HID: Push down BKL into ioctl handler in hidraw

In this case I simply wrapped it as code review suggests the locking
already terminally broken and I didn't want to make it first. See added
comment

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 0c6b4d4e7e2700ee9135d2729b8c388f7d8c6118..1018f380de357557688f75a288198dd330dcd0e2 100644 (file)
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -105,6 +105,7 @@ out:
 static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
 {
        unsigned int minor = iminor(file->f_path.dentry->d_inode);
+       /* FIXME: What stops hidraw_table going NULL */
        struct hid_device *dev = hidraw_table[minor]->hid;
        __u8 *buf;
        int ret = 0;
@@ -214,35 +215,38 @@ static int hidraw_release(struct inode * inode, struct file * file)
        return 0;
 }
 
-static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long hidraw_ioctl(struct file *file, unsigned int cmd,
+                                                       unsigned long arg)
 {
+       struct inode *inode = file->f_path.dentry->d_inode;
        unsigned int minor = iminor(inode);
+       long ret = 0;
+       /* FIXME: What stops hidraw_table going NULL */
        struct hidraw *dev = hidraw_table[minor];
        void __user *user_arg = (void __user*) arg;
 
+       lock_kernel();
        switch (cmd) {
                case HIDIOCGRDESCSIZE:
                        if (put_user(dev->hid->rsize, (int __user *)arg))
-                               return -EFAULT;
-                       return 0;
+                               ret = -EFAULT;
+                       break;
 
                case HIDIOCGRDESC:
                        {
                                __u32 len;
 
                                if (get_user(len, (int __user *)arg))
-                                       return -EFAULT;
-
-                               if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
-                                       return -EINVAL;
-
-                               if (copy_to_user(user_arg + offsetof(
-                                                               struct hidraw_report_descriptor,
-                                                               value[0]),
-                                                       dev->hid->rdesc,
-                                                       min(dev->hid->rsize, len)))
-                                               return -EFAULT;
-                               return 0;
+                                       ret = -EFAULT;
+                               else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
+                                       ret = -EINVAL;
+                               else if (copy_to_user(user_arg + offsetof(
+                                       struct hidraw_report_descriptor,
+                                       value[0]),
+                                       dev->hid->rdesc,
+                                       min(dev->hid->rsize, len)))
+                                       ret = -EFAULT;
+                               break;
                        }
                case HIDIOCGRAWINFO:
                        {
@@ -252,15 +256,13 @@ static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd
                                dinfo.vendor = dev->hid->vendor;
                                dinfo.product = dev->hid->product;
                                if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
-                                       return -EFAULT;
-
-                               return 0;
+                                       ret = -EFAULT;
+                               break;
                        }
                default:
-                       printk(KERN_EMERG "hidraw: unsupported ioctl() %x\n",
-                                       cmd);
+                       ret = -ENOTTY;
        }
-       return -EINVAL;
+       return ret;
 }
 
 static const struct file_operations hidraw_ops = {
@@ -270,7 +272,7 @@ static const struct file_operations hidraw_ops = {
        .poll =         hidraw_poll,
        .open =         hidraw_open,
        .release =      hidraw_release,
-       .ioctl =        hidraw_ioctl,
+       .unlocked_ioctl = hidraw_ioctl,
 };
 
 void hidraw_report_event(struct hid_device *hid, u8 *data, int len)