[patch 49/52] [PATCH] cio: quiesce subchannel in io_subchannel_remove

Martin Schwidefsky
2009-11-13T15:10:20Z

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From: Sebastian Ott <sebott@linux.vnet.ibm.com>

Ensure that there will be no more interrupts for an
unregistered device by using the same quiesce and disable loop
as in io_subchannel_shutdown.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

drivers/s390/cio/device.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

Index: quilt-2.6/drivers/s390/cio/device.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/device.c 2009-11-13 16:08:22.000000000 +0100
+++ quilt-2.6/drivers/s390/cio/device.c 2009-11-13 16:08:22.000000000 +0100
@@ -1059,6 +1059,8 @@
return 0;
}

+static void io_subchannel_quiesce(struct subchannel *);
+
static int
io_subchannel_remove (struct subchannel *sch)
{
@@ -1068,6 +1070,7 @@
cdev = sch_get_cdev(sch);
if (!cdev)
goto out_free;
+ io_subchannel_quiesce(sch);
/* Set ccw device to not operational and drop reference. */
spin_lock_irqsave(cdev->ccwlock, flags);
sch_set_cdev(sch, NULL);
@@ -1150,7 +1153,7 @@
return 0;
}

-static void io_subchannel_shutdown(struct subchannel *sch)
+static void io_subchannel_quiesce(struct subchannel *sch)
{
struct ccw_device *cdev;
int ret;
@@ -1182,6 +1185,11 @@
spin_unlock_irq(sch->lock);
}

+static void io_subchannel_shutdown(struct subchannel *sch)
+{
+ io_subchannel_quiesce(sch);
+}
+
static int device_is_disconnected(struct ccw_device *cdev)
{
if (!cdev)