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Subject[PATCH 3.13 203/212] iser-target: Add missing target_put_sess_cmd for ImmedateData failure
Date
3.13.11.4 -stable review patch.  If anyone has any objections, please let me know.

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

From: Nicholas Bellinger <nab@linux-iscsi.org>

commit 6cc44a6fb46e1ecc1c28125aa8fa34d317aa9ea7 upstream.

This patch addresses a bug where an early exception for SCSI WRITE
with ImmediateData=Yes was missing the target_put_sess_cmd() call
to drop the extra se_cmd->cmd_kref reference obtained during the
normal iscsit_setup_scsi_cmd() codepath execution.

This bug was manifesting itself during session shutdown within
isert_cq_rx_comp_err() where target_wait_for_sess_cmds() would
end up waiting indefinately for the last se_cmd->cmd_kref put to
occur for the failed SCSI WRITE + ImmediateData descriptors.

This fix follows what traditional iscsi-target code already does
for the same failure case within iscsit_get_immediate_data().

Reported-by: Sagi Grimberg <sagig@dev.mellanox.co.il>
Cc: Sagi Grimberg <sagig@dev.mellanox.co.il>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
drivers/infiniband/ulp/isert/ib_isert.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 0169850..8ed268d 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -1095,6 +1095,8 @@ sequence_cmd:

if (!rc && dump_payload == false && unsol_data)
iscsit_set_unsoliticed_dataout(cmd);
+ else if (dump_payload && imm_data)
+ target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);

return 0;
}
--
1.9.1


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