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[SCSI] pm8001: fix DEV_IS_GONE infinite retry 

On the pm8001, when a device is in the process of going away (device
power off or hot plug), depending on the timing, the driver would return
SAS_PHY_DOWN as the return value to the queuecommand DEV_IS_GONE logic.
The net result is an near infinite retry (especially if SAS debugging is
enabled), the logs will fill with:

kernel: mpi_ssp_completion 2119:e21:SSP IO status 0x13 tag 0xcc1c0000
dlen=90 param=0xe
kernel: wwn=5000c50034069e86  cdb=12 00 00 00 5a 00 00 00 00 00 00 00 00
00 00 00
kernel: sas: lldd_execute_task returned: 138
kernel: sas: lldd_execute_task returned: 138
kernel: sas: lldd_execute_task returned: 138
kernel: sas: lldd_execute_task returned: 138
kernel: sas: lldd_execute_task returned: 138
kernel: sas: lldd_execute_task returned: 138
kernel: sas: lldd_execute_task returned: 138
. . .

This patch changes to leverage the port_attached logic to complete the
command with a status of PHY_DOWN so that the disposition can be handled
immediately and correctly.

Signed-off-by: Mark Salyzyn <mark_salyzyn@us.xyratex.com>
Acked-by: Jack Wang <jack_wang@usish.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Mark Salyzyn 2011-09-22 08:50:01 -07:00 committed by James Bottomley
parent 860eca2b2b
commit b90b378ad5
1 changed files with 1 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/scsi/pm8001/pm8001_sas.c
View File

@ -356,21 +356,8 @@ static int pm8001_task_exec(struct sas_task *task, const int num,
do {
dev = t->dev;
pm8001_dev = dev->lldd_dev;
if (DEV_IS_GONE(pm8001_dev)) {
if (pm8001_dev) {
PM8001_IO_DBG(pm8001_ha,
pm8001_printk("device %d not ready.\n",
pm8001_dev->device_id));
} else {
PM8001_IO_DBG(pm8001_ha,
pm8001_printk("device %016llx not "
"ready.\n", SAS_ADDR(dev->sas_addr)));
}
rc = SAS_PHY_DOWN;
goto out_done;
}
port = &pm8001_ha->port[sas_find_local_port_id(dev)];
if (!port->port_attached) {
if (DEV_IS_GONE(pm8001_dev) || !port->port_attached) {
if (sas_protocol_ata(t->task_proto)) {
struct task_status_struct *ts = &t->task_status;
ts->resp = SAS_TASK_UNDELIVERED;