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scsi: core: Always send batch on reset or error handling command 

commit 066c5b46b6eaf2f13f80c19500dbb3b84baabb33 upstream.

In commit 8930a6c207 ("scsi: core: add support for request batching") the
block layer bd->last flag was mapped to SCMD_LAST and used as an indicator
to send the batch for the drivers that implement this feature. However, the
error handling code was not updated accordingly.

scsi_send_eh_cmnd() is used to send error handling commands and request
sense. The problem is that request sense comes as a single command that
gets into the batch queue and times out. As a result the device goes
offline after several failed resets. This was observed on virtio_scsi
during a device resize operation.

[  496.316946] sd 0:0:4:0: [sdd] tag#117 scsi_eh_0: requesting sense
[  506.786356] sd 0:0:4:0: [sdd] tag#117 scsi_send_eh_cmnd timeleft: 0
[  506.787981] sd 0:0:4:0: [sdd] tag#117 abort

To fix this always set SCMD_LAST flag in scsi_send_eh_cmnd() and
scsi_reset_ioctl().

Fixes: 8930a6c207 ("scsi: core: add support for request batching")
Cc: <stable@vger.kernel.org>
Signed-off-by: Alexander Atanasov <alexander.atanasov@virtuozzo.com>
Link: https://lore.kernel.org/r/20231215121008.2881653-1-alexander.atanasov@virtuozzo.com
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Atanasov 2023-12-15 14:10:08 +02:00 committed by Greg Kroah-Hartman
parent 72e472a91c
commit d2b549d310
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/scsi_error.c
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@ -1108,6 +1108,7 @@ static enum scsi_disposition scsi_send_eh_cmnd(struct scsi_cmnd *scmd,
scsi_log_send(scmd);
scmd->submitter = SUBMITTED_BY_SCSI_ERROR_HANDLER;
scmd->flags |= SCMD_LAST;
/*
* Lock sdev->state_mutex to avoid that scsi_device_quiesce() can
@ -2402,6 +2403,7 @@ scsi_ioctl_reset(struct scsi_device *dev, int __user *arg)
scsi_init_command(dev, scmd);
scmd->submitter = SUBMITTED_BY_SCSI_RESET_IOCTL;
scmd->flags |= SCMD_LAST;
memset(&scmd->sdb, 0, sizeof(scmd->sdb));
scmd->cmd_len = 0;