When an NCQ error occurs, the controller will abnormally complete the I/Os
that are newly delivered to disk, and bit8 in CQ dw3 will be set which
indicates that the SATA disk is in error state. The current processing flow
is to set ts->stat to SAS_OPEN_REJECT and then sas_ata_task_done() will set
FIS stat to ATA_ERR. After analyzing the I/O by ata_eh_analyze_tf(),
err_mask will set to AC_ERR_HSM. If media error occurs for four times
within 10 minutes and the chip rejects new I/Os for four times, NCQ will be
disabled due to excessive errors, which is undesirable.

Therefore, use sas_task_abort() to handle abnormally completed I/Os when
SATA disk is in error state, as these abnormally completed I/Os are already
processed by sas_ata_device_link_abort() and qc->flag are set to
ATA_QCFLAG_FAILED. If sas_task_abort() is used, qc->err_mask will not be
modified in EH. Unlike the current process flow, it will not increase the
count of ECAT_TOUT_HSM and not turn off NCQ. Like other I/Os on the disk
that do not have an error but do not return after the NCQ error, they are
retried after the EH.
Signed-off-by: Xingui Yang <yangxingui@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1665998435-199946-5-git-send-email-john.garry@huawei.comSigned-off-by: Martin K. Petersen <martin.petersen@oracle.com>