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authorSebastian Ott <sebott@linux.vnet.ibm.com>2011-12-01 13:32:21 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2011-12-01 13:32:18 +0100
commit50c8e31f38f380f04885c66bde0bc4c946e786ee (patch)
tree65a6d9ae4ba28afb5707085aeb829af1a6beb240 /drivers/s390/cio/device_ops.c
parent659213b899f389d3a1e211796713ceaaa280fa44 (diff)
downloadop-kernel-dev-50c8e31f38f380f04885c66bde0bc4c946e786ee.zip
op-kernel-dev-50c8e31f38f380f04885c66bde0bc4c946e786ee.tar.gz
[S390] cio: provide fake irb for transport mode IO
If a driver wants to do command mode IO while CIO is doing online path verification we ignore this request and provide a fake irb when we are done and the driver can do IO again. For transport mode IO we have no such mechanism, giving the driver no other chance then to retry the action until we are done. This is not very reliable. Provide a fake irb for transport mode IO as well. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_ops.c')
-rw-r--r--drivers/s390/cio/device_ops.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 41c21ad..ec7fb6d 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -198,7 +198,7 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
if (cdev->private->state == DEV_STATE_VERIFY) {
/* Remember to fake irb when finished. */
if (!cdev->private->flags.fake_irb) {
- cdev->private->flags.fake_irb = 1;
+ cdev->private->flags.fake_irb = FAKE_CMD_IRB;
cdev->private->intparm = intparm;
return 0;
} else
@@ -605,6 +605,16 @@ int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
sch = to_subchannel(cdev->dev.parent);
if (!sch->schib.pmcw.ena)
return -EINVAL;
+ if (cdev->private->state == DEV_STATE_VERIFY) {
+ /* Remember to fake irb when finished. */
+ if (!cdev->private->flags.fake_irb) {
+ cdev->private->flags.fake_irb = FAKE_TM_IRB;
+ cdev->private->intparm = intparm;
+ return 0;
+ } else
+ /* There's already a fake I/O around. */
+ return -EBUSY;
+ }
if (cdev->private->state != DEV_STATE_ONLINE)
return -EIO;
/* Adjust requested path mask to exclude unusable paths. */
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