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[S390] cio: Re-start path verification after aborting internal I/O. 

Path verification triggered by changes to the available CHPIDs will be
interrupted by another change but not re-started. This results in an
invalid path mask.
To solve this make sure to completely re-start path verification when
changing the available paths.

Signed-off-by: Stefan Bader <shbader@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Stefan Bader 2007-04-27 16:01:33 +02:00 committed by Martin Schwidefsky
parent cfbe9bb2fb
commit 387b734fc2
1 changed files with 54 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

108
drivers/s390/cio/chsc.c
View File

@ -178,6 +178,38 @@ css_get_ssd_info(struct subchannel *sch)
return ret;
}
static int check_for_io_on_path(struct subchannel *sch, int mask)
{
int cc;
cc = stsch(sch->schid, &sch->schib);
if (cc)
return 0;
if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == mask)
return 1;
return 0;
}
static void terminate_internal_io(struct subchannel *sch)
{
if (cio_clear(sch)) {
/* Recheck device in case clear failed. */
sch->lpm = 0;
if (device_trigger_verify(sch) != 0) {
if(css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
}
return;
}
/* Request retry of internal operation. */
device_set_intretry(sch);
/* Call handler. */
if (sch->driver && sch->driver->termination)
sch->driver->termination(&sch->dev);
}
static int
s390_subchannel_remove_chpid(struct device *dev, void *data)
{
@ -208,37 +240,33 @@ s390_subchannel_remove_chpid(struct device *dev, void *data)
if (sch->schib.pmcw.pim == 0x80)
goto out_unreg;
if ((sch->schib.scsw.actl & SCSW_ACTL_DEVACT) &&
(sch->schib.scsw.actl & SCSW_ACTL_SCHACT) &&
(sch->schib.pmcw.lpum == mask)) {
int cc;
cc = cio_clear(sch);
if (cc == -ENODEV)
if (check_for_io_on_path(sch, mask)) {
if (device_is_online(sch))
device_kill_io(sch);
else {
terminate_internal_io(sch);
/* Re-start path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
}
} else {
/* trigger path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
else if (sch->lpm == mask)
goto out_unreg;
/* Request retry of internal operation. */
device_set_intretry(sch);
/* Call handler. */
if (sch->driver && sch->driver->termination)
sch->driver->termination(&sch->dev);
goto out_unlock;
}
/* trigger path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
else if (sch->lpm == mask)
goto out_unreg;
out_unlock:
spin_unlock_irq(sch->lock);
return 0;
out_unreg:
spin_unlock_irq(sch->lock);
sch->lpm = 0;
if (css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
spin_unlock_irq(sch->lock);
return 0;
}
@ -683,38 +711,6 @@ int chsc_chp_online(struct chp_id chpid)
return rc;
}
static int check_for_io_on_path(struct subchannel *sch, int index)
{
int cc;
cc = stsch(sch->schid, &sch->schib);
if (cc)
return 0;
if (sch->schib.scsw.actl && sch->schib.pmcw.lpum == (0x80 >> index))
return 1;
return 0;
}
static void terminate_internal_io(struct subchannel *sch)
{
if (cio_clear(sch)) {
/* Recheck device in case clear failed. */
sch->lpm = 0;
if (device_trigger_verify(sch) != 0) {
if(css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
need_rescan = 1;
}
}
return;
}
/* Request retry of internal operation. */
device_set_intretry(sch);
/* Call handler. */
if (sch->driver && sch->driver->termination)
sch->driver->termination(&sch->dev);
}
static void __s390_subchannel_vary_chpid(struct subchannel *sch,
struct chp_id chpid, int on)
{
@ -741,13 +737,17 @@ static void __s390_subchannel_vary_chpid(struct subchannel *sch,
}
sch->opm &= ~(0x80 >> chp);
sch->lpm &= ~(0x80 >> chp);
if (check_for_io_on_path(sch, chp)) {
if (check_for_io_on_path(sch, (0x80 >> chp))) {
if (device_is_online(sch))
/* Path verification is done after killing. */
device_kill_io(sch);
else
else {
/* Kill and retry internal I/O. */
terminate_internal_io(sch);
/* Re-start path verification. */
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
}
} else if (!sch->lpm) {
if (device_trigger_verify(sch) != 0) {
if (css_enqueue_subchannel_slow(sch->schid)) {