IB/rxe: Fix missing umem_odp->umem_mutex unlock on error path

rxe_odp_map_range_and_lock() must release umem_odp->umem_mutex when an
error occurs, including cases where rxe_check_pagefault() fails.

Fixes: 2fae67a ("RDMA/rxe: Add support for Send/Recv/Write/Read with ODP")
Signed-off-by: Li Zhijian <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reviewed-by: Zhu Yanjun <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

Author: zhijianli88

drivers/infiniband/sw/rxe/rxe_odp.c

@@ -179,8 +179,10 @@ static int rxe_odp_map_range_and_lock(struct rxe_mr *mr, u64 iova, int length, u
 			return err;
 
 		need_fault = rxe_check_pagefault(umem_odp, iova, length);
-		if (need_fault)
+		if (need_fault) {
+			mutex_unlock(&umem_odp->umem_mutex);
 			return -EFAULT;
+		}
 	}
 
 	return 0;