From d1805c2f00a1099244b9e3fa06873d068c55607c Mon Sep 17 00:00:00 2001
From: fef <owo@fef.moe>
Date: Tue, 10 Aug 2021 18:07:55 +0200
Subject: [PATCH] dma: make memory allocations atomic

---
 kernel/dma.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/dma.c b/kernel/dma.c
index dee0573..d3d2daf 100644
--- a/kernel/dma.c
+++ b/kernel/dma.c
@@ -18,7 +18,11 @@ static void dmabuf_destroy(struct kent *kent)
 struct dmabuf *dmabuf_create(struct device *dev, size_t len)
 {
 	int err = 0;
-	struct dmabuf *buf = malloc(sizeof(*buf) + len);
+	/*
+	 * allocation needs to be atomic because the buffer might be
+	 * free()d from within an irq handler which cannot sleep
+	 */
+	struct dmabuf *buf = atomic_malloc(sizeof(*buf) + len);
 	if (buf == NULL)
 		return NULL;