From: Nicholas Bellinger <[email protected]> 3.12-stable review patch. If anyone has any objections, please let me know.
=============== 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 <[email protected]> Cc: Charalampos Pournaris <[email protected]> Signed-off-by: Nicholas Bellinger <[email protected]> Signed-off-by: Jiri Slaby <[email protected]> --- drivers/target/target_core_transport.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 7756d069dcee..66c0541ee910 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -552,7 +552,7 @@ static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists, spin_unlock_irqrestore(&cmd->t_state_lock, flags); - complete(&cmd->t_transport_stop_comp); + complete_all(&cmd->t_transport_stop_comp); return 1; } @@ -674,7 +674,7 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) 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); @@ -1749,7 +1749,7 @@ void target_execute_cmd(struct se_cmd *cmd) 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; } -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
