device-dax: Kill dax_region ida

Commit bbb3be170ac2 "device-dax: fix sysfs duplicate warnings" arranged
for passing a dax instance-id to devm_create_dax_dev(), rather than
generating one internally. Remove the dax_region ida and related code.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 3 insertions, 21 deletions

diff --git a/drivers/dax/device.c b/drivers/dax/device.c
index 948806e57cee..a5a670c1cd58 100644
--- a/drivers/dax/device.c
+++ b/drivers/dax/device.c
@@ -128,7 +128,6 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
         dax_region->pfn_flags = pfn_flags;
         kref_init(&dax_region->kref);
         dax_region->id = region_id;
-        ida_init(&dax_region->ida);
         dax_region->align = align;
         dax_region->dev = parent;
         dax_region->base = addr;
@@ -582,8 +581,6 @@ static void dev_dax_release(struct device *dev)
         struct dax_region *dax_region = dev_dax->region;
         struct dax_device *dax_dev = dev_dax->dax_dev;
 
-        if (dev_dax->id >= 0)
-                ida_simple_remove(&dax_region->ida, dev_dax->id);
         dax_region_put(dax_region);
         put_dax(dax_dev);
         kfree(dev_dax);
@@ -642,19 +639,7 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
         }
 
         if (i < count)
-                goto err_id;
-
-        if (id < 0) {
-                id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
-                dev_dax->id = id;
-                if (id < 0) {
-                        rc = id;
-                        goto err_id;
-                }
-        } else {
-                /* region provider owns @id lifetime */
-                dev_dax->id = -1;
-        }
+                goto err;
 
         /*
          * No 'host' or dax_operations since there is no access to this
@@ -663,7 +648,7 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
         dax_dev = alloc_dax(dev_dax, NULL, NULL);
         if (!dax_dev) {
                 rc = -ENOMEM;
-                goto err_dax;
+                goto err;
         }
 
         /* from here on we're committed to teardown via dax_dev_release() */
@@ -700,10 +685,7 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
 
         return dev_dax;
 
- err_dax:
-        if (dev_dax->id >= 0)
-                ida_simple_remove(&dax_region->ida, dev_dax->id);
- err_id:
+ err:
         kfree(dev_dax);
 
         return ERR_PTR(rc);