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authorNicholas Bellinger <nab@linux-iscsi.org>2016-01-19 15:23:02 -0800
committerNicholas Bellinger <nab@linux-iscsi.org>2016-02-05 15:40:34 -0800
commit0f4a943168f31d29a1701908931acaba518b131a (patch)
tree00f4e66a05f284df16775d392ae8e8084cfa4953 /include/target
parentebde1ca5a908b10312db4ecd7553e3ba039319ab (diff)
downloadlinux-stericsson-0f4a943168f31d29a1701908931acaba518b131a.tar.gz
target: Fix remote-port TMR ABORT + se_cmd fabric stop
To address the bug where fabric driver level shutdown of se_cmd occurs at the same time when TMR CMD_T_ABORTED is happening resulting in a -1 ->cmd_kref, this patch adds a CMD_T_FABRIC_STOP bit that is used to determine when TMR + driver I_T nexus shutdown is happening concurrently. It changes target_sess_cmd_list_set_waiting() to obtain se_cmd->cmd_kref + set CMD_T_FABRIC_STOP, and drop local reference in target_wait_for_sess_cmds() and invoke extra target_put_sess_cmd() during Task Aborted Status (TAS) when necessary. Also, it adds a new target_wait_free_cmd() wrapper around transport_wait_for_tasks() for the special case within transport_generic_free_cmd() to set CMD_T_FABRIC_STOP, and is now aware of CMD_T_ABORTED + CMD_T_TAS status bits to know when an extra transport_put_cmd() during TAS is required. Note transport_generic_free_cmd() is expected to block on cmd->cmd_wait_comp in order to follow what iscsi-target expects during iscsi_conn context se_cmd shutdown. Cc: Quinn Tran <quinn.tran@qlogic.com> Cc: Himanshu Madhani <himanshu.madhani@qlogic.com> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Andy Grover <agrover@redhat.com> Cc: Mike Christie <mchristi@redhat.com> Cc: stable@vger.kernel.org # 3.10+ Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_base.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 1a76726c45a2..1579539e5669 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -493,6 +493,8 @@ struct se_cmd {
#define CMD_T_DEV_ACTIVE (1 << 7)
#define CMD_T_REQUEST_STOP (1 << 8)
#define CMD_T_BUSY (1 << 9)
+#define CMD_T_TAS (1 << 10)
+#define CMD_T_FABRIC_STOP (1 << 11)
spinlock_t t_state_lock;
struct kref cmd_kref;
struct completion t_transport_stop_comp;