diff --git a/rust/pv/src/utils.rs b/rust/pv/src/utils.rs
index 33bcd4d0..13dda2aa 100644
--- a/rust/pv/src/utils.rs
+++ b/rust/pv/src/utils.rs
@@ -527,15 +527,15 @@ mod tests {
     fn parse_hex() {
         let s = "123456acbef0";
         let exp = vec![0x12, 0x34, 0x56, 0xac, 0xbe, 0xf0];
-        assert_eq!(super::parse_hex(&s), exp);
+        assert_eq!(super::parse_hex(s), exp);
 
         let s = "00123456acbef0";
         let exp = vec![0, 0x12, 0x34, 0x56, 0xac, 0xbe, 0xf0];
-        assert_eq!(super::parse_hex(&s), exp);
+        assert_eq!(super::parse_hex(s), exp);
 
         let s = "00123456acbef0ii90";
         let exp = vec![0, 0x12, 0x34, 0x56, 0xac, 0xbe, 0xf0];
-        assert_eq!(super::parse_hex(&s), exp);
+        assert_eq!(super::parse_hex(s), exp);
     }
 
     #[test]
@@ -653,6 +653,6 @@ mod tests {
         assert!(super::memeq(&a, &a.clone()));
         assert!(!super::memeq(&b, &a));
         assert!(!super::memeq(&b, &c));
-        assert!(!super::memeq(&b, &vec![]));
+        assert!(!super::memeq(&b, &[]));
     }
 }
diff --git a/rust/pv/src/uvdevice/test.rs b/rust/pv/src/uvdevice/test.rs
index c34c2946..0d67a3d8 100644
--- a/rust/pv/src/uvdevice/test.rs
+++ b/rust/pv/src/uvdevice/test.rs
@@ -61,7 +61,6 @@ impl IoctlCtx {
 
 pub mod mock_libc {
     use super::*;
-    use std::mem::transmute;
 
     pub unsafe fn ioctl(
         fd: ::libc::c_int,
@@ -75,7 +74,7 @@ pub mod mock_libc {
         assert_eq!(cmd, ctx.exp_cmd, "IOCTL cmd mismatch");
         assert_eq!(fd, 17, "IOCTL fd mismatch");
 
-        let data_ref: &mut ffi::uvio_ioctl_cb = transmute(data);
+        let data_ref: &mut ffi::uvio_ioctl_cb = &mut *data;
 
         (ctx.modify)(data_ref)
     }
@@ -194,11 +193,7 @@ fn ioctl_write_data() {
     get_lock(&IOCTL_MTX).exp_cmd(TEST_CMD).set_mdfy(move |cb| {
         cb.set_rc(1).addr_eq(data_addr).size_eq(32);
         unsafe {
-            ::libc::memset(
-                (*cb).argument_addr as *mut ::libc::c_void,
-                0x42,
-                cmd_data_len,
-            );
+            ::libc::memset(cb.argument_addr as *mut ::libc::c_void, 0x42, cmd_data_len);
         }
         0
     });
@@ -223,7 +218,7 @@ fn ioctl_read_data() {
     get_lock(&IOCTL_MTX).exp_cmd(TEST_CMD).set_mdfy(move |cb| {
         cb.set_rc(1).addr_eq(data_addr).size_eq(32);
         unsafe {
-            let data = std::slice::from_raw_parts((*cb).argument_addr as *const u8, cmd_data_len);
+            let data = std::slice::from_raw_parts(cb.argument_addr as *const u8, cmd_data_len);
             assert_eq!(data, data_exp);
         }
         0