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    Subject[PATCH-v2 5/9] target: Avoid non-existent tg_pt_gp_mem in target_alua_state_check
    Date
    From: Nicholas Bellinger <nab@daterainc.com>

    This patch adds an check for a non-existent port->sep_alua_tg_pt_gp_mem
    within target_alua_state_check(), which is not present for internally
    dispatched EXTENDED_COPY WRITE I/O to the destination target port.

    Cc: Christoph Hellwig <hch@lst.de>
    Cc: Hannes Reinecke <hare@suse.de>
    Cc: Martin Petersen <martin.petersen@oracle.com>
    Cc: Chris Mason <chris.mason@fusionio.com>
    Cc: Roland Dreier <roland@purestorage.com>
    Cc: Zach Brown <zab@redhat.com>
    Cc: James Bottomley <JBottomley@Parallels.com>
    Cc: Nicholas Bellinger <nab@linux-iscsi.org>
    Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
    ---
    drivers/target/target_core_alua.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
    index 5403186..ea928c4 100644
    --- a/drivers/target/target_core_alua.c
    +++ b/drivers/target/target_core_alua.c
    @@ -557,6 +557,9 @@ target_alua_state_check(struct se_cmd *cmd)
    * a ALUA logical unit group.
    */
    tg_pt_gp_mem = port->sep_alua_tg_pt_gp_mem;
    + if (!tg_pt_gp_mem)
    + return 0;
    +
    spin_lock(&tg_pt_gp_mem->tg_pt_gp_mem_lock);
    tg_pt_gp = tg_pt_gp_mem->tg_pt_gp;
    out_alua_state = atomic_read(&tg_pt_gp->tg_pt_gp_alua_access_state);
    --
    1.7.2.5


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