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crypto: caam - consolidate memory barriers from job ring en/dequeue

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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>
This commit is contained in:
Kim Phillips 2012-06-22 19:48:56 -05:00 committed by Herbert Xu
parent a8ea07c21d
commit 14a8e29cc2
1 changed files with 2 additions and 6 deletions
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8
drivers/crypto/caam/jr.c
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@ -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);