[S390] subchannel lock conversion.

Convert the subchannel lock to a pointer to a lock.  Needed for the dynamic
subchannel mapping patch.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 41 insertions, 17 deletions

diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index 20aee2783847..e8d331493fd8 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -143,11 +143,11 @@ cio_tpi(void)
                 return 1;
         local_bh_disable();
         irq_enter ();
-        spin_lock(&sch->lock);
+        spin_lock(sch->lock);
         memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
         if (sch->driver && sch->driver->irq)
                 sch->driver->irq(&sch->dev);
-        spin_unlock(&sch->lock);
+        spin_unlock(sch->lock);
         irq_exit ();
         _local_bh_enable();
         return 1;
@@ -496,6 +496,15 @@ cio_disable_subchannel (struct subchannel *sch)
         return ret;
 }
 
+static int cio_create_sch_lock(struct subchannel *sch)
+{
+        sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
+        if (!sch->lock)
+                return -ENOMEM;
+        spin_lock_init(sch->lock);
+        return 0;
+}
+
 /*
  * cio_validate_subchannel()
  *
@@ -513,6 +522,7 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
 {
         char dbf_txt[15];
         int ccode;
+        int err;
 
         sprintf (dbf_txt, "valsch%x", schid.sch_no);
         CIO_TRACE_EVENT (4, dbf_txt);
@@ -520,9 +530,15 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
         /* Nuke all fields. */
         memset(sch, 0, sizeof(struct subchannel));
 
-        spin_lock_init(&sch->lock);
+        sch->schid = schid;
+        if (cio_is_console(schid)) {
+                sch->lock = cio_get_console_lock();
+        } else {
+                err = cio_create_sch_lock(sch);
+                if (err)
+                        goto out;
+        }
         mutex_init(&sch->reg_mutex);
-
         /* Set a name for the subchannel */
         snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
                   schid.sch_no);
@@ -534,10 +550,10 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
          *  is not valid.
          */
         ccode = stsch_err (schid, &sch->schib);
-        if (ccode)
-                return (ccode == 3) ? -ENXIO : ccode;
-
-        sch->schid = schid;
+        if (ccode) {
+                err = (ccode == 3) ? -ENXIO : ccode;
+                goto out;
+        }
         /* Copy subchannel type from path management control word. */
         sch->st = sch->schib.pmcw.st;
 
@@ -550,14 +566,16 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
                           "non-I/O subchannel type %04X\n",
                           sch->schid.ssid, sch->schid.sch_no, sch->st);
                 /* We stop here for non-io subchannels. */
-                return sch->st;
+                err = sch->st;
+                goto out;
         }
 
         /* Initialization for io subchannels. */
-        if (!sch->schib.pmcw.dnv)
+        if (!sch->schib.pmcw.dnv) {
                 /* io subchannel but device number is invalid. */
-                return -ENODEV;
-
+                err = -ENODEV;
+                goto out;
+        }
         /* Devno is valid. */
         if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
                 /*
@@ -567,7 +585,8 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
                 CIO_MSG_EVENT(0, "Blacklisted device detected "
                               "at devno %04X, subchannel set %x\n",
                               sch->schib.pmcw.dev, sch->schid.ssid);
-                return -ENODEV;
+                err = -ENODEV;
+                goto out;
         }
         sch->opm = 0xff;
         if (!cio_is_console(sch->schid))
@@ -595,6 +614,11 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
         if ((sch->lpm & (sch->lpm - 1)) != 0)
                 sch->schib.pmcw.mp = 1; /* multipath mode */
         return 0;
+out:
+        if (!cio_is_console(schid))
+                kfree(sch->lock);
+        sch->lock = NULL;
+        return err;
 }
 
 /*
@@ -637,7 +661,7 @@ do_IRQ (struct pt_regs *regs)
                 }
                 sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
                 if (sch)
-                        spin_lock(&sch->lock);
+                        spin_lock(sch->lock);
                 /* Store interrupt response block to lowcore. */
                 if (tsch (tpi_info->schid, irb) == 0 && sch) {
                         /* Keep subchannel information word up to date. */
@@ -648,7 +672,7 @@ do_IRQ (struct pt_regs *regs)
                                 sch->driver->irq(&sch->dev);
                 }
                 if (sch)
-                        spin_unlock(&sch->lock);
+                        spin_unlock(sch->lock);
                 /*
                  * Are more interrupts pending?
                  * If so, the tpi instruction will update the lowcore
@@ -687,10 +711,10 @@ wait_cons_dev (void)
         __ctl_load (cr6, 6, 6);
 
         do {
-                spin_unlock(&console_subchannel.lock);
+                spin_unlock(console_subchannel.lock);
                 if (!cio_tpi())
                         cpu_relax();
-                spin_lock(&console_subchannel.lock);
+                spin_lock(console_subchannel.lock);
         } while (console_subchannel.schib.scsw.actl != 0);
         /*
          * restore previous isc value