This is a note to let you know that I've just added the patch titled
target: Fix early transport_generic_handle_tmr abort scenario
to the 4.4-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-early-transport_generic_handle_tmr-abort-scenario.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c54eeffbe9338fa982dc853d816fda9202a13b5a Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Date: Tue, 6 Dec 2016 22:45:46 -0800
Subject: target: Fix early transport_generic_handle_tmr abort scenario
From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
commit c54eeffbe9338fa982dc853d816fda9202a13b5a upstream.
This patch fixes a bug where incoming task management requests
can be explicitly aborted during an active LUN_RESET, but who's
struct work_struct are canceled in-flight before execution.
This occurs when core_tmr_drain_tmr_list() invokes cancel_work_sync()
for the incoming se_tmr_req->task_cmd->work, resulting in cmd->work
for target_tmr_work() never getting invoked and the aborted TMR
waiting indefinately within transport_wait_for_tasks().
To address this case, perform a CMD_T_ABORTED check early in
transport_generic_handle_tmr(), and invoke the normal path via
transport_cmd_check_stop_to_fabric() to complete any TMR kthreads
blocked waiting for CMD_T_STOP in transport_wait_for_tasks().
Also, move the TRANSPORT_ISTATE_PROCESSING assignment earlier
into transport_generic_handle_tmr() so the existing check in
core_tmr_drain_tmr_list() avoids attempting abort the incoming
se_tmr_req->task_cmd->work if it has already been queued into
se_device->tmr_wq.
Reported-by: Rob Millner <rlm@xxxxxxxxxxxxx>
Tested-by: Rob Millner <rlm@xxxxxxxxxxxxx>
Cc: Rob Millner <rlm@xxxxxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/target/target_core_transport.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -3058,7 +3058,6 @@ static void target_tmr_work(struct work_
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
goto check_stop;
}
- cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cmd->se_tfo->queue_tm_rsp(cmd);
@@ -3071,11 +3070,25 @@ int transport_generic_handle_tmr(
struct se_cmd *cmd)
{
unsigned long flags;
+ bool aborted = false;
spin_lock_irqsave(&cmd->t_state_lock, flags);
- cmd->transport_state |= CMD_T_ACTIVE;
+ if (cmd->transport_state & CMD_T_ABORTED) {
+ aborted = true;
+ } else {
+ cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
+ cmd->transport_state |= CMD_T_ACTIVE;
+ }
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
+ if (aborted) {
+ pr_warn_ratelimited("handle_tmr caught CMD_T_ABORTED TMR %d"
+ "ref_tag: %llu tag: %llu\n", cmd->se_tmr_req->function,
+ cmd->se_tmr_req->ref_task_tag, cmd->tag);
+ transport_cmd_check_stop_to_fabric(cmd);
+ return 0;
+ }
+
INIT_WORK(&cmd->work, target_tmr_work);
queue_work(cmd->se_dev->tmr_wq, &cmd->work);
return 0;
Patches currently in stable-queue which might be from nab@xxxxxxxxxxxxxxx are
queue-4.4/target-fix-compare_and_write-ref-leak-for-non-good-status.patch
queue-4.4/target-use-correct-scsi-status-during-extended_copy-exception.patch
queue-4.4/target-don-t-bug_on-during-nodeacl-dynamic-explicit-conversion.patch
queue-4.4/target-fix-early-transport_generic_handle_tmr-abort-scenario.patch
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