Looks good to me.
Reviewed-by: Xu Yilun <yilun.xu@xxxxxxxxx>
On Wed, Jun 09, 2021 at 03:11:33PM -0700, Russ Weight wrote:
> The FPGA manager class driver data structure is being treated as a
> managed resource instead of using the class.dev_release call-back
> function to release the class data structure. This change populates
> the class.dev_release function, changes the fpga_mgr_free() function
> to call put_device() and changes the fpga_mgr_unregister() function
> to call device_del() instead of device_unregister().
>
> Signed-off-by: Russ Weight <russell.h.weight@xxxxxxxxx>
> ---
> v2:
> - Moved the renaming of "dev" to "parent" to a separate patch
> - Call fpga_mgr_free() in devm_fpga_mgr_release() instead of put_device()
> ---
> drivers/fpga/fpga-mgr.c | 35 +++++++++++++++--------------------
> 1 file changed, 15 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
> index 42ddc0844781..9f6c3760b6ff 100644
> --- a/drivers/fpga/fpga-mgr.c
> +++ b/drivers/fpga/fpga-mgr.c
> @@ -585,8 +585,10 @@ struct fpga_manager *fpga_mgr_create(struct device *parent, const char *name,
> return NULL;
>
> id = ida_simple_get(&fpga_mgr_ida, 0, 0, GFP_KERNEL);
> - if (id < 0)
> - goto error_kfree;
> + if (id < 0) {
> + kfree(mgr);
> + return NULL;
> + }
>
> mutex_init(&mgr->ref_mutex);
>
> @@ -602,17 +604,12 @@ struct fpga_manager *fpga_mgr_create(struct device *parent, const char *name,
> mgr->dev.id = id;
>
> ret = dev_set_name(&mgr->dev, "fpga%d", id);
> - if (ret)
> - goto error_device;
> + if (ret) {
> + put_device(&mgr->dev);
> + return NULL;
> + }
>
> return mgr;
> -
> -error_device:
> - ida_simple_remove(&fpga_mgr_ida, id);
> -error_kfree:
> - kfree(mgr);
> -
> - return NULL;
> }
> EXPORT_SYMBOL_GPL(fpga_mgr_create);
>
> @@ -622,8 +619,7 @@ EXPORT_SYMBOL_GPL(fpga_mgr_create);
> */
> void fpga_mgr_free(struct fpga_manager *mgr)
> {
> - ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
> - kfree(mgr);
> + put_device(&mgr->dev);
> }
> EXPORT_SYMBOL_GPL(fpga_mgr_free);
>
> @@ -692,16 +688,11 @@ int fpga_mgr_register(struct fpga_manager *mgr)
>
> ret = device_add(&mgr->dev);
> if (ret)
> - goto error_device;
> + return ret;
>
> dev_info(&mgr->dev, "%s registered\n", mgr->name);
>
> return 0;
> -
> -error_device:
> - ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
> -
> - return ret;
> }
> EXPORT_SYMBOL_GPL(fpga_mgr_register);
>
> @@ -722,7 +713,7 @@ void fpga_mgr_unregister(struct fpga_manager *mgr)
> if (mgr->mops->fpga_remove)
> mgr->mops->fpga_remove(mgr);
>
> - device_unregister(&mgr->dev);
> + device_del(&mgr->dev);
> }
> EXPORT_SYMBOL_GPL(fpga_mgr_unregister);
>
> @@ -781,6 +772,10 @@ EXPORT_SYMBOL_GPL(devm_fpga_mgr_register);
>
> static void fpga_mgr_dev_release(struct device *dev)
> {
> + struct fpga_manager *mgr = to_fpga_manager(dev);
> +
> + ida_simple_remove(&fpga_mgr_ida, mgr->dev.id);
> + kfree(mgr);
> }
>
> static int __init fpga_mgr_class_init(void)
> --
> 2.25.1
