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Date: Fri, 8 Mar 2013 09:21:47 +0100
From: Samuel Iglesias Gonsalvez <siglesias@...lia.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: industrypack-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org,
Jens Taprogge <jens.taprogge@...rogge.org>,
Samuel Iglesias Gonsalvez <siglesias@...lia.com>
Subject: [PATCH 3/3] ipack: split ipack_device_register() in several functions
One function is ipack_device_init(). If it fails, the caller should execute
ipack_put_device().
The second function is ipack_device_add that only adds the device. If
it fails, the caller should execute ipack_put_device().
Then the device is removed with refcount = 0, as device_register() kernel
documentation says.
ipack_device_del() is added to remove the device.
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@...lia.com>
---
drivers/ipack/carriers/tpci200.c | 14 +++++++++++++-
drivers/ipack/ipack.c | 24 +++++++++++++----------
include/linux/ipack.h | 39 ++++++++++++++++++++++++++++----------
3 files changed, 56 insertions(+), 21 deletions(-)
diff --git a/drivers/ipack/carriers/tpci200.c b/drivers/ipack/carriers/tpci200.c
index 0246b1f..c276fde 100644
--- a/drivers/ipack/carriers/tpci200.c
+++ b/drivers/ipack/carriers/tpci200.c
@@ -480,6 +480,7 @@ static void tpci200_release_device(struct ipack_device *dev)
static int tpci200_create_device(struct tpci200_board *tpci200, int i)
{
+ int ret;
enum ipack_space space;
struct ipack_device *dev =
kzalloc(sizeof(struct ipack_device), GFP_KERNEL);
@@ -495,7 +496,18 @@ static int tpci200_create_device(struct tpci200_board *tpci200, int i)
+ tpci200_space_interval[space] * i;
dev->region[space].size = tpci200_space_size[space];
}
- return ipack_device_register(dev);
+
+ ret = ipack_device_init(dev);
+ if (ret < 0) {
+ ipack_put_device(dev);
+ return ret;
+ }
+
+ ret = ipack_device_add(dev);
+ if (ret < 0)
+ ipack_put_device(dev);
+
+ return ret;
}
static int tpci200_pci_probe(struct pci_dev *pdev,
diff --git a/drivers/ipack/ipack.c b/drivers/ipack/ipack.c
index bdac7f6..a26f371 100644
--- a/drivers/ipack/ipack.c
+++ b/drivers/ipack/ipack.c
@@ -228,7 +228,7 @@ static int ipack_unregister_bus_member(struct device *dev, void *data)
struct ipack_bus_device *bus = data;
if (idev->bus == bus)
- ipack_device_unregister(idev);
+ ipack_device_del(idev);
return 1;
}
@@ -420,7 +420,7 @@ out:
return ret;
}
-int ipack_device_register(struct ipack_device *dev)
+int ipack_device_init(struct ipack_device *dev)
{
int ret;
@@ -429,6 +429,7 @@ int ipack_device_register(struct ipack_device *dev)
dev->dev.parent = dev->bus->parent;
dev_set_name(&dev->dev,
"ipack-dev.%u.%u", dev->bus->bus_nr, dev->slot);
+ device_initialize(&dev->dev);
if (dev->bus->ops->set_clockrate(dev, 8))
dev_warn(&dev->dev, "failed to switch to 8 MHz operation for reading of device ID.\n");
@@ -448,19 +449,22 @@ int ipack_device_register(struct ipack_device *dev)
dev_err(&dev->dev, "failed to switch to 32 MHz operation.\n");
}
- ret = device_register(&dev->dev);
- if (ret < 0)
- kfree(dev->id);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ipack_device_init);
- return ret;
+int ipack_device_add(struct ipack_device *dev)
+{
+ return device_add(&dev->dev);
}
-EXPORT_SYMBOL_GPL(ipack_device_register);
+EXPORT_SYMBOL_GPL(ipack_device_add);
-void ipack_device_unregister(struct ipack_device *dev)
+void ipack_device_del(struct ipack_device *dev)
{
- device_unregister(&dev->dev);
+ device_del(&dev->dev);
+ ipack_put_device(dev);
}
-EXPORT_SYMBOL_GPL(ipack_device_unregister);
+EXPORT_SYMBOL_GPL(ipack_device_del);
void ipack_get_device(struct ipack_device *dev)
{
diff --git a/include/linux/ipack.h b/include/linux/ipack.h
index def91fd..1888e06 100644
--- a/include/linux/ipack.h
+++ b/include/linux/ipack.h
@@ -207,19 +207,38 @@ int ipack_driver_register(struct ipack_driver *edrv, struct module *owner,
void ipack_driver_unregister(struct ipack_driver *edrv);
/**
- * ipack_device_register -- register an IPack device with the kernel
- * @dev: the new device to register.
+ * ipack_device_init -- initialize an IPack device
+ * @dev: the new device to initialize.
*
- * Register a new IPack device ("module" in IndustryPack jargon). The call
- * is done by the carrier driver. The carrier should populate the fields
- * bus and slot as well as the region array of @dev prior to calling this
- * function. The rest of the fields will be allocated and populated
- * during registration.
+ * Initialize a new IPack device ("module" in IndustryPack jargon). The call
+ * is done by the carrier driver. The carrier should populate the fields
+ * bus and slot as well as the region array of @dev prior to calling this
+ * function. The rest of the fields will be allocated and populated
+ * during initalization.
*
- * Return zero on success or error code on failure.
+ * Return zero on success or error code on failure.
+ *
+ * NOTE: _Never_ directly free @dev after calling this function, even
+ * if it returned an error! Always use ipack_put_device() to give up the
+ * reference initialized in this function instead.
+ */
+int ipack_device_init(struct ipack_device *dev);
+
+/**
+ * ipack_device_add -- Add an IPack device
+ * @dev: the new device to add.
+ *
+ * Add a new IPack device. The call is done by the carrier driver
+ * after calling ipack_device_init().
+ *
+ * Return zero on success or error code on failure.
+ *
+ * NOTE: _Never_ directly free @dev after calling this function, even
+ * if it returned an error! Always use ipack_put_device() to give up the
+ * reference initialized in this function instead.
*/
-int ipack_device_register(struct ipack_device *dev);
-void ipack_device_unregister(struct ipack_device *dev);
+int ipack_device_add(struct ipack_device *dev);
+void ipack_device_del(struct ipack_device *dev);
void ipack_get_device(struct ipack_device *dev);
void ipack_put_device(struct ipack_device *dev);
--
1.7.10.4
--
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