diff options
| author |   Nicholas Bellinger <nab@linux-iscsi.org> | 2016-05-17 22:19:10 -0700 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2016-07-20 00:58:38 -0700 |
| commit | dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a (patch) | |
| tree | 5a8fad3a30d78857da00f4be6952c4f16c95f35c /include/target | |
| parent | target: Fix max_unmap_lba_count calc overflow (diff) | |
| download | linux-dev-dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a.tar.xz linux-dev-dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a.zip | |
target: Fix ordered task target_setup_cmd_from_cdb exception hang
If a command with a Simple task attribute is failed due to a Unit
Attention, then a subsequent command with an Ordered task attribute
will hang forever. The reason for this is that the Unit Attention
status is checked for in target_setup_cmd_from_cdb, before the call
to target_execute_cmd, which calls target_handle_task_attr, which
in turn increments dev->simple_cmds.
However, transport_generic_request_failure still calls
transport_complete_task_attr, which will decrement dev->simple_cmds.
In this case, simple_cmds is now -1. So when a command with the
Ordered task attribute is sent, target_handle_task_attr sees that
dev->simple_cmds is not 0, so it decides it can't execute the
command until all the (nonexistent) Simple commands have completed.
Reported-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Tested-by: Michael Cyr <mikecyr@linux.vnet.ibm.com>
Reported-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Tested-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
| -rw-r--r-- | include/target/target_core_fabric.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h index de44462a7680..5cd6faa6e0d1 100644 --- a/include/target/target_core_fabric.h +++ b/include/target/target_core_fabric.h @@ -163,7 +163,6 @@ int core_tmr_alloc_req(struct se_cmd *, void *, u8, gfp_t); void core_tmr_release_req(struct se_tmr_req *); int transport_generic_handle_tmr(struct se_cmd *); void transport_generic_request_failure(struct se_cmd *, sense_reason_t); -void __target_execute_cmd(struct se_cmd *); int transport_lookup_tmr_lun(struct se_cmd *, u64); void core_allocate_nexus_loss_ua(struct se_node_acl *acl); |