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authorNicholas Bellinger <nab@linux-iscsi.org>2016-05-17 22:19:10 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2016-07-20 00:58:38 -0700
commitdff0ca9ea7dc8be2181a62df4a722c32ce68ff4a (patch)
tree5a8fad3a30d78857da00f4be6952c4f16c95f35c /include/target
parentea263c7fada4af8ec7fe5fcfd6e7d7705a89351b (diff)
downloadlinux-stericsson-dff0ca9ea7dc8be2181a62df4a722c32ce68ff4a.tar.gz
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.h1
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);