From ed9fad8c7e71d7a868683957bbfdf64c0eca7ffe Mon Sep 17 00:00:00 2001
From: Til Blechschmidt <til@blechschmidt.de>
Date: Wed, 23 Feb 2022 22:51:01 +0100
Subject: [PATCH] Skip EasyDMA slice location check if slice is empty

---
 embassy-nrf/src/lib.rs  | 2 +-
 embassy-nrf/src/util.rs | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/embassy-nrf/src/lib.rs b/embassy-nrf/src/lib.rs
index b448f6ab..a9df231e 100644
--- a/embassy-nrf/src/lib.rs
+++ b/embassy-nrf/src/lib.rs
@@ -1,7 +1,7 @@
 #![no_std]
 #![cfg_attr(
     feature = "nightly",
-    feature(generic_associated_types, type_alias_impl_trait)
+    feature(generic_associated_types, type_alias_impl_trait, slice_ptr_len)
 )]
 
 #[cfg(not(any(
diff --git a/embassy-nrf/src/util.rs b/embassy-nrf/src/util.rs
index b24bc452..84848e87 100644
--- a/embassy-nrf/src/util.rs
+++ b/embassy-nrf/src/util.rs
@@ -19,10 +19,10 @@ pub(crate) fn slice_in_ram<T>(slice: *const [T]) -> bool {
     ptr >= SRAM_LOWER && (ptr + len * core::mem::size_of::<T>()) < SRAM_UPPER
 }
 
-/// Return an error if slice is not in RAM.
+/// Return an error if slice is not in RAM. Skips check if slice is zero-length.
 #[cfg(not(feature = "nrf51"))]
 pub(crate) fn slice_in_ram_or<T, E>(slice: *const [T], err: E) -> Result<(), E> {
-    if slice_in_ram(slice) {
+    if slice.len() > 0 && slice_in_ram(slice) {
         Ok(())
     } else {
         Err(err)