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| author | Liang Zhen <liang.zhen@intel.com> | 2016-03-03 00:53:26 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-03 01:01:38 +0100 |
| commit | 992f0b226e4e49c9c3daccc19418cb2fdf2be1cf (patch) | |
| tree | 71ac8089bc8ba96ef7fd83d869493ae5f7e1e7d4 | |
| parent | staging: lustre: make ko2iblnd connect parameters persistent (diff) | |
| download | linux-992f0b226e4e49c9c3daccc19418cb2fdf2be1cf.tar.xz linux-992f0b226e4e49c9c3daccc19418cb2fdf2be1cf.zip | |
staging: lustre: take extra refcount in kiblnd_connreq_done
refcount taken by cmid is not reliable after kiblnd_connreq_done
released the glock because this connection is visible to other
threads, another thread can find and close this connection right
after kiblnd_connreq_done released the glock, if kiblnd_cm_callback
for RDMA_CM_EVENT_DISCONNECTED is called, it can release the
connection refcount taken by cmid. It means the connection could be
destroyed before kiblnd_connreq_done() finish operations on it.
Signed-off-by: Liang Zhen <liang.zhen@intel.com>
ntel-bug-id: https://jira.hpdd.intel.com/browse/LU-7210
Reviewed-on: http://review.whamcloud.com/17527
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c index 6c8f09ee489d..f76c57074529 100644 --- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c +++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c @@ -939,8 +939,6 @@ kiblnd_check_sends(kib_conn_t *conn) kiblnd_queue_tx_locked(tx, conn); } - kiblnd_conn_addref(conn); /* 1 ref for me.... (see b21911) */ - for (;;) { int credit; @@ -966,8 +964,6 @@ kiblnd_check_sends(kib_conn_t *conn) } spin_unlock(&conn->ibc_lock); - - kiblnd_conn_decref(conn); /* ...until here */ } static void @@ -2131,6 +2127,16 @@ kiblnd_connreq_done(kib_conn_t *conn, int status) return; } + /** + * refcount taken by cmid is not reliable after I released the glock + * because this connection is visible to other threads now, another + * thread can find and close this connection right after I released + * the glock, if kiblnd_cm_callback for RDMA_CM_EVENT_DISCONNECTED is + * called, it can release the connection refcount taken by cmid. + * It means the connection could be destroyed before I finish my + * operations on it. + */ + kiblnd_conn_addref(conn); write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags); /* Schedule blocked txs */ @@ -2146,6 +2152,8 @@ kiblnd_connreq_done(kib_conn_t *conn, int status) /* schedule blocked rxs */ kiblnd_handle_early_rxs(conn); + + kiblnd_conn_decref(conn); } static void |