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authorNicholas Bellinger <nab@linux-iscsi.org>2012-01-20 19:02:56 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2012-02-07 06:47:11 +0000
commit735703cac08f34a197e1c6331ca9adc8a52d6046 (patch)
tree93e3e09572f681f9f3a360832ba4a84a6f99018e /drivers/target
parent1edcdb497ef418122cd4f98e157660cf594b345a (diff)
downloadop-kernel-dev-735703cac08f34a197e1c6331ca9adc8a52d6046.zip
op-kernel-dev-735703cac08f34a197e1c6331ca9adc8a52d6046.tar.gz
target: Fix target_submit_cmd() exception handling
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>
Diffstat (limited to 'drivers/target')
-rw-r--r--drivers/target/target_core_transport.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index aace7ee..799b5ef 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -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);
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