[PATCH] s390: re-activated path detection

If we receive path not operational indications (pnom in pmcw nonzero), we
switch off those paths.  To catch them becoming available again, we have to
recalculate the lpm from the pmcw each time we start path verification.

Signed-off-by: Cornelia Huck <cohuck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 0adac8a67331..757b2706d5a9 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -22,6 +22,7 @@
 #include "cio_debug.h"
 #include "css.h"
 #include "device.h"
+#include "ioasm.h"
 
 /*
  * Start Sense Path Group ID helper function. Used in ccw_device_recog
@@ -364,8 +365,22 @@ ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
 void
 ccw_device_verify_start(struct ccw_device *cdev)
 {
+        struct subchannel *sch = to_subchannel(cdev->dev.parent);
+
         cdev->private->flags.pgid_single = 0;
         cdev->private->iretry = 5;
+        /*
+         * Update sch->lpm with current values to catch paths becoming
+         * available again.
+         */
+        if (stsch(sch->irq, &sch->schib)) {
+                ccw_device_verify_done(cdev, -ENODEV);
+                return;
+        }
+        sch->lpm = sch->schib.pmcw.pim &
+                sch->schib.pmcw.pam &
+                sch->schib.pmcw.pom &
+                sch->opm;
         __ccw_device_verify_start(cdev);
 }