Patch "target: Fix quiese during transport_write_pending_qf endless loop" has been added to the 4.14-stable tree
Subsystems (2)
This is a note to let you know that I've just added the patch titled
target: Fix quiese during transport_write_pending_qf endless loop
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
target-fix-quiese-during-transport_write_pending_qf-endless-loop.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
9574a497df2bbc0a676b609ce0dd24d237cee3a6Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <[email protected]>
Date: Fri, 29 Sep 2017 16:43:11 -0700
Subject: target: Fix quiese during transport_write_pending_qf endless loop
From: Nicholas Bellinger <[email protected]>
commit 9574a497df2bbc0a676b609ce0dd24d237cee3a6 upstream.
This patch fixes a potential end-less loop during QUEUE_FULL, where cmd->se_tfo->write_pending() callback fails repeatedly but __transport_wait_for_tasks() has already been invoked to quiese the outstanding se_cmd descriptor.
To address this bug, this patch adds a CMD_T_STOP|CMD_T_ABORTED check within transport_write_pending_qf() and invokes the existing se_cmd->t_transport_stop_comp to signal quiese completion back to __transport_wait_for_tasks().
--- drivers/target/target_core_transport.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
drivers/target/target_core_transport.c +13 -0
@@ -2575,7 +2575,20 @@ EXPORT_SYMBOL(transport_generic_new_cmd)static void transport_write_pending_qf (struct se_cmd *cmd) { +unsigned long flags;int ret; +bool stop; + +spin_lock_irqsave (&cmd->t_state_lock, flags); + stop = (cmd->transport_state & (CMD_T_STOP |CMD_T_ABORTED )); +spin_unlock_irqrestore (&cmd->t_state_lock, flags); + +if (stop) { +pr_debug ("%s:%d CMD_T_STOP|CMD_T_ABORTED for ITT: 0x%08llx\n" , + __func__, __LINE__, cmd->tag); +complete_all (&cmd->t_transport_stop_comp); +return ; + } ret = cmd->se_tfo->write_pending (cmd);if (ret) {
Patches currently in stable-queue which might be from [email protected] are
queue-4.14/target-fix-null-pointer-regression-in-core_tmr_drain_tmr_list.patch queue-4.14/iscsi-target-make-task_reassign-use-proper-se_cmd-cmd_kref.patch queue-4.14/target-fix-queue_full-scsi-task-attribute-handling.patch queue-4.14/target-fix-buffer-offset-in-core_scsi3_pri_read_full_status.patch queue-4.14/iscsi-target-fix-non-immediate-tmr-reference-leak.patch queue-4.14/target-fix-caw_sem-leak-in-transport_generic_request_failure.patch queue-4.14/target-avoid-early-cmd_t_pre_execute-failures-during-abort_task.patch queue-4.14/target-fix-quiese-during-transport_write_pending_qf-endless-loop.patch