sge_txq *q)

{

	int hw_cidx = ntohs(q->stat->cidx);

	int hw_cidx = ntohs(ACCESS_ONCE(q->stat->cidx));

	int reclaim = hw_cidx - q->cidx;



	if (reclaim < 0)