[S390] cio: update descriptor in chsc_chp_vary

Update the channel path descriptor at the beginning of to the
vary_on operation.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/s390/cio/chp.h b/drivers/s390/cio/chp.h
index 695ec20f1c59..12b4903d6fe3 100644
--- a/drivers/s390/cio/chp.h
+++ b/drivers/s390/cio/chp.h
@@ -52,6 +52,12 @@ struct channel_path {
         void *cmg_chars;
 };
 
+/* Return channel_path struct for given chpid. */
+static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
+{
+        return channel_subsystems[chpid.cssid]->chps[chpid.id];
+}
+
 int chp_get_status(struct chp_id chpid);
 u8 chp_get_sch_opm(struct subchannel *sch);
 int chp_is_registered(struct chp_id chpid);