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target: Fix target_submit_cmd() exception handling

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This patch fixes a bug in target_submit_cmd() where the failure path
for transport_generic_allocate_tasks() made a direct call to
transport_send_check_condition_and_sense() and not calling the
final target_put_sess_cmd() release callback.

For transport_generic_allocate_tasks() failures, use the proper call to
transport_generic_request_failure() to handle kref_put() along
with potential internal queue full response processing.

It also makes transport_lookup_cmd_lun() failures in
target_submit_cmd() use transport_send_check_condition_and_sense() and
target_put_sess_cmd() directly to avoid se_cmd->se_dev reference in
transport_generic_request_failure() handling.

Finally it drops the out_check_cond: label and use direct reference for
allocate task failures, and per-se_device queue_full handling is
currently not supported for transport_lookup_cmd_lun() failure
descriptors due to se_device dependency.

Reported-by: Roland Dreier <roland@purestorage.com>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2012-01-20 19:02:56 -08:00
parent 1edcdb497e
commit 735703cac0
1 changed files with 10 additions and 8 deletions
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18
drivers/target/target_core_transport.c
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@ -1690,15 +1690,21 @@ void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
/*
* Locate se_lun pointer and attach it to struct se_cmd
*/
if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0)
goto out_check_cond;
if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
target_put_sess_cmd(se_sess, se_cmd);
return;
}
/*
* Sanitize CDBs via transport_generic_cmd_sequencer() and
* allocate the necessary tasks to complete the received CDB+data
*/
rc = transport_generic_allocate_tasks(se_cmd, cdb);
if (rc != 0)
goto out_check_cond;
if (rc != 0) {
transport_generic_request_failure(se_cmd);
return;
}
/*
* Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
* for immediate execution of READs, otherwise wait for
@ -1707,10 +1713,6 @@ void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
*/
transport_handle_cdb_direct(se_cmd);
return;
out_check_cond:
transport_send_check_condition_and_sense(se_cmd,
se_cmd->scsi_sense_reason, 0);
}
EXPORT_SYMBOL(target_submit_cmd);