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Message-ID: <20100217182859.3a4f30de@nehalam>
Date: Wed, 17 Feb 2010 18:28:59 -0800
From: Stephen Hemminger <shemminger@...tta.com>
To: David Miller <davem@...emloft.net>,
YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@...ux-ipv6.org>
Cc: netdev@...r.kernel.org
Subject: [PATCH] IPv6: convert mc_lock to spinlock
Only used for writing, so convert to spinlock
Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
--- a/include/net/if_inet6.h 2010-02-17 17:31:40.353868234 -0800
+++ b/include/net/if_inet6.h 2010-02-17 17:31:57.069744558 -0800
@@ -156,7 +156,7 @@ struct inet6_dev {
struct ifmcaddr6 *mc_list;
struct ifmcaddr6 *mc_tomb;
- rwlock_t mc_lock;
+ spinlock_t mc_lock;
unsigned char mc_qrv;
unsigned char mc_gq_running;
unsigned char mc_ifc_count;
--- a/net/ipv6/mcast.c 2010-02-17 17:32:25.486242516 -0800
+++ b/net/ipv6/mcast.c 2010-02-17 17:36:08.025743316 -0800
@@ -793,10 +793,10 @@ static void mld_add_delrec(struct inet6_
}
spin_unlock_bh(&im->mca_lock);
- write_lock_bh(&idev->mc_lock);
+ spin_lock_bh(&idev->mc_lock);
pmc->next = idev->mc_tomb;
idev->mc_tomb = pmc;
- write_unlock_bh(&idev->mc_lock);
+ spin_unlock_bh(&idev->mc_lock);
}
static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
@@ -804,7 +804,7 @@ static void mld_del_delrec(struct inet6_
struct ifmcaddr6 *pmc, *pmc_prev;
struct ip6_sf_list *psf, *psf_next;
- write_lock_bh(&idev->mc_lock);
+ spin_lock_bh(&idev->mc_lock);
pmc_prev = NULL;
for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
if (ipv6_addr_equal(&pmc->mca_addr, pmca))
@@ -817,7 +817,8 @@ static void mld_del_delrec(struct inet6_
else
idev->mc_tomb = pmc->next;
}
- write_unlock_bh(&idev->mc_lock);
+ spin_unlock_bh(&idev->mc_lock);
+
if (pmc) {
for (psf=pmc->mca_tomb; psf; psf=psf_next) {
psf_next = psf->sf_next;
@@ -832,10 +833,10 @@ static void mld_clear_delrec(struct inet
{
struct ifmcaddr6 *pmc, *nextpmc;
- write_lock_bh(&idev->mc_lock);
+ spin_lock_bh(&idev->mc_lock);
pmc = idev->mc_tomb;
idev->mc_tomb = NULL;
- write_unlock_bh(&idev->mc_lock);
+ spin_unlock_bh(&idev->mc_lock);
for (; pmc; pmc = nextpmc) {
nextpmc = pmc->next;
@@ -1696,7 +1697,7 @@ static void mld_send_cr(struct inet6_dev
int type, dtype;
read_lock_bh(&idev->lock);
- write_lock_bh(&idev->mc_lock);
+ spin_lock(&idev->mc_lock);
/* deleted MCA's */
pmc_prev = NULL;
@@ -1730,7 +1731,7 @@ static void mld_send_cr(struct inet6_dev
} else
pmc_prev = pmc;
}
- write_unlock_bh(&idev->mc_lock);
+ spin_unlock(&idev->mc_lock);
/* change recs */
for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
@@ -2311,7 +2312,7 @@ void ipv6_mc_up(struct inet6_dev *idev)
void ipv6_mc_init_dev(struct inet6_dev *idev)
{
write_lock_bh(&idev->lock);
- rwlock_init(&idev->mc_lock);
+ spin_lock_init(&idev->mc_lock);
idev->mc_gq_running = 0;
setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
(unsigned long)idev);
--
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