dax: convert devm_create_dax_dev to PTR_ERR

For sub-division support we need access to the dax_dev created by
devm_create_dax_dev().

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

diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index 03bb54f..e7d8a39 100644 (file)
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -558,8 +558,8 @@ static void unregister_dax_dev(void *dev)
        device_unregister(dev);
 }
 
-int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
-               int count)
+struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
+               struct resource *res, int count)
 {
        struct device *parent = dax_region->dev;
        struct dax_dev *dax_dev;
@@ -570,7 +570,7 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
 
        dax_dev = kzalloc(sizeof(*dax_dev) + sizeof(*res) * count, GFP_KERNEL);
        if (!dax_dev)
-               return -ENOMEM;
+               return ERR_PTR(-ENOMEM);
 
        for (i = 0; i < count; i++) {
                if (!IS_ALIGNED(res[i].start, dax_region->align)
@@ -632,10 +632,14 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
        rc = device_add(dev);
        if (rc) {
                put_device(dev);
-               return rc;
+               return ERR_PTR(rc);
        }
 
-       return devm_add_action_or_reset(dax_region->dev, unregister_dax_dev, dev);
+       rc = devm_add_action_or_reset(dax_region->dev, unregister_dax_dev, dev);
+       if (rc)
+               return ERR_PTR(rc);
+
+       return dax_dev;
 
  err_cdev:
        iput(dax_dev->inode);
@@ -646,7 +650,7 @@ int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
  err_id:
        kfree(dax_dev);
 
-       return rc;
+       return ERR_PTR(rc);
 }
 EXPORT_SYMBOL_GPL(devm_create_dax_dev);
 

diff --git a/drivers/dax/dax.h b/drivers/dax/dax.h
index d8b8f1f..ddd829a 100644 (file)
--- a/drivers/dax/dax.h
+++ b/drivers/dax/dax.h
@@ -13,12 +13,13 @@
 #ifndef __DAX_H__
 #define __DAX_H__
 struct device;
+struct dax_dev;
 struct resource;
 struct dax_region;
 void dax_region_put(struct dax_region *dax_region);
 struct dax_region *alloc_dax_region(struct device *parent,
                int region_id, struct resource *res, unsigned int align,
                void *addr, unsigned long flags);
-int devm_create_dax_dev(struct dax_region *dax_region, struct resource *res,
-               int count);
+struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
+               struct resource *res, int count);
 #endif /* __DAX_H__ */

diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
index 59b75c5..c24d32e 100644 (file)
--- a/drivers/dax/pmem.c
+++ b/drivers/dax/pmem.c
@@ -61,6 +61,7 @@ static int dax_pmem_probe(struct device *dev)
        int rc;
        void *addr;
        struct resource res;
+       struct dax_dev *dax_dev;
        struct nd_pfn_sb *pfn_sb;
        struct dax_pmem *dax_pmem;
        struct nd_region *nd_region;
@@ -123,12 +124,12 @@ static int dax_pmem_probe(struct device *dev)
                return -ENOMEM;
 
        /* TODO: support for subdividing a dax region... */
-       rc = devm_create_dax_dev(dax_region, &res, 1);
+       dax_dev = devm_create_dax_dev(dax_region, &res, 1);
 
        /* child dax_dev instances now own the lifetime of the dax_region */
        dax_region_put(dax_region);
 
-       return rc;
+       return PTR_ERR_OR_ZERO(dax_dev);
 }
 
 static struct nd_device_driver dax_pmem_driver = {