diff options
| author | Taehee Yoo <ap420073@gmail.com> | 2021-03-25 16:16:52 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-26 15:14:55 -0700 |
| commit | cf2ce339b401bc53ee131f0ce38bae32a949925e (patch) | |
| tree | 7f7528820bbb5ce295f1d085d8cc327afe669eb0 /net/ipv6/mcast.c | |
| parent | 2d9a93b4902be6a5504b5941dd15e9cd776aadca (diff) | |
mld: get rid of inet6_dev->mc_lock
The purpose of mc_lock is to protect inet6_dev->mc_tomb.
But mc_tomb is already protected by RTNL and all functions,
which manipulate mc_tomb are called under RTNL.
So, mc_lock is not needed.
Furthermore, it is spinlock so the critical section is atomic.
In order to reduce atomic context, it should be removed.
Suggested-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/mcast.c')
| -rw-r--r-- | net/ipv6/mcast.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 692a6dec8959..35962aa3cc22 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -752,10 +752,8 @@ static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) } spin_unlock_bh(&im->mca_lock); - spin_lock_bh(&idev->mc_lock); pmc->next = idev->mc_tomb; idev->mc_tomb = pmc; - spin_unlock_bh(&idev->mc_lock); } static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) @@ -764,7 +762,6 @@ static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) struct ip6_sf_list *psf; struct in6_addr *pmca = &im->mca_addr; - 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)) @@ -777,7 +774,6 @@ static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) else idev->mc_tomb = pmc->next; } - spin_unlock_bh(&idev->mc_lock); spin_lock_bh(&im->mca_lock); if (pmc) { @@ -801,10 +797,8 @@ static void mld_clear_delrec(struct inet6_dev *idev) { struct ifmcaddr6 *pmc, *nextpmc; - spin_lock_bh(&idev->mc_lock); pmc = idev->mc_tomb; idev->mc_tomb = NULL; - spin_unlock_bh(&idev->mc_lock); for (; pmc; pmc = nextpmc) { nextpmc = pmc->next; @@ -1907,7 +1901,6 @@ static void mld_send_cr(struct inet6_dev *idev) int type, dtype; read_lock_bh(&idev->lock); - spin_lock(&idev->mc_lock); /* deleted MCA's */ pmc_prev = NULL; @@ -1941,7 +1934,6 @@ static void mld_send_cr(struct inet6_dev *idev) } else pmc_prev = pmc; } - spin_unlock(&idev->mc_lock); /* change recs */ for (pmc = idev->mc_list; pmc; pmc = pmc->next) { @@ -2582,7 +2574,6 @@ void ipv6_mc_up(struct inet6_dev *idev) void ipv6_mc_init_dev(struct inet6_dev *idev) { write_lock_bh(&idev->lock); - spin_lock_init(&idev->mc_lock); idev->mc_gq_running = 0; INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work); idev->mc_tomb = NULL; |