target: Fix missing complete during ABORT_TASK + CMD_T_FABRIC_STOP

During transport_generic_free_cmd() with a concurrent TMR
ABORT_TASK and shutdown CMD_T_FABRIC_STOP bit set, the
caller will be blocked on se_cmd->cmd_wait_stop completion
until the final kref_put() -> target_release_cmd_kref()
has been invoked to call complete().

However, when ABORT_TASK is completed with FUNCTION_COMPLETE
in core_tmr_abort_task(), the aborted se_cmd will have already
been removed from se_sess->sess_cmd_list via list_del_init().

This results in target_release_cmd_kref() hitting the
legacy list_empty() == true check, invoking ->release_cmd()
but skipping complete() to wakeup se_cmd->cmd_wait_stop
blocked earlier in transport_generic_free_cmd() code.

To address this bug, it's safe to go ahead and drop the
original list_empty() check so that fabric_stop invokes
the complete() as expected, since list_del_init() can
safely be used on a empty list.

Cc: Mike Christie <mchristi@redhat.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Himanshu Madhani <himanshu.madhani@qlogic.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: stable@vger.kernel.org # 3.14+
Tested-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 5ab3967dda43ee989a6a4e5ccf1a553e67a7a0db..ae97e81141ed751875442e76f1622b00512823fc 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -2557,12 +2557,6 @@ static void target_release_cmd_kref(struct kref *kref)
        bool fabric_stop;
 
        spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
-       if (list_empty(&se_cmd->se_cmd_list)) {
-               spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
-               target_free_cmd_mem(se_cmd);
-               se_cmd->se_tfo->release_cmd(se_cmd);
-               return;
-       }
 
        spin_lock(&se_cmd->t_state_lock);
        fabric_stop = (se_cmd->transport_state & CMD_T_FABRIC_STOP);