FIXM: rust: spi: Add spi_message_init

Signed-off-by: Esteban Blanc <estblcsk@gmail.com>

Author: Skallwar

rust/helpers.c

@@ -31,6 +31,7 @@
 #include <linux/spinlock.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
+#include <linux/spi/spi.h>
 
 __noreturn void rust_helper_BUG(void)
 {
@@ -157,6 +158,13 @@ void rust_helper_init_work_with_key(struct work_struct *work, work_func_t func,
 }
 EXPORT_SYMBOL_GPL(rust_helper_init_work_with_key);
 
+void rust_helper_spi_message_init(struct spi_message *m)
+{
+	memset(m, 0, sizeof *m);
+	spi_message_init_no_memset(m);
+}
+EXPORT_SYMBOL_GPL(rust_helper_spi_message_init);
+
 /*
  * `bindgen` binds the C `size_t` type as the Rust `usize` type, so we can
  * use it in contexts where Rust expects a `usize` like slice (array) indices.

rust/kernel/spi.rs

@@ -295,6 +295,7 @@ impl SpiMessage {
     }
     /// Equivalent of `spi_message_init`
     pub fn spi_message_init(&mut self) {
+        unsafe { bindings::rust_helper_spi_message_init(self.0) }
     }
 }