gpio: convert to idr_alloc()

Convert to the much saner new idr interface.

Signed-off-by: Tejun Heo <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Cc: Grant Likely <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/gpio/gpiolib.c

···
 			goto err_out;
 		}
 
-		do {
-			ret = -ENOMEM;
-			if (idr_pre_get(&dirent_idr, GFP_KERNEL))
-				ret = idr_get_new_above(&dirent_idr, value_sd,
-							1, &id);
-		} while (ret == -EAGAIN);
-
-		if (ret)
+		ret = idr_alloc(&dirent_idr, value_sd, 1, 0, GFP_KERNEL);
+		if (ret < 0)
 			goto free_sd;
+		id = ret;
 
 		desc->flags &= GPIO_FLAGS_MASK;
 		desc->flags |= (unsigned long)id << ID_SHIFT;