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Date: Tue, 24 Jul 2007 15:39:52 -0700
From: bphilips@...e.de
To: netdev@...r.kernel.org
Cc: Brandon Philips <bphilips@...e.de>
Subject: [PATCH 1/2][RFC] Update net core to use devres.
* netdev_pci_remove_one() can replace simple pci device remove
functions
* devm_alloc_netdev() is like alloc_netdev but allocates memory using devres.
alloc_netdev() can be removed once all drivers use devres.
Applies against 2.6.22
Signed-off-by: Brandon Philips <bphilips@...e.de>
---
include/linux/etherdevice.h | 2 +
include/linux/netdevice.h | 5 ++++
net/core/dev.c | 48 ++++++++++++++++++++++++++++++++++++++++----
net/ethernet/eth.c | 6 +++++
4 files changed, 57 insertions(+), 4 deletions(-)
Index: linux-2.6/include/linux/netdevice.h
===================================================================
--- linux-2.6.orig/include/linux/netdevice.h
+++ linux-2.6/include/linux/netdevice.h
@@ -622,6 +622,7 @@ extern int dev_queue_xmit(struct sk_buf
extern int register_netdevice(struct net_device *dev);
extern void unregister_netdevice(struct net_device *dev);
extern void free_netdev(struct net_device *dev);
+extern void netdev_pci_remove_one(struct pci_dev *pdev);
extern void synchronize_net(void);
extern int register_netdevice_notifier(struct notifier_block *nb);
extern int unregister_netdevice_notifier(struct notifier_block *nb);
@@ -992,6 +993,10 @@ static inline void netif_tx_disable(stru
extern void ether_setup(struct net_device *dev);
/* Support for loadable net-drivers */
+
+extern struct net_device *devm_alloc_netdev(struct device *dev,
+ int sizeof_priv, const char *name,
+ void (*setup)(struct net_device *));
extern struct net_device *alloc_netdev(int sizeof_priv, const char *name,
void (*setup)(struct net_device *));
extern int register_netdev(struct net_device *dev);
Index: linux-2.6/net/core/dev.c
===================================================================
--- linux-2.6.orig/net/core/dev.c
+++ linux-2.6/net/core/dev.c
@@ -89,6 +89,7 @@
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
+#include <linux/pci.h>
#include <linux/etherdevice.h>
#include <linux/notifier.h>
#include <linux/skbuff.h>
@@ -3343,7 +3344,8 @@ static struct net_device_stats *internal
}
/**
- * alloc_netdev - allocate network device
+ * __alloc_netdev - allocate network device
+ * @dev: managed device responsible for mem; NULL if not managed
* @sizeof_priv: size of private data to allocate space for
* @name: device name format string
* @setup: callback to initialize device
@@ -3351,8 +3353,8 @@ static struct net_device_stats *internal
* Allocates a struct net_device with private data area for driver use
* and performs basic initialization.
*/
-struct net_device *alloc_netdev(int sizeof_priv, const char *name,
- void (*setup)(struct net_device *))
+struct net_device *__alloc_netdev(struct device *gendev, int sizeof_priv,
+ const char *name, void (*setup)(struct net_device *))
{
void *p;
struct net_device *dev;
@@ -3364,7 +3366,11 @@ struct net_device *alloc_netdev(int size
alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
- p = kzalloc(alloc_size, GFP_KERNEL);
+ if (dev == NULL)
+ p = kzalloc(alloc_size, GFP_KERNEL);
+ else
+ p = devm_kzalloc(gendev, alloc_size, GFP_KERNEL);
+
if (!p) {
printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
return NULL;
@@ -3382,8 +3388,23 @@ struct net_device *alloc_netdev(int size
strcpy(dev->name, name);
return dev;
}
+
+struct net_device *devm_alloc_netdev(struct device *dev, int sizeof_priv, const
+ char *name, void (*setup)(struct net_device *))
+{
+ return __alloc_netdev(dev, sizeof_priv, name, setup);
+}
+EXPORT_SYMBOL(devm_alloc_netdev);
+
+struct net_device *alloc_netdev(int sizeof_priv, const char *name,
+ void (*setup)(struct net_device *))
+{
+ return __alloc_netdev(NULL, sizeof_priv, name, setup);
+}
EXPORT_SYMBOL(alloc_netdev);
+
+
/**
* free_netdev - free network device
* @dev: device
@@ -3411,6 +3432,25 @@ void free_netdev(struct net_device *dev)
#endif
}
+/**
+ * free_netdev - free network device
+ * @dev: device
+ *
+ * This function does the last stage of destroying an allocated device
+ * interface. The reference to the device object is released.
+ * If this is the last reference then it will be freed.
+ */
+void netdev_pci_remove_one(struct pci_dev *pdev)
+{
+ struct net_device *netdev = pci_get_drvdata(pdev);
+ if (netdev) {
+ unregister_netdev(netdev);
+ pci_set_drvdata(pdev, NULL);
+ }
+}
+EXPORT_SYMBOL(netdev_pci_remove_one);
+
+
/* Synchronize with packet receive processing. */
void synchronize_net(void)
{
Index: linux-2.6/include/linux/etherdevice.h
===================================================================
--- linux-2.6.orig/include/linux/etherdevice.h
+++ linux-2.6/include/linux/etherdevice.h
@@ -40,6 +40,8 @@ extern int eth_header_cache(struct neig
struct hh_cache *hh);
extern struct net_device *alloc_etherdev(int sizeof_priv);
+extern struct net_device *devm_alloc_etherdev(struct device *dev,
+ int sizeof_priv);
static inline void eth_copy_and_sum (struct sk_buff *dest,
const unsigned char *src,
int len, int base)
Index: linux-2.6/net/ethernet/eth.c
===================================================================
--- linux-2.6.orig/net/ethernet/eth.c
+++ linux-2.6/net/ethernet/eth.c
@@ -333,3 +333,9 @@ struct net_device *alloc_etherdev(int si
return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
}
EXPORT_SYMBOL(alloc_etherdev);
+
+struct net_device *devm_alloc_etherdev(struct device *dev, int sizeof_priv)
+{
+ return devm_alloc_netdev(dev, sizeof_priv, "eth%d", ether_setup);
+}
+EXPORT_SYMBOL(devm_alloc_etherdev);
-
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