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fpga: add devm_fpga_region_create

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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>
This commit is contained in:
Alan Tull 2018-10-15 17:20:03 -05:00 committed by Greg Kroah-Hartman
parent 213befe049
commit fea82b7f66
6 changed files with 70 additions and 20 deletions
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3
Documentation/driver-api/fpga/fpga-region.rst
View File

@ -89,6 +89,9 @@ API to add a new FPGA region
.. kernel-doc:: include/linux/fpga/fpga-region.h
:functions: fpga_region
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: devm_fpga_region_create
.. kernel-doc:: drivers/fpga/fpga-region.c
:functions: fpga_region_create

6
drivers/fpga/dfl-fme-region.c
View File

@ -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;

6
drivers/fpga/dfl.c
View File

@ -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);

65
drivers/fpga/fpga-region.c
View File

@ -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 @@ struct fpga_region
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);
}
/**

6
drivers/fpga/of-fpga-region.c
View File

@ -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;

4
include/linux/fpga/fpga-region.h
View File

@ -44,4 +44,8 @@ void fpga_region_free(struct fpga_region *region);
int fpga_region_register(struct fpga_region *region);
void fpga_region_unregister(struct fpga_region *region);
struct fpga_region
*devm_fpga_region_create(struct device *dev, struct fpga_manager *mgr,
int (*get_bridges)(struct fpga_region *));
#endif /* _FPGA_REGION_H */