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crypto: ccp - fix lock acquisition code 

This patch simplifies an unneeded read-write lock.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gary R Hook 2016-03-16 09:02:26 -05:00 committed by Herbert Xu
parent d1558f4e95
commit 03a6f29000
1 changed files with 3 additions and 3 deletions
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6
drivers/crypto/ccp/ccp-dev.c
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@ -53,7 +53,7 @@ static DEFINE_RWLOCK(ccp_unit_lock);
static LIST_HEAD(ccp_units);
/* Round-robin counter */
static DEFINE_RWLOCK(ccp_rr_lock);
static DEFINE_SPINLOCK(ccp_rr_lock);
static struct ccp_device *ccp_rr;
/* Ever-increasing value to produce unique unit numbers */
@ -128,14 +128,14 @@ static struct ccp_device *ccp_get_device(void)
*/
read_lock_irqsave(&ccp_unit_lock, flags);
if (!list_empty(&ccp_units)) {
write_lock_irqsave(&ccp_rr_lock, flags);
spin_lock(&ccp_rr_lock);
dp = ccp_rr;
if (list_is_last(&ccp_rr->entry, &ccp_units))
ccp_rr = list_first_entry(&ccp_units, struct ccp_device,
entry);
else
ccp_rr = list_next_entry(ccp_rr, entry);
write_unlock_irqrestore(&ccp_rr_lock, flags);
spin_unlock(&ccp_rr_lock);
}
read_unlock_irqrestore(&ccp_unit_lock, flags);