Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 134 insertions, 0 deletions

diff --git a/drivers/net/irda/sir_dongle.c b/drivers/net/irda/sir_dongle.c
new file mode 100644
index 000000000000..c5b76746e72b
--- /dev/null
+++ b/drivers/net/irda/sir_dongle.c
@@ -0,0 +1,134 @@
+/*********************************************************************
+ *
+ *      sir_dongle.c:   manager for serial dongle protocol drivers
+ *
+ *      Copyright (c) 2002 Martin Diehl
+ *
+ *      This program is free software; you can redistribute it and/or 
+ *      modify it under the terms of the GNU General Public License as 
+ *      published by the Free Software Foundation; either version 2 of 
+ *      the License, or (at your option) any later version.
+ *
+ ********************************************************************/    
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smp_lock.h>
+#include <linux/kmod.h>
+
+#include <net/irda/irda.h>
+
+#include "sir-dev.h"
+
+/**************************************************************************
+ *
+ * dongle registration and attachment
+ *
+ */
+
+static LIST_HEAD(dongle_list);                  /* list of registered dongle drivers */
+static DECLARE_MUTEX(dongle_list_lock);         /* protects the list */
+
+int irda_register_dongle(struct dongle_driver *new)
+{
+        struct list_head *entry;
+        struct dongle_driver *drv;
+
+        IRDA_DEBUG(0, "%s : registering dongle \"%s\" (%d).\n",
+                   __FUNCTION__, new->driver_name, new->type);
+
+        down(&dongle_list_lock);
+        list_for_each(entry, &dongle_list) {
+                drv = list_entry(entry, struct dongle_driver, dongle_list);
+                if (new->type == drv->type) {
+                        up(&dongle_list_lock);
+                        return -EEXIST;
+                }
+        }
+        list_add(&new->dongle_list, &dongle_list);
+        up(&dongle_list_lock);
+        return 0;
+}
+
+int irda_unregister_dongle(struct dongle_driver *drv)
+{
+        down(&dongle_list_lock);
+        list_del(&drv->dongle_list);
+        up(&dongle_list_lock);
+        return 0;
+}
+
+int sirdev_get_dongle(struct sir_dev *dev, IRDA_DONGLE type)
+{
+        struct list_head *entry;
+        const struct dongle_driver *drv = NULL;
+        int err = -EINVAL;
+
+#ifdef CONFIG_KMOD
+        request_module("irda-dongle-%d", type);
+#endif
+
+        if (dev->dongle_drv != NULL)
+                return -EBUSY;
+        
+        /* serialize access to the list of registered dongles */
+        down(&dongle_list_lock);
+
+        list_for_each(entry, &dongle_list) {
+                drv = list_entry(entry, struct dongle_driver, dongle_list);
+                if (drv->type == type)
+                        break;
+                else
+                        drv = NULL;
+        }
+
+        if (!drv) {
+                err = -ENODEV;
+                goto out_unlock;        /* no such dongle */
+        }
+
+        /* handling of SMP races with dongle module removal - three cases:
+         * 1) dongle driver was already unregistered - then we haven't found the
+         *      requested dongle above and are already out here
+         * 2) the module is already marked deleted but the driver is still
+         *      registered - then the try_module_get() below will fail
+         * 3) the try_module_get() below succeeds before the module is marked
+         *      deleted - then sys_delete_module() fails and prevents the removal
+         *      because the module is in use.
+         */
+
+        if (!try_module_get(drv->owner)) {
+                err = -ESTALE;
+                goto out_unlock;        /* rmmod already pending */
+        }
+        dev->dongle_drv = drv;
+
+        if (!drv->open  ||  (err=drv->open(dev))!=0)
+                goto out_reject;                /* failed to open driver */
+
+        up(&dongle_list_lock);
+        return 0;
+
+out_reject:
+        dev->dongle_drv = NULL;
+        module_put(drv->owner);
+out_unlock:
+        up(&dongle_list_lock);
+        return err;
+}
+
+int sirdev_put_dongle(struct sir_dev *dev)
+{
+        const struct dongle_driver *drv = dev->dongle_drv;
+
+        if (drv) {
+                if (drv->close)
+                        drv->close(dev);                /* close this dongle instance */
+
+                dev->dongle_drv = NULL;                 /* unlink the dongle driver */
+                module_put(drv->owner);/* decrement driver's module refcount */
+        }
+
+        return 0;
+}