[dahdi-commits] kpfleming: branch linux/kpfleming/modular_ec r4403 - /linux/team/kpfleming/mo...

[SVN commits to the DAHDI project]

Author: kpfleming
Date: Wed Jun 18 20:48:08 2008
New Revision: 4403

URL: http://svn.digium.com/view/dahdi?view=rev&rev=4403
Log:
add functions for searching for an echocan by name (autoloading if necessary) and releasing a reference to an echocan

Modified:
    linux/team/kpfleming/modular_ec/drivers/dahdi/dahdi-base.c

Modified: linux/team/kpfleming/modular_ec/drivers/dahdi/dahdi-base.c
URL: http://svn.digium.com/view/dahdi/linux/team/kpfleming/modular_ec/drivers/dahdi/dahdi-base.c?view=diff&rev=4403&r1=4402&r2=4403
==============================================================================
--- linux/team/kpfleming/modular_ec/drivers/dahdi/dahdi-base.c (original)
+++ linux/team/kpfleming/modular_ec/drivers/dahdi/dahdi-base.c Wed Jun 18 20:48:08 2008
@@ -3474,6 +3474,61 @@
 #ifdef CONFIG_DAHDI_DEBUG
 	printk("Done Recalculating slaves on %s (last is %s)\n", chan->name, last->name);
 #endif
+}
+
+static const struct dahdi_echocan *find_echocan(const char *name)
+{
+	struct echocan *cur;
+	char name_upper[strlen(name) + 1];
+	char *c;
+	const char *d;
+	char modname_buf[128] = "dahdi_echocan_";
+	unsigned int tried_once = 0;
+
+	for (c = name_upper, d = name; *d; c++, d++) {
+		*c = toupper(*d);
+	}
+
+	*c = '\0';
+
+retry:
+	read_lock(&echocan_list_lock);
+
+	list_for_each_entry(cur, &echocan_list, list) {
+		if (!strcmp(name_upper, cur->ec->name)) {
+			if (try_module_get(cur->owner)) {
+				read_unlock(&echocan_list_lock);
+				return cur->ec;
+			} else {
+				read_unlock(&echocan_list_lock);
+				return NULL;
+			}
+		}
+	}
+
+	read_unlock(&echocan_list_lock);
+
+	if (tried_once) {
+		return NULL;
+	}
+
+	/* couldn't find it, let's try to load it */
+
+	for (c = &modname_buf[strlen(modname_buf)], d = name; *d; c++, d++) {
+		*c = tolower(*d);
+	}
+
+	request_module(modname_buf);
+
+	tried_once = 1;
+
+	/* and try one more time */
+	goto retry;
+}
+
+static void release_echocan(const struct dahdi_echocan *ec)
+{
+	module_put(ec->owner);
 }
 
 static int dahdi_ctl_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long data)