Merge branch 'master' into for-3.12/upstream

[~andy/linux] / drivers / hid / hidraw.c

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 6f1feb2c2e97b5defb0628d92bfc98a719449685..8918dd12bb6915d08ab588e04b22b64a24d6e827 100644 (file)
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -113,7 +113,7 @@ static ssize_t hidraw_send_report(struct file *file, const char __user *buffer,
        __u8 *buf;
        int ret = 0;
 
-       if (!hidraw_table[minor]) {
+       if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
                ret = -ENODEV;
                goto out;
        }
@@ -253,6 +253,7 @@ static int hidraw_open(struct inode *inode, struct file *file)
        unsigned int minor = iminor(inode);
        struct hidraw *dev;
        struct hidraw_list *list;
+       unsigned long flags;
        int err = 0;
 
        if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) {
@@ -261,16 +262,11 @@ static int hidraw_open(struct inode *inode, struct file *file)
        }
 
        mutex_lock(&minors_lock);
-       if (!hidraw_table[minor]) {
+       if (!hidraw_table[minor] || !hidraw_table[minor]->exist) {
                err = -ENODEV;
                goto out_unlock;
        }
 
-       list->hidraw = hidraw_table[minor];
-       mutex_init(&list->read_mutex);
-       list_add_tail(&list->node, &hidraw_table[minor]->list);
-       file->private_data = list;
-
        dev = hidraw_table[minor];
        if (!dev->open++) {
                err = hid_hw_power(dev->hid, PM_HINT_FULLON);
@@ -283,9 +279,16 @@ static int hidraw_open(struct inode *inode, struct file *file)
                if (err < 0) {
                        hid_hw_power(dev->hid, PM_HINT_NORMAL);
                        dev->open--;
+                       goto out_unlock;
                }
        }
 
+       list->hidraw = hidraw_table[minor];
+       mutex_init(&list->read_mutex);
+       spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
+       list_add_tail(&list->node, &hidraw_table[minor]->list);
+       spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
+       file->private_data = list;
 out_unlock:
        mutex_unlock(&minors_lock);
 out:
@@ -302,39 +305,41 @@ static int hidraw_fasync(int fd, struct file *file, int on)
        return fasync_helper(fd, file, on, &list->fasync);
 }
 
+static void drop_ref(struct hidraw *hidraw, int exists_bit)
+{
+       if (exists_bit) {
+               hid_hw_close(hidraw->hid);
+               hidraw->exist = 0;
+               if (hidraw->open)
+                       wake_up_interruptible(&hidraw->wait);
+       } else {
+               --hidraw->open;
+       }
+
+       if (!hidraw->open && !hidraw->exist) {
+               device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
+               hidraw_table[hidraw->minor] = NULL;
+               kfree(hidraw);
+       }
+}
+
 static int hidraw_release(struct inode * inode, struct file * file)
 {
        unsigned int minor = iminor(inode);
-       struct hidraw *dev;
        struct hidraw_list *list = file->private_data;
-       int ret;
-       int i;
+       unsigned long flags;
 
        mutex_lock(&minors_lock);
-       if (!hidraw_table[minor]) {
-               ret = -ENODEV;
-               goto unlock;
-       }
 
+       spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags);
        list_del(&list->node);
-       dev = hidraw_table[minor];
-       if (!--dev->open) {
-               if (list->hidraw->exist) {
-                       hid_hw_power(dev->hid, PM_HINT_NORMAL);
-                       hid_hw_close(dev->hid);
-               } else {
-                       kfree(list->hidraw);
-               }
-       }
-
-       for (i = 0; i < HIDRAW_BUFFER_SIZE; ++i)
-               kfree(list->buffer[i].value);
+       spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags);
        kfree(list);
-       ret = 0;
-unlock:
-       mutex_unlock(&minors_lock);
 
-       return ret;
+       drop_ref(hidraw_table[minor], 0);
+
+       mutex_unlock(&minors_lock);
+       return 0;
 }
 
 static long hidraw_ioctl(struct file *file, unsigned int cmd,
@@ -457,7 +462,9 @@ int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
        struct hidraw *dev = hid->hidraw;
        struct hidraw_list *list;
        int ret = 0;
+       unsigned long flags;
 
+       spin_lock_irqsave(&dev->list_lock, flags);
        list_for_each_entry(list, &dev->list, node) {
                int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1);
 
@@ -472,6 +479,7 @@ int hidraw_report_event(struct hid_device *hid, u8 *data, int len)
                list->head = new_head;
                kill_fasync(&list->fasync, SIGIO, POLL_IN);
        }
+       spin_unlock_irqrestore(&dev->list_lock, flags);
 
        wake_up_interruptible(&dev->wait);
        return ret;
@@ -519,6 +527,7 @@ int hidraw_connect(struct hid_device *hid)
        }
 
        init_waitqueue_head(&dev->wait);
+       spin_lock_init(&dev->list_lock);
        INIT_LIST_HEAD(&dev->list);
 
        dev->hid = hid;
@@ -539,18 +548,9 @@ void hidraw_disconnect(struct hid_device *hid)
        struct hidraw *hidraw = hid->hidraw;
 
        mutex_lock(&minors_lock);
-       hidraw->exist = 0;
 
-       device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor));
+       drop_ref(hidraw, 1);
 
-       hidraw_table[hidraw->minor] = NULL;
-
-       if (hidraw->open) {
-               hid_hw_close(hid);
-               wake_up_interruptible(&hidraw->wait);
-       } else {
-               kfree(hidraw);
-       }
        mutex_unlock(&minors_lock);
 }
 EXPORT_SYMBOL_GPL(hidraw_disconnect);