From 14a8e29cc2012394d3e886b11402eabd49a4d609 Mon Sep 17 00:00:00 2001 From: Kim Phillips <kim.phillips@freescale.com> Date: Fri, 22 Jun 2012 19:48:56 -0500 Subject: crypto: caam - consolidate memory barriers from job ring en/dequeue Memory barriers are implied by the i/o register write implementation (at least on Power). So we can remove the redundant wmb() in caam_jr_enqueue, and, in dequeue(), hoist the h/w done notification write up to before we need to increment the head of the ring, and save an smp_mb. Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> --- drivers/crypto/caam/jr.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index 7ae5e51a0597..0adaad1b8cf7 100644 --- a/drivers/crypto/caam/jr.c +++ b/drivers/crypto/caam/jr.c @@ -94,7 +94,8 @@ static void caam_jr_dequeue(unsigned long devarg) userdesc = jrp->entinfo[sw_idx].desc_addr_virt; userstatus = jrp->outring[hw_idx].jrstatus; - smp_mb(); + /* set done */ + wr_reg32(&jrp->rregs->outring_rmvd, 1); jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) & (JOBR_DEPTH - 1); @@ -114,9 +115,6 @@ static void caam_jr_dequeue(unsigned long devarg) jrp->tail = tail; } - /* set done */ - wr_reg32(&jrp->rregs->outring_rmvd, 1); - spin_unlock_bh(&jrp->outlock); /* Finally, execute user's callback */ @@ -265,8 +263,6 @@ int caam_jr_enqueue(struct device *dev, u32 *desc, (JOBR_DEPTH - 1); jrp->head = (head + 1) & (JOBR_DEPTH - 1); - wmb(); - wr_reg32(&jrp->rregs->inpring_jobadd, 1); spin_unlock(&jrp->inplock); -- cgit v1.2.3