diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index ca4f315..7434d3f 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -1872,9 +1872,9 @@
 	/*
 	 * Read in the last block of the device, make sure it exists.
 	 */
-	bp = xfs_buf_read_uncached(mp, mp->m_rtdev_targp,
+	bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
 				XFS_FSB_TO_BB(mp, nrblocks - 1),
-				XFS_FSB_TO_B(mp, 1), 0);
+				XFS_FSB_TO_BB(mp, 1), 0);
 	if (!bp)
 		return EIO;
 	xfs_buf_relse(bp);
@@ -2219,9 +2219,9 @@
 			(unsigned long long) mp->m_sb.sb_rblocks);
 		return XFS_ERROR(EFBIG);
 	}
-	bp = xfs_buf_read_uncached(mp, mp->m_rtdev_targp,
+	bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
 					d - XFS_FSB_TO_BB(mp, 1),
-					XFS_FSB_TO_B(mp, 1), 0);
+					XFS_FSB_TO_BB(mp, 1), 0);
 	if (!bp) {
 		xfs_warn(mp, "realtime device size check failed");
 		return EIO;