[PATCH 01/10] fpga: fpga-mgr: Add devm_fpga_mgr_register() API

Moritz Fischer
2020-10-04T05:14:51Z

Add a devm_fpga_mgr_register() API that can be used to register a FPGA
Manager that was created using devm_fpga_mgr_create().

Introduce a struct fpga_mgr_devres that makes the devres
allocation a little bit more readable and gets reused for
devm_fpga_mgr_create() devm_fpga_mgr_register().

Signed-off-by: Moritz Fischer <mdf@kernel.org>
---
drivers/fpga/fpga-mgr.c | 76 ++++++++++++++++++++++++++++++-----
include/linux/fpga/fpga-mgr.h | 2 +
2 files changed, 68 insertions(+), 10 deletions(-)

diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index f38bab01432e..774ac98fb69c 100644
--- a/drivers/fpga/fpga-mgr.c
+++ b/drivers/fpga/fpga-mgr.c
@@ -21,6 +21,10 @@
static DEFINE_IDA(fpga_mgr_ida);
static struct class *fpga_mgr_class;

+struct fpga_mgr_devres {
+ struct fpga_manager *mgr;
+};
+
/**
* fpga_image_info_alloc - Allocate a FPGA image info struct
* @dev: owning device
@@ -651,21 +655,21 @@ struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
const struct fpga_manager_ops *mops,
void *priv)
{
- struct fpga_manager **ptr, *mgr;
+ struct fpga_mgr_devres *dr;

- ptr = devres_alloc(devm_fpga_mgr_release, sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
+ dr = devres_alloc(devm_fpga_mgr_release, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
return NULL;

- mgr = fpga_mgr_create(dev, name, mops, priv);
- if (!mgr) {
- devres_free(ptr);
- } else {
- *ptr = mgr;
- devres_add(dev, ptr);
+ dr->mgr = fpga_mgr_create(dev, name, mops, priv);
+ if (!dr->mgr) {
+ devres_free(dr);
+ return NULL;
}

- return mgr;
+ devres_add(dev, dr);
+
+ return dr->mgr;
}
EXPORT_SYMBOL_GPL(devm_fpga_mgr_create);

@@ -722,6 +726,58 @@ void fpga_mgr_unregister(struct fpga_manager *mgr)
}
EXPORT_SYMBOL_GPL(fpga_mgr_unregister);

+static int fpga_mgr_devres_match(struct device *dev, void *priv,
+ void *match_data)
+{
+ struct fpga_mgr_devres *dr = priv;
+
+ return match_data == dr->mgr;
+}
+
+static void devm_fpga_mgr_unregister(struct device *dev, void *priv)
+{
+ struct fpga_mgr_devres *dr = priv;
+
+ fpga_mgr_unregister(dr->mgr);
+}
+
+/**
+ * devm_fpga_mgr_register - resource managed variant of fpga_mgr_register()
+ * @dev: managing device for this FPGA manager
+ * @mgr: fpga manager struct
+ *
+ * This is the devres variant of fpga_mgr_register() for which the unregister
+ * function will be called automatically when the managing device is detached.
+ */
+int devm_fpga_mgr_register(struct device *dev, struct fpga_manager *mgr)
+{
+ struct fpga_mgr_devres *dr;
+ int err;
+
+ /* Make sure that the struct fpga_manager * that is passed in is
+ * managed itself.
+ */
+ if (WARN_ON(!devres_find(dev, devm_fpga_mgr_release,
+ fpga_mgr_devres_match, mgr)))
+ return -EINVAL;
+
+ dr = devres_alloc(devm_fpga_mgr_unregister, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ err = fpga_mgr_register(mgr);
+ if (err) {
+ devres_free(dr);
+ return err;
+ }
+
+ dr->mgr = mgr;
+ devres_add(dev, dr);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_fpga_mgr_register);
+
static void fpga_mgr_dev_release(struct device *dev)
{
}
diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
index e8ca62b2cb5b..2bc3030a69e5 100644
--- a/include/linux/fpga/fpga-mgr.h
+++ b/include/linux/fpga/fpga-mgr.h
@@ -198,6 +198,8 @@ void fpga_mgr_free(struct fpga_manager *mgr);
int fpga_mgr_register(struct fpga_manager *mgr);
void fpga_mgr_unregister(struct fpga_manager *mgr);

+int devm_fpga_mgr_register(struct device *dev, struct fpga_manager *mgr);
+
struct fpga_manager *devm_fpga_mgr_create(struct device *dev, const char *name,
const struct fpga_manager_ops *mops,
void *priv);
--
2.28.0