[S390] cio: fix subchannel channel-path data usage

[pandora-kernel.git] / drivers / s390 / cio / css.c

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index fcc641e..27c6d9e 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -21,6 +21,7 @@
 #include "chsc.h"
 #include "device.h"
 #include "idset.h"
+#include "chp.h"
 
 int css_init_done = 0;
 static int need_reprobe = 0;
@@ -125,8 +126,52 @@ void css_sch_device_unregister(struct subchannel *sch)
        mutex_unlock(&sch->reg_mutex);
 }
 
-static int
-css_register_subchannel(struct subchannel *sch)
+static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
+{
+       int i;
+       int mask;
+
+       memset(ssd, 0, sizeof(struct chsc_ssd_info));
+       ssd->path_mask = pmcw->pim;
+       for (i = 0; i < 8; i++) {
+               mask = 0x80 >> i;
+               if (pmcw->pim & mask) {
+                       chp_id_init(&ssd->chpid[i]);
+                       ssd->chpid[i].id = pmcw->chpid[i];
+               }
+       }
+}
+
+static void ssd_register_chpids(struct chsc_ssd_info *ssd)
+{
+       int i;
+       int mask;
+
+       for (i = 0; i < 8; i++) {
+               mask = 0x80 >> i;
+               if (ssd->path_mask & mask)
+                       if (!chp_is_registered(ssd->chpid[i]))
+                               chp_new(ssd->chpid[i]);
+       }
+}
+
+void css_update_ssd_info(struct subchannel *sch)
+{
+       int ret;
+
+       if (cio_is_console(sch->schid)) {
+               /* Console is initialized too early for functions requiring
+                * memory allocation. */
+               ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
+       } else {
+               ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
+               if (ret)
+                       ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
+               ssd_register_chpids(&sch->ssd_info);
+       }
+}
+
+static int css_register_subchannel(struct subchannel *sch)
 {
        int ret;
 
@@ -135,9 +180,7 @@ css_register_subchannel(struct subchannel *sch)
        sch->dev.bus = &css_bus_type;
        sch->dev.release = &css_subchannel_release;
        sch->dev.groups = subch_attr_groups;
-
-       css_get_ssd_info(sch);
-
+       css_update_ssd_info(sch);
        /* make it known to the system */
        ret = css_sch_device_register(sch);
        if (ret) {