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qla2xxx: Fix incorrect tcm_qla2xxx_free_cmd use during TMR ABORT (v2)

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This patch drops two incorrect usages of tcm_qla2xxx_free_cmd()
during TMR ABORT within tcm_qla2xxx_handle_data_work() and
tcm_qla2xxx_aborted_task(), which where attempting to dispatch
into workqueue context to do tcm_qla2xxx_complete_free() and
subsequently invoke transport_generic_free_cmd().

This is incorrect because during TMR ABORT target-core will
drop the outstanding se_cmd->cmd_kref references once it has
quiesced the se_cmd via transport_wait_for_tasks(), and in
the case of qla2xxx it should not attempt to do it's own
transport_generic_free_cmd() once the abort has occured.

As reported by Pascal, this was originally manifesting as a
BUG_ON(cmd->cmd_in_wq) in qlt_free_cmd() during TMR ABORT,
with a LIO backend that had sufficently high enough WRITE
latency to trigger a host side TMR ABORT_TASK.

(v2: Drop the qla_tgt_cmd->write_pending_abort_comp changes,
     as they will be addressed in a seperate series)

Reported-by: Pascal de Bruijn <p.debruijn@unilogic.nl>
Tested-by: Pascal de Bruijn <p.debruijn@unilogic.nl>
Cc: Pascal de Bruijn <p.debruijn@unilogic.nl>
Reported-by: Lukasz Engel <lukasz.engel@softax.pl>
Cc: Lukasz Engel <lukasz.engel@softax.pl>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Cc: Quinn Tran <quinn.tran@cavium.com>
Cc: <stable@vger.kernel.org> # 3.10+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2017-06-30 00:08:13 -07:00
parent d96adb9b07
commit 6bcbb3174c
1 changed files with 0 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/scsi/qla2xxx/tcm_qla2xxx.c
View File

@ -500,7 +500,6 @@ static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
{
struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
unsigned long flags;
/*
* Ensure that the complete FCP WRITE payload has been received.
@ -508,17 +507,6 @@ static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
*/
cmd->cmd_in_wq = 0;
spin_lock_irqsave(&cmd->cmd_lock, flags);
cmd->data_work = 1;
if (cmd->aborted) {
cmd->data_work_free = 1;
spin_unlock_irqrestore(&cmd->cmd_lock, flags);
tcm_qla2xxx_free_cmd(cmd);
return;
}
spin_unlock_irqrestore(&cmd->cmd_lock, flags);
cmd->qpair->tgt_counters.qla_core_ret_ctio++;
if (!cmd->write_data_transferred) {
/*
@ -765,31 +753,13 @@ static void tcm_qla2xxx_queue_tm_rsp(struct se_cmd *se_cmd)
qlt_xmit_tm_rsp(mcmd);
}
#define DATA_WORK_NOT_FREE(_cmd) (_cmd->data_work && !_cmd->data_work_free)
static void tcm_qla2xxx_aborted_task(struct se_cmd *se_cmd)
{
struct qla_tgt_cmd *cmd = container_of(se_cmd,
struct qla_tgt_cmd, se_cmd);
unsigned long flags;
if (qlt_abort_cmd(cmd))
return;
spin_lock_irqsave(&cmd->cmd_lock, flags);
if ((cmd->state == QLA_TGT_STATE_NEW)||
((cmd->state == QLA_TGT_STATE_DATA_IN) &&
DATA_WORK_NOT_FREE(cmd))) {
cmd->data_work_free = 1;
spin_unlock_irqrestore(&cmd->cmd_lock, flags);
/*
* cmd has not reached fw, Use this trigger to free it.
*/
tcm_qla2xxx_free_cmd(cmd);
return;
}
spin_unlock_irqrestore(&cmd->cmd_lock, flags);
return;
}
static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *,