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Subject[patch 2/2] s390: fix locking in __chp_add() and s390_subchannel_remove_chpid()
From: Cornelia Huck <cornelia.huck@de.ibm.com>

Fix locking in __chp_add() and s390_subchannel_remove_chpid():
Need to disable/enable because they are always called from a thread (and not
directly from a machine check...)

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---

drivers/s390/cio/chsc.c | 10 +++++-----
1 files changed, 5 insertions(+), 5 deletions(-)

diff -urpN linux-2.6/drivers/s390/cio/chsc.c linux-2.6-patched/drivers/s390/cio/chsc.c
--- linux-2.6/drivers/s390/cio/chsc.c 2006-02-10 08:22:28.000000000 +0100
+++ linux-2.6-patched/drivers/s390/cio/chsc.c 2006-02-10 08:23:00.000000000 +0100
@@ -232,7 +232,7 @@ s390_subchannel_remove_chpid(struct devi
return 0;

mask = 0x80 >> j;
- spin_lock(&sch->lock);
+ spin_lock_irq(&sch->lock);

stsch(sch->schid, &schib);
if (!schib.pmcw.dnv)
@@ -281,10 +281,10 @@ s390_subchannel_remove_chpid(struct devi
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);
out_unlock:
- spin_unlock(&sch->lock);
+ spin_unlock_irq(&sch->lock);
return 0;
out_unreg:
- spin_unlock(&sch->lock);
+ spin_unlock_irq(&sch->lock);
sch->lpm = 0;
if (css_enqueue_subchannel_slow(sch->schid)) {
css_clear_subchannel_slow_list();
@@ -652,7 +652,7 @@ __chp_add(struct subchannel_id schid, vo
if (!sch)
/* Check if the subchannel is now available. */
return __chp_add_new_sch(schid);
- spin_lock(&sch->lock);
+ spin_lock_irq(&sch->lock);
for (i=0; i<8; i++)
if (sch->schib.pmcw.chpid[i] == chp->id) {
if (stsch(sch->schid, &sch->schib) != 0) {
@@ -674,7 +674,7 @@ __chp_add(struct subchannel_id schid, vo
if (sch->driver && sch->driver->verify)
sch->driver->verify(&sch->dev);

- spin_unlock(&sch->lock);
+ spin_unlock_irq(&sch->lock);
put_device(&sch->dev);
return 0;
}
-
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