[S390] cio: introduce subchannel todos

Ensure that current and future users of sch->work do not overwrite
each other by introducing a single mechanism for delayed subchannel
work.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 2e43558c704b..bf7f80f5a330 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -68,6 +68,11 @@ struct schib {
         __u8 mda[4];             /* model dependent area */
 } __attribute__ ((packed,aligned(4)));
 
+enum sch_todo {
+        SCH_TODO_NOTHING,
+        SCH_TODO_UNREG,
+};
+
 /* subchannel data structure used by I/O subroutines */
 struct subchannel {
         struct subchannel_id schid;
@@ -95,7 +100,8 @@ struct subchannel {
         struct device dev;      /* entry in device tree */
         struct css_driver *driver;
         void *private; /* private per subchannel type data */
-        struct work_struct work;
+        enum sch_todo todo;
+        struct work_struct todo_work;
         struct schib_config config;
 } __attribute__ ((aligned(8)));