staging: nvec: add ability to ignore EC responses in sync writes

In case we just want to submit a message to the EC but are not
interested in its response, we can free the response buffer early.

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Link: https://lore.kernel.org/r/20240406123123.37148-2-marvin24@gmx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
index b4485b10beb8b37061b3c0bd810c60d4d4a64ba1..e5ca78e573841b73a479a4cd6a28efc27841e074 100644 (file)
--- a/drivers/staging/nvec/nvec.c
+++ b/drivers/staging/nvec/nvec.c
@@ -300,7 +300,9 @@ int nvec_write_sync(struct nvec_chip *nvec,
 {
        mutex_lock(&nvec->sync_write_mutex);
 
-       *msg = NULL;
+       if (msg != NULL)
+               *msg = NULL;
+
        nvec->sync_write_pending = (data[1] << 8) + data[0];
 
        if (nvec_write_async(nvec, data, size) < 0) {
@@ -320,7 +322,10 @@ int nvec_write_sync(struct nvec_chip *nvec,
 
        dev_dbg(nvec->dev, "nvec_sync_write: pong!\n");
 
-       *msg = nvec->last_sync_msg;
+       if (msg != NULL)
+               *msg = nvec->last_sync_msg;
+       else
+               nvec_msg_free(nvec, nvec->last_sync_msg);
 
        mutex_unlock(&nvec->sync_write_mutex);