[PATCH 1/5] target: fix ordered CMD_T_SENT handling
From: Mike Christie <michael.christie@oracle.com>
Date: 2021-09-30 02:04:41
Also in:
target-devel
Subsystem:
scsi target subsystem, the rest · Maintainers:
"Martin K. Petersen", Linus Torvalds
We can race where target_handle_task_attr has put the cmd on the delayed_cmd_list. Then target_restart_delayed_cmds has removed it and set CMD_T_SENT, but then target_execute_cmd now clears that bit. This patch moves the clearing to before we've put the cmd on the list. Signed-off-by: Mike Christie <michael.christie@oracle.com> --- drivers/target/target_core_transport.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 14c6f2bb1b01..e02173a4b7bc 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c@@ -2200,6 +2200,10 @@ static bool target_handle_task_attr(struct se_cmd *cmd) if (atomic_read(&dev->dev_ordered_sync) == 0) return false; + spin_lock_irq(&cmd->t_state_lock); + cmd->transport_state &= ~CMD_T_SENT; + spin_unlock_irq(&cmd->t_state_lock); + spin_lock(&dev->delayed_cmd_lock); list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list); spin_unlock(&dev->delayed_cmd_lock);
@@ -2228,12 +2232,8 @@ void target_execute_cmd(struct se_cmd *cmd) if (target_write_prot_action(cmd)) return; - if (target_handle_task_attr(cmd)) { - spin_lock_irq(&cmd->t_state_lock); - cmd->transport_state &= ~CMD_T_SENT; - spin_unlock_irq(&cmd->t_state_lock); + if (target_handle_task_attr(cmd)) return; - } __target_execute_cmd(cmd, true); }
--
2.25.1