| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 53/77] target: Use complete_all for se_cmd->t_transport_stop_comp | Date | Sat, 28 Jun 2014 10:46:46 -0700 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Bellinger <nab@linux-iscsi.org>
commit a95d6511303b848da45ee27b35018bb58087bdc6 upstream.
This patch fixes a bug where multiple waiters on ->t_transport_stop_comp occurs due to a concurrent ABORT_TASK and session reset both invoking transport_wait_for_tasks(), while waiting for the associated se_cmd descriptor backend processing to complete.
For this case, complete_all() should be invoked in order to wake up both waiters in core_tmr_abort_task() + transport_generic_free_cmd() process contexts.
Cc: Thomas Glanzmann <thomas@glanzmann.de> Cc: Charalampos Pournaris <charpour@gmail.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/target/target_core_transport.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -488,7 +488,7 @@ static int transport_cmd_check_stop(stru spin_unlock_irqrestore(&cmd->t_state_lock, flags); - complete(&cmd->t_transport_stop_comp); + complete_all(&cmd->t_transport_stop_comp); return 1; } @@ -617,7 +617,7 @@ void target_complete_cmd(struct se_cmd * if (cmd->transport_state & CMD_T_ABORTED && cmd->transport_state & CMD_T_STOP) { spin_unlock_irqrestore(&cmd->t_state_lock, flags); - complete(&cmd->t_transport_stop_comp); + complete_all(&cmd->t_transport_stop_comp); return; } else if (cmd->transport_state & CMD_T_FAILED) { INIT_WORK(&cmd->work, target_complete_failure_work); @@ -1688,7 +1688,7 @@ void target_execute_cmd(struct se_cmd *c cmd->se_tfo->get_task_tag(cmd)); spin_unlock_irq(&cmd->t_state_lock); - complete(&cmd->t_transport_stop_comp); + complete_all(&cmd->t_transport_stop_comp); return; }
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