From 52208ae3fc60cbcb214c10fb8b82304199e2cc3a Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Thu, 24 Feb 2011 16:58:20 -0800 Subject: [PATCH] [SCSI] target: Fix t_transport_aborted handling in LUN_RESET + active I/O shutdown This patch addresses two outstanding bugs related to T_TASK(cmd)->t_transport_aborted handling during TMR LUN_RESET and active I/O shutdown. This first involves adding two explict t_transport_aborted=1 assignments in core_tmr_lun_reset() in order to signal the task has been aborted, and updating transport_generic_wait_for_tasks() to skip sleeping when t_transport_aborted=1 has been set. This fixes an issue where transport_generic_wait_for_tasks() would end up sleeping indefinately when called from fabric module context while TMR LUN_RESET was happening with long outstanding backend struct se_task not yet being completed. The second adds a missing call to transport_remove_task_from_execute_queue() when task->task_execute_queue=1 is set in order to fix an OOPs when task->t_execute_list has not been dropped. It also fixes the same case in transport_processing_shutdown() to prevent the issue from happening during active I/O struct se_device shutdown. Signed-off-by: Nicholas A. Bellinger Signed-off-by: James Bottomley --- drivers/target/target_core_tmr.c | 5 +++++ drivers/target/target_core_transport.c | 8 ++++++-- include/target/target_core_transport.h | 2 ++ 3 files changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c index 158cecbec718..4a109835e420 100644 --- a/drivers/target/target_core_tmr.c +++ b/drivers/target/target_core_tmr.c @@ -282,6 +282,9 @@ int core_tmr_lun_reset( atomic_set(&task->task_active, 0); atomic_set(&task->task_stop, 0); + } else { + if (atomic_read(&task->task_execute_queue) != 0) + transport_remove_task_from_execute_queue(task, dev); } __transport_stop_task_timer(task, &flags); @@ -301,6 +304,7 @@ int core_tmr_lun_reset( DEBUG_LR("LUN_RESET: got t_transport_active = 1 for" " task: %p, t_fe_count: %d dev: %p\n", task, fe_count, dev); + atomic_set(&T_TASK(cmd)->t_transport_aborted, 1); spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); @@ -310,6 +314,7 @@ int core_tmr_lun_reset( } DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p," " t_fe_count: %d dev: %p\n", task, fe_count, dev); + atomic_set(&T_TASK(cmd)->t_transport_aborted, 1); spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 236e22d8cfae..4bbf6c147f89 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -1207,7 +1207,7 @@ transport_get_task_from_execute_queue(struct se_device *dev) * * */ -static void transport_remove_task_from_execute_queue( +void transport_remove_task_from_execute_queue( struct se_task *task, struct se_device *dev) { @@ -5549,7 +5549,8 @@ static void transport_generic_wait_for_tasks( atomic_set(&T_TASK(cmd)->transport_lun_stop, 0); } - if (!atomic_read(&T_TASK(cmd)->t_transport_active)) + if (!atomic_read(&T_TASK(cmd)->t_transport_active) || + atomic_read(&T_TASK(cmd)->t_transport_aborted)) goto remove; atomic_set(&T_TASK(cmd)->t_transport_stop, 1); @@ -5956,6 +5957,9 @@ static void transport_processing_shutdown(struct se_device *dev) atomic_set(&task->task_active, 0); atomic_set(&task->task_stop, 0); + } else { + if (atomic_read(&task->task_execute_queue) != 0) + transport_remove_task_from_execute_queue(task, dev); } __transport_stop_task_timer(task, &flags); diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h index 246940511579..2e8ec51f0615 100644 --- a/include/target/target_core_transport.h +++ b/include/target/target_core_transport.h @@ -135,6 +135,8 @@ extern void transport_complete_task(struct se_task *, int); extern void transport_add_task_to_execute_queue(struct se_task *, struct se_task *, struct se_device *); +extern void transport_remove_task_from_execute_queue(struct se_task *, + struct se_device *); unsigned char *transport_dump_cmd_direction(struct se_cmd *); extern void transport_dump_dev_state(struct se_device *, char *, int *); extern void transport_dump_dev_info(struct se_device *, struct se_lun *, -- 2.20.1