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authorAlan Tull <atull@kernel.org>2018-10-15 22:20:03 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-10-16 09:13:50 (GMT)
commitfea82b7f6670002ff36bf1bc77d0345b0b2f2d1c (patch)
treeeeed3d9f54d90d5f01ea84e1ebdd2d05b3553667 /drivers/fpga
parent213befe049c70cfcfcbb4f6010bd5276dbc1f7b9 (diff)
fpga: add devm_fpga_region_create
Add devm_fpga_region_create() which is the managed version of fpga_region_create(). Change current region drivers to use devm_fpga_region_create(). Signed-off-by: Alan Tull <atull@kernel.org> Suggested-by: Federico Vaga <federico.vaga@cern.ch> Acked-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/dfl-fme-region.c6
-rw-r--r--drivers/fpga/dfl.c6
-rw-r--r--drivers/fpga/fpga-region.c65
-rw-r--r--drivers/fpga/of-fpga-region.c6
4 files changed, 63 insertions, 20 deletions
diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c
index 51a5ac2..ec134ec 100644
--- a/drivers/fpga/dfl-fme-region.c
+++ b/drivers/fpga/dfl-fme-region.c
@@ -39,7 +39,7 @@ static int fme_region_probe(struct platform_device *pdev)
if (IS_ERR(mgr))
return -EPROBE_DEFER;
- region = fpga_region_create(dev, mgr, fme_region_get_bridges);
+ region = devm_fpga_region_create(dev, mgr, fme_region_get_bridges);
if (!region) {
ret = -ENOMEM;
goto eprobe_mgr_put;
@@ -51,14 +51,12 @@ static int fme_region_probe(struct platform_device *pdev)
ret = fpga_region_register(region);
if (ret)
- goto region_free;
+ goto eprobe_mgr_put;
dev_dbg(dev, "DFL FME FPGA Region probed\n");
return 0;
-region_free:
- fpga_region_free(region);
eprobe_mgr_put:
fpga_mgr_put(mgr);
return ret;
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index a9b521b..2c09e50 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -899,7 +899,7 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info)
if (!cdev)
return ERR_PTR(-ENOMEM);
- cdev->region = fpga_region_create(info->dev, NULL, NULL);
+ cdev->region = devm_fpga_region_create(info->dev, NULL, NULL);
if (!cdev->region) {
ret = -ENOMEM;
goto free_cdev_exit;
@@ -911,7 +911,7 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info)
ret = fpga_region_register(cdev->region);
if (ret)
- goto free_region_exit;
+ goto free_cdev_exit;
/* create and init build info for enumeration */
binfo = devm_kzalloc(info->dev, sizeof(*binfo), GFP_KERNEL);
@@ -942,8 +942,6 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info)
unregister_region_exit:
fpga_region_unregister(cdev->region);
-free_region_exit:
- fpga_region_free(cdev->region);
free_cdev_exit:
devm_kfree(info->dev, cdev);
return ERR_PTR(ret);
diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 0d65220..bde5a9d 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -185,6 +185,10 @@ ATTRIBUTE_GROUPS(fpga_region);
* @mgr: manager that programs this region
* @get_bridges: optional function to get bridges to a list
*
+ * The caller of this function is responsible for freeing the resulting region
+ * struct with fpga_region_free(). Using devm_fpga_region_create() instead is
+ * recommended.
+ *
* Return: struct fpga_region or NULL
*/
struct fpga_region
@@ -230,8 +234,8 @@ err_free:
EXPORT_SYMBOL_GPL(fpga_region_create);
/**
- * fpga_region_free - free a struct fpga_region
- * @region: FPGA region created by fpga_region_create
+ * fpga_region_free - free a FPGA region created by fpga_region_create()
+ * @region: FPGA region
*/
void fpga_region_free(struct fpga_region *region)
{
@@ -240,21 +244,69 @@ void fpga_region_free(struct fpga_region *region)
}
EXPORT_SYMBOL_GPL(fpga_region_free);
+static void devm_fpga_region_release(struct device *dev, void *res)
+{
+ struct fpga_region *region = *(struct fpga_region **)res;
+
+ fpga_region_free(region);
+}
+
+/**
+ * devm_fpga_region_create - create and initialize a managed FPGA region struct
+ * @dev: device parent
+ * @mgr: manager that programs this region
+ * @get_bridges: optional function to get bridges to a list
+ *
+ * This function is intended for use in a FPGA region driver's probe function.
+ * After the region driver creates the region struct with
+ * devm_fpga_region_create(), it should register it with fpga_region_register().
+ * The region driver's remove function should call fpga_region_unregister().
+ * The region struct allocated with this function will be freed automatically on
+ * driver detach. This includes the case of a probe function returning error
+ * before calling fpga_region_register(), the struct will still get cleaned up.
+ *
+ * Return: struct fpga_region or NULL
+ */
+struct fpga_region
+*devm_fpga_region_create(struct device *dev,
+ struct fpga_manager *mgr,
+ int (*get_bridges)(struct fpga_region *))
+{
+ struct fpga_region **ptr, *region;
+
+ ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return NULL;
+
+ region = fpga_region_create(dev, mgr, get_bridges);
+ if (!region) {
+ devres_free(ptr);
+ } else {
+ *ptr = region;
+ devres_add(dev, ptr);
+ }
+
+ return region;
+}
+EXPORT_SYMBOL_GPL(devm_fpga_region_create);
+
/**
* fpga_region_register - register a FPGA region
- * @region: FPGA region created by fpga_region_create
+ * @region: FPGA region
+ *
* Return: 0 or -errno
*/
int fpga_region_register(struct fpga_region *region)
{
return device_add(&region->dev);
-
}
EXPORT_SYMBOL_GPL(fpga_region_register);
/**
- * fpga_region_unregister - unregister and free a FPGA region
+ * fpga_region_unregister - unregister a FPGA region
* @region: FPGA region
+ *
+ * This function is intended for use in a FPGA region driver's remove function.
*/
void fpga_region_unregister(struct fpga_region *region)
{
@@ -264,9 +316,6 @@ EXPORT_SYMBOL_GPL(fpga_region_unregister);
static void fpga_region_dev_release(struct device *dev)
{
- struct fpga_region *region = to_fpga_region(dev);
-
- fpga_region_free(region);
}
/**
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 052a134..122286f 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -410,7 +410,7 @@ static int of_fpga_region_probe(struct platform_device *pdev)
if (IS_ERR(mgr))
return -EPROBE_DEFER;
- region = fpga_region_create(dev, mgr, of_fpga_region_get_bridges);
+ region = devm_fpga_region_create(dev, mgr, of_fpga_region_get_bridges);
if (!region) {
ret = -ENOMEM;
goto eprobe_mgr_put;
@@ -418,7 +418,7 @@ static int of_fpga_region_probe(struct platform_device *pdev)
ret = fpga_region_register(region);
if (ret)
- goto eprobe_free;
+ goto eprobe_mgr_put;
of_platform_populate(np, fpga_region_of_match, NULL, &region->dev);
dev_set_drvdata(dev, region);
@@ -427,8 +427,6 @@ static int of_fpga_region_probe(struct platform_device *pdev)
return 0;
-eprobe_free:
- fpga_region_free(region);
eprobe_mgr_put:
fpga_mgr_put(mgr);
return ret;

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