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| author | Sage Weil <sage@inktank.com> | 2012-07-31 03:17:13 +0200 |
|---|---|---|
| committer | Sage Weil <sage@inktank.com> | 2012-07-31 03:17:13 +0200 |
| commit | 8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a (patch) | |
| tree | 9fdb08cf293f181c566c830dadccf8d176ef2184 /net | |
| parent | libceph: verify state after retaking con lock after dispatch (diff) | |
| download | linux-8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a.tar.xz linux-8636ea672f0c5ab7478c42c5b6705ebd1db7eb6a.zip | |
libceph: avoid dropping con mutex before fault
The ceph_fault() function takes the con mutex, so we should avoid
dropping it before calling it. This fixes a potential race with
another thread calling ceph_con_close(), or _open(), or similar (we
don't reverify con->state after retaking the lock).
Add annotation so that lockdep realizes we will drop the mutex before
returning.
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ceph/messenger.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index feb5a2ac724c..c3b628c76194 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2336,7 +2336,6 @@ done_unlocked: return; fault: - mutex_unlock(&con->mutex); ceph_fault(con); /* error/fault path */ goto done_unlocked; } @@ -2347,9 +2346,8 @@ fault: * exponential backoff */ static void ceph_fault(struct ceph_connection *con) + __releases(con->mutex) { - mutex_lock(&con->mutex); - pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); dout("fault %p state %lu to peer %s\n", |