# \[PATCH v4 36/47\] soc: fsl: qe: make cpm\_muram\_free() ignore a negative offset

- From: Rasmus Villemoes \<linux@rasmusvillemoes.dk\>
- Date: 2019-11-08 13:02:23 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/11/5769893
- Thread: https://ratatoskr.run/linuxppc-dev/2019/11/5769927/t.md

```text
This allows one to simplify callers since they can store a negative
value as a sentinel to indicate "this was never allocated" (or store
the -ENOMEM from an allocation failure) and then call cpm_muram_free()
unconditionally.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
 drivers/soc/fsl/qe/qe_common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/soc/fsl/qe/qe_common.c b/drivers/soc/fsl/qe/qe_common.c
index ea9bef1d2c77..4437f4e14d2c 100644
--- a/drivers/soc/fsl/qe/qe_common.c
+++ b/drivers/soc/fsl/qe/qe_common.c
@@ -176,6 +176,9 @@ void cpm_muram_free(s32 offset)
 	int size;
 	struct muram_block *tmp;
 
+	if (offset < 0)
+		return;
+
 	size = 0;
 	spin_lock_irqsave(&cpm_muram_lock, flags);
 	list_for_each_entry(tmp, &muram_block_list, head) {
-- 
2.23.0

```