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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-11-16 00:36:08 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-16 00:36:08 -0800
commitcda2836dc66f814aecc58370251566e1c225c8d3 (patch)
treeebb381e9ed2a3a93621690b886b4e241a5fa4c81
parent74ad0a5421edc6ef13a4059c6076cd7a4f3a1fd5 (diff)
pegasus: minor resource shrinkage
Make pegasus driver not allocate a workqueue until the driver is bound to some device, which will need that workqueue if the device is brought up. This conserves resources when the driver is linked but there's no pegasus device connected. Also shrink the runtime footprint a smidgeon by moving some init-only code into its proper section, and move an obnoxious (frequent and meaningless) message to be debug-only. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/usb/pegasus.c36
1 files changed, 26 insertions, 10 deletions
diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index c073929c4d7..075e8e94225 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -1213,7 +1213,7 @@ static void pegasus_set_multicast(struct net_device *net)
pegasus->eth_regs[EthCtrl0] |= RX_MULTICAST;
pegasus->eth_regs[EthCtrl2] &= ~RX_PROMISCUOUS;
if (netif_msg_link(pegasus))
- pr_info("%s: set allmulti\n", net->name);
+ pr_debug("%s: set allmulti\n", net->name);
} else {
pegasus->eth_regs[EthCtrl0] &= ~RX_MULTICAST;
pegasus->eth_regs[EthCtrl2] &= ~RX_PROMISCUOUS;
@@ -1273,6 +1273,7 @@ static inline void setup_pegasus_II(pegasus_t * pegasus)
}
+static int pegasus_count;
static struct workqueue_struct *pegasus_workqueue = NULL;
#define CARRIER_CHECK_DELAY (2 * HZ)
@@ -1301,6 +1302,18 @@ static int pegasus_blacklisted(struct usb_device *udev)
return 0;
}
+/* we rely on probe() and remove() being serialized so we
+ * don't need extra locking on pegasus_count.
+ */
+static void pegasus_dec_workqueue(void)
+{
+ pegasus_count--;
+ if (pegasus_count == 0) {
+ destroy_workqueue(pegasus_workqueue);
+ pegasus_workqueue = NULL;
+ }
+}
+
static int pegasus_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
@@ -1310,12 +1323,17 @@ static int pegasus_probe(struct usb_interface *intf,
int dev_index = id - pegasus_ids;
int res = -ENOMEM;
- usb_get_dev(dev);
+ if (pegasus_blacklisted(dev))
+ return -ENODEV;
- if (pegasus_blacklisted(dev)) {
- res = -ENODEV;
- goto out;
+ if (pegasus_count == 0) {
+ pegasus_workqueue = create_singlethread_workqueue("pegasus");
+ if (!pegasus_workqueue)
+ return -ENOMEM;
}
+ pegasus_count++;
+
+ usb_get_dev(dev);
net = alloc_etherdev(sizeof(struct pegasus));
if (!net) {
@@ -1400,6 +1418,7 @@ out1:
free_netdev(net);
out:
usb_put_dev(dev);
+ pegasus_dec_workqueue();
return res;
}
@@ -1425,6 +1444,7 @@ static void pegasus_disconnect(struct usb_interface *intf)
pegasus->rx_skb = NULL;
}
free_netdev(pegasus->net);
+ pegasus_dec_workqueue();
}
static int pegasus_suspend (struct usb_interface *intf, pm_message_t message)
@@ -1468,7 +1488,7 @@ static struct usb_driver pegasus_driver = {
.resume = pegasus_resume,
};
-static void parse_id(char *id)
+static void __init parse_id(char *id)
{
unsigned int vendor_id=0, device_id=0, flags=0, i=0;
char *token, *name=NULL;
@@ -1504,15 +1524,11 @@ static int __init pegasus_init(void)
pr_info("%s: %s, " DRIVER_DESC "\n", driver_name, DRIVER_VERSION);
if (devid)
parse_id(devid);
- pegasus_workqueue = create_singlethread_workqueue("pegasus");
- if (!pegasus_workqueue)
- return -ENOMEM;
return usb_register(&pegasus_driver);
}
static void __exit pegasus_exit(void)
{
- destroy_workqueue(pegasus_workqueue);
usb_deregister(&pegasus_driver);
}