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scsi: qla2xxx: target: Fix offline port handling and host reset handling

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Remove the function qlt_abort_cmd_on_host_reset() because it can do the
following, all of which can cause a kernel crash:

- DMA unmapping while DMA is in progress.
- Call target_execute_cmd() while DMA is in progress.
- Call transport_generic_free_cmd() while the LIO core owns a command.

Instead of trying to abort a command asynchronously, set the 'aborted' flag
and handle the abort after the hardware has passed control back to the
tcm_qla2xxx driver.

Cc: Arun Easi <arun.easi@qlogic.com>
Cc: Himanshu Madhani <hmadhani@marvell.com>
Cc: Giridhar Malavali <gmalavali@marvell.com>
Fixes: c0cb44967b ("qla2xxx: Add Host reset handling in target mode.") # v3.18.
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bart Van Assche 2019-04-17 14:44:29 -07:00 committed by Martin K. Petersen
parent e209783d66
commit aefed3e554
4 changed files with 16 additions and 48 deletions
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9
drivers/scsi/qla2xxx/qla_os.c
View file

@ -1837,15 +1837,10 @@ __qla2x00_abort_all_cmds(struct qla_qpair *qp, int res)
continue;
}
cmd = (struct qla_tgt_cmd *)sp;
qlt_abort_cmd_on_host_reset(cmd->vha, cmd);
cmd->aborted = 1;
break;
case TYPE_TGT_TMCMD:
/*
* Currently, only ABTS response gets on the
* outstanding_cmds[]
*/
ha->tgt.tgt_ops->free_mcmd(
(struct qla_tgt_mgmt_cmd *)sp);
/* Skip task management functions. */
break;
default:
break;

41
drivers/scsi/qla2xxx/qla_target.c
View file

@ -3268,7 +3268,6 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
if (!qpair->fw_started || (cmd->reset_count != qpair->chip_reset) ||
(cmd->sess && cmd->sess->deleted)) {
cmd->state = QLA_TGT_STATE_PROCESSED;
qlt_abort_cmd_on_host_reset(cmd->vha, cmd);
return 0;
}
@ -3297,7 +3296,6 @@ int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
* previous life, just abort the processing.
*/
cmd->state = QLA_TGT_STATE_PROCESSED;
qlt_abort_cmd_on_host_reset(cmd->vha, cmd);
ql_dbg_qp(ql_dbg_async, qpair, 0xe101,
"RESET-RSP online/active/old-count/new-count = %d/%d/%d/%d.\n",
vha->flags.online, qla2x00_reset_active(vha),
@ -3438,8 +3436,10 @@ int qlt_rdy_to_xfer(struct qla_tgt_cmd *cmd)
* Either the port is not online or this request was from
* previous life, just abort the processing.
*/
cmd->state = QLA_TGT_STATE_NEED_DATA;
qlt_abort_cmd_on_host_reset(cmd->vha, cmd);
cmd->aborted = 1;
cmd->write_data_transferred = 0;
cmd->state = QLA_TGT_STATE_DATA_IN;
vha->hw->tgt.tgt_ops->handle_data(cmd);
ql_dbg_qp(ql_dbg_async, qpair, 0xe102,
"RESET-XFR online/active/old-count/new-count = %d/%d/%d/%d.\n",
vha->flags.online, qla2x00_reset_active(vha),
@ -3961,39 +3961,6 @@ static void *qlt_ctio_to_cmd(struct scsi_qla_host *vha,
return cmd;
}
/* hardware_lock should be held by caller. */
void
qlt_abort_cmd_on_host_reset(struct scsi_qla_host *vha, struct qla_tgt_cmd *cmd)
{
struct qla_hw_data *ha = vha->hw;
if (cmd->sg_mapped)
qlt_unmap_sg(vha, cmd);
/* TODO: fix debug message type and ids. */
if (cmd->state == QLA_TGT_STATE_PROCESSED) {
ql_dbg(ql_dbg_io, vha, 0xff00,
"HOST-ABORT: state=PROCESSED.\n");
} else if (cmd->state == QLA_TGT_STATE_NEED_DATA) {
cmd->write_data_transferred = 0;
cmd->state = QLA_TGT_STATE_DATA_IN;
ql_dbg(ql_dbg_io, vha, 0xff01,
"HOST-ABORT: state=DATA_IN.\n");
ha->tgt.tgt_ops->handle_data(cmd);
return;
} else {
ql_dbg(ql_dbg_io, vha, 0xff03,
"HOST-ABORT: state=BAD(%d).\n",
cmd->state);
dump_stack();
}
cmd->trc_flags |= TRC_FLUSH;
ha->tgt.tgt_ops->free_cmd(cmd);
}
/*
* ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
*/

11
drivers/scsi/qla2xxx/qla_target.h
View file

@ -889,9 +889,16 @@ struct qla_tgt_cmd {
unsigned int term_exchg:1;
unsigned int cmd_sent_to_fw:1;
unsigned int cmd_in_wq:1;
unsigned int aborted:1;
unsigned int released:1;
/*
* This variable may be set from outside the LIO and I/O completion
* callback functions. Do not declare this member variable as a
* bitfield to avoid a read-modify-write operation when this variable
* is set.
*/
unsigned int aborted;
struct scatterlist *sg; /* cmd data buffer SG vector */
int sg_cnt; /* SG segments count */
int bufflen; /* cmd buffer length */
@ -1101,7 +1108,5 @@ extern void qlt_do_generation_tick(struct scsi_qla_host *, int *);
void qlt_send_resp_ctio(struct qla_qpair *, struct qla_tgt_cmd *, uint8_t,
uint8_t, uint8_t, uint8_t);
extern void qlt_abort_cmd_on_host_reset(struct scsi_qla_host *,
struct qla_tgt_cmd *);
#endif /* __QLA_TARGET_H */

3
drivers/scsi/qla2xxx/tcm_qla2xxx.c
View file

@ -504,7 +504,8 @@ static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
if (cmd->aborted) {
spin_unlock_irqrestore(&cmd->cmd_lock, flags);
tcm_qla2xxx_free_cmd(cmd);
transport_generic_request_failure(&cmd->se_cmd,
TCM_CHECK_CONDITION_ABORT_CMD);
return;
}
spin_unlock_irqrestore(&cmd->cmd_lock, flags);