On 22/06/2021 04:40, Yufen Yu wrote:
We found that offline a sata device on hisi sas control and then
/s/sata/SATA/
/s/control/controller/
scanning the host can probe 255 not-existant devices into system.
[root@localhost ~]# lsscsi
[2:0:0:0] disk ATA Samsung SSD 860 2B6Q /dev/sda
[2:0:1:0] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdb
[2:0:2:0] disk SEAGATE ST600MM0006 B001 /dev/sdc
1) echo "offline" > /sys/block/sdb/device/state
2) echo "- - -" > /sys/class/scsi_host/host2/scan
Then, we can see another 255 non-existant devices in system:
[root@localhost ~]# lsscsi
[2:0:0:0] disk ATA Samsung SSD 860 2B6Q /dev/sda
[2:0:1:0] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdb
[2:0:1:1] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdh
...
[2:0:1:255] disk ATA WDC WD2003FYYS-3 1D01 /dev/sdjb
After REPORT LUN command issued to the offline device fail, it tries
to do a sequential scan and probe all devices whose lun is not 0
successfully.
To fix the problem, we try to do same things as commit 2fc62e2ac350
("[SCSI] libsas: disable scanning lun > 0 on ata devices"), which
will prevent the device whose lun number is not zero probe into system.
I thought that we would mention why we don't change aic7xxx driver.
Reported-by: Wu Bo<wubo40@xxxxxxxxxx>
Suggested-by: John Garry<john.garry@xxxxxxxxxx>
Signed-off-by: Yufen Yu<yuyufen@xxxxxxxxxx>
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Apart from the small items above:
Reviewed-by: John Garry <john.garry@xxxxxxxxxx>
