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    Subject[ 139/171] libceph: prevent the race of incoming work during teardown
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Guanjun He <gjhe@suse.com>

    (cherry picked from commit a2a3258417eb6a1799cf893350771428875a8287)

    Add an atomic variable 'stopping' as flag in struct ceph_messenger,
    set this flag to 1 in function ceph_destroy_client(), and add the condition code
    in function ceph_data_ready() to test the flag value, if true(1), just return.

    Signed-off-by: Guanjun He <gjhe@suse.com>
    Reviewed-by: Sage Weil <sage@inktank.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/linux/ceph/messenger.h | 1 +
    net/ceph/ceph_common.c | 2 ++
    net/ceph/messenger.c | 5 +++++
    3 files changed, 8 insertions(+)

    --- a/include/linux/ceph/messenger.h
    +++ b/include/linux/ceph/messenger.h
    @@ -50,6 +50,7 @@ struct ceph_messenger {
    struct ceph_entity_inst inst; /* my name+address */
    struct ceph_entity_addr my_enc_addr;

    + atomic_t stopping;
    bool nocrc;

    /*
    --- a/net/ceph/ceph_common.c
    +++ b/net/ceph/ceph_common.c
    @@ -495,6 +495,8 @@ void ceph_destroy_client(struct ceph_cli
    {
    dout("destroy_client %p\n", client);

    + atomic_set(&client->msgr.stopping, 1);
    +
    /* unmount */
    ceph_osdc_stop(&client->osdc);

    --- a/net/ceph/messenger.c
    +++ b/net/ceph/messenger.c
    @@ -254,6 +254,9 @@ static void con_sock_state_closed(struct
    static void ceph_sock_data_ready(struct sock *sk, int count_unused)
    {
    struct ceph_connection *con = sk->sk_user_data;
    + if (atomic_read(&con->msgr->stopping)) {
    + return;
    + }

    if (sk->sk_state != TCP_CLOSE_WAIT) {
    dout("%s on %p state = %lu, queueing work\n", __func__,
    @@ -2413,6 +2416,8 @@ void ceph_messenger_init(struct ceph_mes
    encode_my_addr(msgr);
    msgr->nocrc = nocrc;

    + atomic_set(&msgr->stopping, 0);
    +
    dout("%s %p\n", __func__, msgr);
    }
    EXPORT_SYMBOL(ceph_messenger_init);



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