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authorCornelia Huck <cornelia.huck@de.ibm.com>2009-06-16 10:30:23 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 10:31:09 +0200
commit93a275921daf83e6e4efbafdd82712bcaa93f491 (patch)
treecdab651b0204c0cdeb5731b9f312ff407d821098
parentdcbd16d5111258df7c821ec1e4124fe6ffbf3c16 (diff)
[S390] pm: io subchannel driver power management callbacks
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/cio/device.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 228a6c314d8..64bd79ac25a 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -138,6 +138,19 @@ static struct css_device_id io_subchannel_ids[] = {
};
MODULE_DEVICE_TABLE(css, io_subchannel_ids);
+static int io_subchannel_prepare(struct subchannel *sch)
+{
+ struct ccw_device *cdev;
+ /*
+ * Don't allow suspend while a ccw device registration
+ * is still outstanding.
+ */
+ cdev = sch_get_cdev(sch);
+ if (cdev && !device_is_registered(&cdev->dev))
+ return -EAGAIN;
+ return 0;
+}
+
static struct css_driver io_subchannel_driver = {
.owner = THIS_MODULE,
.subchannel_type = io_subchannel_ids,
@@ -148,6 +161,7 @@ static struct css_driver io_subchannel_driver = {
.probe = io_subchannel_probe,
.remove = io_subchannel_remove,
.shutdown = io_subchannel_shutdown,
+ .prepare = io_subchannel_prepare,
};
struct workqueue_struct *ccw_device_work;