uio: convert to idr_alloc()

Convert to the much saner new idr interface.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Hans J. Koch" <hjk@hansjkoch.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 5110f36..c8b9262 100644 (file)
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -369,26 +369,15 @@ static void uio_dev_del_attributes(struct uio_device *idev)
 static int uio_get_minor(struct uio_device *idev)
 {
        int retval = -ENOMEM;
-       int id;
 
        mutex_lock(&minor_lock);
-       if (idr_pre_get(&uio_idr, GFP_KERNEL) == 0)
-               goto exit;
-
-       retval = idr_get_new(&uio_idr, idev, &id);
-       if (retval < 0) {
-               if (retval == -EAGAIN)
-                       retval = -ENOMEM;
-               goto exit;
-       }
-       if (id < UIO_MAX_DEVICES) {
-               idev->minor = id;
-       } else {
+       retval = idr_alloc(&uio_idr, idev, 0, UIO_MAX_DEVICES, GFP_KERNEL);
+       if (retval >= 0) {
+               idev->minor = retval;
+       } else if (retval == -ENOSPC) {
                dev_err(idev->dev, "too many uio devices\n");
                retval = -EINVAL;
-               idr_remove(&uio_idr, id);
        }
-exit:
        mutex_unlock(&minor_lock);
        return retval;
 }