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[S390] subchannel lock conversion.

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Convert the subchannel lock to a pointer to a lock.  Needed for the dynamic
subchannel mapping patch.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck
2006-12-08 15:54:26 +01:00
committed by Martin Schwidefsky
parent 7674da77cb
commit 2ec2298412
6 changed files with 98 additions and 63 deletions
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58
drivers/s390/cio/cio.c
View File

@@ -143,11 +143,11 @@ cio_tpi(void)
return 1;
local_bh_disable();
irq_enter ();
spin_lock(&sch->lock);
spin_lock(sch->lock);
memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
if (sch->driver && sch->driver->irq)
sch->driver->irq(&sch->dev);
spin_unlock(&sch->lock);
spin_unlock(sch->lock);
irq_exit ();
_local_bh_enable();
return 1;
@@ -496,6 +496,15 @@ cio_disable_subchannel (struct subchannel *sch)
return ret;
}
static int cio_create_sch_lock(struct subchannel *sch)
{
sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
if (!sch->lock)
return -ENOMEM;
spin_lock_init(sch->lock);
return 0;
}
/*
* cio_validate_subchannel()
*
@@ -513,6 +522,7 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
{
char dbf_txt[15];
int ccode;
int err;
sprintf (dbf_txt, "valsch%x", schid.sch_no);
CIO_TRACE_EVENT (4, dbf_txt);
@@ -520,9 +530,15 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
/* Nuke all fields. */
memset(sch, 0, sizeof(struct subchannel));
spin_lock_init(&sch->lock);
sch->schid = schid;
if (cio_is_console(schid)) {
sch->lock = cio_get_console_lock();
} else {
err = cio_create_sch_lock(sch);
if (err)
goto out;
}
mutex_init(&sch->reg_mutex);
/* Set a name for the subchannel */
snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
schid.sch_no);
@@ -534,10 +550,10 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
* is not valid.
*/
ccode = stsch_err (schid, &sch->schib);
if (ccode)
return (ccode == 3) ? -ENXIO : ccode;
sch->schid = schid;
if (ccode) {
err = (ccode == 3) ? -ENXIO : ccode;
goto out;
}
/* Copy subchannel type from path management control word. */
sch->st = sch->schib.pmcw.st;
@@ -550,14 +566,16 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
"non-I/O subchannel type %04X\n",
sch->schid.ssid, sch->schid.sch_no, sch->st);
/* We stop here for non-io subchannels. */
return sch->st;
err = sch->st;
goto out;
}
/* Initialization for io subchannels. */
if (!sch->schib.pmcw.dnv)
if (!sch->schib.pmcw.dnv) {
/* io subchannel but device number is invalid. */
return -ENODEV;
err = -ENODEV;
goto out;
}
/* Devno is valid. */
if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
/*
@@ -567,7 +585,8 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
CIO_MSG_EVENT(0, "Blacklisted device detected "
"at devno %04X, subchannel set %x\n",
sch->schib.pmcw.dev, sch->schid.ssid);
return -ENODEV;
err = -ENODEV;
goto out;
}
sch->opm = 0xff;
if (!cio_is_console(sch->schid))
@@ -595,6 +614,11 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
if ((sch->lpm & (sch->lpm - 1)) != 0)
sch->schib.pmcw.mp = 1; /* multipath mode */
return 0;
out:
if (!cio_is_console(schid))
kfree(sch->lock);
sch->lock = NULL;
return err;
}
/*
@@ -637,7 +661,7 @@ do_IRQ (struct pt_regs *regs)
}
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (sch)
spin_lock(&sch->lock);
spin_lock(sch->lock);
/* Store interrupt response block to lowcore. */
if (tsch (tpi_info->schid, irb) == 0 && sch) {
/* Keep subchannel information word up to date. */
@@ -648,7 +672,7 @@ do_IRQ (struct pt_regs *regs)
sch->driver->irq(&sch->dev);
}
if (sch)
spin_unlock(&sch->lock);
spin_unlock(sch->lock);
/*
* Are more interrupts pending?
* If so, the tpi instruction will update the lowcore
@@ -687,10 +711,10 @@ wait_cons_dev (void)
__ctl_load (cr6, 6, 6);
do {
spin_unlock(&console_subchannel.lock);
spin_unlock(console_subchannel.lock);
if (!cio_tpi())
cpu_relax();
spin_lock(&console_subchannel.lock);
spin_lock(console_subchannel.lock);
} while (console_subchannel.schib.scsw.actl != 0);
/*
* restore previous isc value