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authorMoritz Fischer <mdf@kernel.org>2020-11-15 11:51:18 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-12-01 18:49:32 +0100
commit57d9352b6c651b090179f8b223b6681275c64a4f (patch)
tree41fdd92dba396c0b718c4b849eb1d8bc28f06395 /drivers/fpga
parentcd5f82dbbad04418afca092e8c7c6250e6815554 (diff)
fpga: fpga-mgr: Add devm_fpga_mgr_register() API
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(). Reviewed-by: Tom Rix <trix@redhat.com> Signed-off-by: Moritz Fischer <mdf@kernel.org> Link: https://lore.kernel.org/r/20201115195127.284487-2-mdf@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/fpga-mgr.c81
1 files changed, 69 insertions, 12 deletions
diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
index f38bab01432e..b85bc47c91a9 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
@@ -625,9 +629,9 @@ EXPORT_SYMBOL_GPL(fpga_mgr_free);
static void devm_fpga_mgr_release(struct device *dev, void *res)
{
- struct fpga_manager *mgr = *(struct fpga_manager **)res;
+ struct fpga_mgr_devres *dr = res;
- fpga_mgr_free(mgr);
+ fpga_mgr_free(dr->mgr);
}
/**
@@ -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 +726,59 @@ void fpga_mgr_unregister(struct fpga_manager *mgr)
}
EXPORT_SYMBOL_GPL(fpga_mgr_unregister);
+static int fpga_mgr_devres_match(struct device *dev, void *res,
+ void *match_data)
+{
+ struct fpga_mgr_devres *dr = res;
+
+ return match_data == dr->mgr;
+}
+
+static void devm_fpga_mgr_unregister(struct device *dev, void *res)
+{
+ struct fpga_mgr_devres *dr = res;
+
+ 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 ret;
+
+ /*
+ * 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;
+
+ ret = fpga_mgr_register(mgr);
+ if (ret) {
+ devres_free(dr);
+ return ret;
+ }
+
+ 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)
{
}