[POWERPC] iSeries: Simplify viocd initialisation

We don't need to keep a lump of dma coherent memory around for the life
of the module.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 13 insertions, 24 deletions

diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index e51550db1575..b88fdebe77f6 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -136,17 +136,12 @@ struct cdrom_info {
         char    type[4];
         char    model[3];
 };
-/*
- * This needs to be allocated since it is passed to the
- * Hypervisor and we may be a module.
- */
-static struct cdrom_info *viocd_unitinfo;
-static dma_addr_t unitinfo_dmaaddr;
 
 struct disk_info {
         struct gendisk                  *viocd_disk;
         struct cdrom_device_info        viocd_info;
         struct device                   *dev;
+        struct cdrom_info               unitinfo;
 };
 static struct disk_info viocd_diskinfo[VIOCD_MAX_CD];
 
@@ -164,9 +159,9 @@ static int proc_viocd_show(struct seq_file *m, void *v)
         for (i = 0; i < viocd_numdev; i++) {
                 seq_printf(m, "viocd device %d is iSeries resource %10.10s"
                                 "type %4.4s, model %3.3s\n",
-                                i, viocd_unitinfo[i].rsrcname,
-                                viocd_unitinfo[i].type,
-                                viocd_unitinfo[i].model);
+                                i, viocd_diskinfo[i].unitinfo.rsrcname,
+                                viocd_diskinfo[i].unitinfo.type,
+                                viocd_diskinfo[i].unitinfo.model);
         }
         return 0;
 }
@@ -222,6 +217,8 @@ static void __init get_viocd_info(void)
         HvLpEvent_Rc hvrc;
         int i;
         struct viocd_waitevent we;
+        struct cdrom_info *viocd_unitinfo;
+        dma_addr_t unitinfo_dmaaddr;
 
         viocd_unitinfo = dma_alloc_coherent(iSeries_vio_dev,
                         sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
@@ -259,16 +256,15 @@ static void __init get_viocd_info(void)
                 goto error_ret;
         }
 
-        for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++)
+        for (i = 0; (i < VIOCD_MAX_CD) && viocd_unitinfo[i].rsrcname[0]; i++) {
+                viocd_diskinfo[viocd_numdev].unitinfo = viocd_unitinfo[i];
                 viocd_numdev++;
+        }
 
 error_ret:
-        if (viocd_numdev == 0) {
-                dma_free_coherent(iSeries_vio_dev,
-                                sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
-                                viocd_unitinfo, unitinfo_dmaaddr);
-                viocd_unitinfo = NULL;
-        }
+        dma_free_coherent(iSeries_vio_dev,
+                        sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
+                        viocd_unitinfo, unitinfo_dmaaddr);
 }
 
 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
@@ -674,7 +670,7 @@ static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 
         d = &viocd_diskinfo[deviceno];
         c = &d->viocd_info;
-        ci = &viocd_unitinfo[deviceno];
+        ci = &d->unitinfo;
 
         c->ops = &viocd_dops;
         c->speed = 4;
@@ -816,9 +812,6 @@ static int __init viocd_init(void)
         return 0;
 
 out_free_info:
-        dma_free_coherent(iSeries_vio_dev,
-                        sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
-                        viocd_unitinfo, unitinfo_dmaaddr);
         vio_clearHandler(viomajorsubtype_cdio);
         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
 out_unregister:
@@ -830,10 +823,6 @@ static void __exit viocd_exit(void)
 {
         remove_proc_entry("iSeries/viocd", NULL);
         vio_unregister_driver(&viocd_driver);
-        if (viocd_unitinfo != NULL)
-                dma_free_coherent(iSeries_vio_dev,
-                                sizeof(*viocd_unitinfo) * VIOCD_MAX_CD,
-                                viocd_unitinfo, unitinfo_dmaaddr);
         viopath_close(viopath_hostLp, viomajorsubtype_cdio, MAX_CD_REQ + 2);
         vio_clearHandler(viomajorsubtype_cdio);
         unregister_blkdev(VIOCD_MAJOR, VIOCD_DEVICE);