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| author | Kim Phillips <kim.phillips@freescale.com> | 2012-06-22 19:48:56 -0500 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-06-27 14:42:07 +0800 |
| commit | 14a8e29cc2012394d3e886b11402eabd49a4d609 (patch) | |
| tree | 9852a7f7c4674b1331c7e2f87a47d5119600a0a9 /drivers/crypto | |
| parent | a8ea07c21d40cf17dd9cbe3cbf87d477b26c354f (diff) | |
| download | op-kernel-dev-14a8e29cc2012394d3e886b11402eabd49a4d609.zip op-kernel-dev-14a8e29cc2012394d3e886b11402eabd49a4d609.tar.gz | |
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>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/caam/jr.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index 7ae5e51..0adaad1 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); |
