diff options
| author | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-06-13 22:58:09 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-20 18:09:26 +0200 |
| commit | f5ba9a6e48bfb2b00a912a648b69063501637ed3 (patch) | |
| tree | 259642802230f4d1dd8173c44f76d21cd41af275 /drivers/target | |
| parent | 51d841908029ff6b892a93e4df8175162ca8dcc8 (diff) | |
target: Fix ordered task CHECK_CONDITION early exception handling
commit 410c29dfbfdf73d0d0b5d14a21868ab038eca703 upstream.
If a Simple command is sent with a failure, target_setup_cmd_from_cdb
returns with TCM_UNSUPPORTED_SCSI_OPCODE or TCM_INVALID_CDB_FIELD.
So in the cases where target_setup_cmd_from_cdb returns an error, we
never get far enough to call target_execute_cmd to increment simple_cmds.
Since simple_cmds isn't incremented, the result of the failure from
target_setup_cmd_from_cdb causes transport_generic_request_failure to
decrement simple_cmds, due to call to transport_complete_task_attr.
With this dev->simple_cmds or dev->dev_ordered_sync is now -1, not 0.
So when a subsequent command with an Ordered Task is sent, it causes
a hang, since dev->simple_cmds is at -1.
Tested-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Tested-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Signed-off-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_transport.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 8bd7bf6cd986..7bc3778a1ac9 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1815,6 +1815,8 @@ static bool target_handle_task_attr(struct se_cmd *cmd) if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) return false; + cmd->se_cmd_flags |= SCF_TASK_ATTR_SET; + /* * Check for the existence of HEAD_OF_QUEUE, and if true return 1 * to allow the passed struct se_cmd list of tasks to the front of the list. @@ -1937,6 +1939,9 @@ static void transport_complete_task_attr(struct se_cmd *cmd) if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH) return; + if (!(cmd->se_cmd_flags & SCF_TASK_ATTR_SET)) + goto restart; + if (cmd->sam_task_attr == TCM_SIMPLE_TAG) { atomic_dec_mb(&dev->simple_cmds); dev->dev_cur_ordered_id++; @@ -1953,7 +1958,7 @@ static void transport_complete_task_attr(struct se_cmd *cmd) pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED\n", dev->dev_cur_ordered_id); } - +restart: target_restart_delayed_cmds(dev); } |