[S390] cio: replace subchannel evaluation queue with bitmap

Use a bitmap for indicating which subchannels require evaluation
instead of allocating memory for each evaluation request. This
approach reduces memory consumption during recovery in case of
massive evaluation request occurrence and removes the need for
memory allocation failure handling.

Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index d6226881d0df..898ec3b2bebb 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -222,10 +222,8 @@ __recover_lost_chpids(struct subchannel *sch, int old_lpm)
                 if (old_lpm & mask)
                         continue;
                 chpid.id = sch->schib.pmcw.chpid[i];
-                if (!chp_is_registered(chpid)) {
-                        need_rescan = 1;
-                        queue_work(slow_path_wq, &slow_path_work);
-                }
+                if (!chp_is_registered(chpid))
+                        css_schedule_eval_all();
         }
 }