When ata_qc_complete() schedules a command for EH using
ata_qc_schedule_eh(), blk_abort_request() will be called, which leads to
req->q->mq_ops->timeout() / scsi_timeout() being called.
scsi_timeout(), if the LLDD has no abort handler (libata has no abort
handler), will set host byte to DID_TIME_OUT, and then call
scsi_eh_scmd_add() to add the command to EH.
Thus, when commands first enter libata's EH strategy_handler, all the
commands that have been added to EH will have DID_TIME_OUT set.
Commit e5dd410acb34 ("ata: libata: Clear DID_TIME_OUT for ATA PT commands
with sense data") clears this bogus DID_TIME_OUT flag for all commands
that reached libata's EH strategy_handler.
libata has its own flag (AC_ERR_TIMEOUT), that it sets for commands that
have not received a completion at the time of entering EH.
ata_eh_worth_retry() has no special handling for AC_ERR_TIMEOUT, so by
default timed out commands will get flag ATA_QCFLAG_RETRY set and will be
retried after the port has been reset (ata_eh_link_autopsy() always
triggers a port reset if any command has AC_ERR_TIMEOUT set).
For commands that have ATA_QCFLAG_RETRY set, but also has an error flag
set (e.g. AC_ERR_TIMEOUT), ata_eh_finish() will not increment
scmd->allowed, so the command will at most be retried (scmd->allowed
number of times, which by default is set to 3).
However, scsi_eh_flush_done_q() will only retry commands for which
scsi_noretry_cmd() returns false.
For commands that has DID_TIME_OUT set, if the command is either
has FAILFAST or if the command is a passthrough command, scsi_noretry_cmd()
will return true. Thus, such commands will never be retried.
Thus, make sure that libata sets SCSI's DID_TIME_OUT flag for commands that
actually timed out (libata's AC_ERR_TIMEOUT flag), such that timed out
commands will once again not be retried if they are also a FAILFAST or
passthrough command.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: e5dd410acb34 ("ata: libata: Clear DID_TIME_OUT for ATA PT commands with sense data")
Reported-by: Lai, Yi <yi1.lai@xxxxxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-ide/ZxYz871I3Blsi30F@ly-workstation/
Signed-off-by: Niklas Cassel <cassel@xxxxxxxxxx>
---
drivers/ata/libata-eh.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index fa41ea57a978..3b303d4ae37a 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -651,6 +651,7 @@ void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
/* the scmd has an associated qc */
if (!(qc->flags & ATA_QCFLAG_EH)) {
/* which hasn't failed yet, timeout */
+ set_host_byte(scmd, DID_TIME_OUT);
qc->err_mask |= AC_ERR_TIMEOUT;
qc->flags |= ATA_QCFLAG_EH;
nr_timedout++;
--
2.47.0
