From 3c1923a119a61534f8ce221766041ddf470c9307 Mon Sep 17 00:00:00 2001
From: Cezary Rojewski <cezary.rojewski@intel.com>
Date: Thu, 7 Jul 2022 14:41:45 +0200
Subject: [PATCH] ASoC: Intel: avs: Copy only as many RX bytes as necessary
Git-commit: 3c1923a119a61534f8ce221766041ddf470c9307
Patch-mainline: v6.0-rc1
References: jsc#PED-850

There is no need to copy number of bytes specified by IPC message caller
if DSP firmware returned lower number. In consequence, LARGE_CONFIG_GET
handler is simplified.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220707124153.1858249-5-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/intel/avs/ipc.c      | 1 +
 sound/soc/intel/avs/messages.c | 6 ++----
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/sound/soc/intel/avs/ipc.c b/sound/soc/intel/avs/ipc.c
index d755ba8b8518..020d85c7520d 100644
--- a/sound/soc/intel/avs/ipc.c
+++ b/sound/soc/intel/avs/ipc.c
@@ -480,6 +480,7 @@ static int avs_dsp_do_send_msg(struct avs_dev *adev, struct avs_ipc_msg *request
 	ret = ipc->rx.rsp.status;
 	if (reply) {
 		reply->header = ipc->rx.header;
+		reply->size = ipc->rx.size;
 		if (reply->data && ipc->rx.size)
 			memcpy(reply->data, ipc->rx.data, reply->size);
 	}
diff --git a/sound/soc/intel/avs/messages.c b/sound/soc/intel/avs/messages.c
index 6404fce8cde4..3559fb496e0b 100644
--- a/sound/soc/intel/avs/messages.c
+++ b/sound/soc/intel/avs/messages.c
@@ -378,7 +378,6 @@ int avs_ipc_get_large_config(struct avs_dev *adev, u16 module_id, u8 instance_id
 	union avs_module_msg msg = AVS_MODULE_REQUEST(LARGE_CONFIG_GET);
 	struct avs_ipc_msg request;
 	struct avs_ipc_msg reply = {{0}};
-	size_t size;
 	void *buf;
 	int ret;
 
@@ -406,15 +405,14 @@ int avs_ipc_get_large_config(struct avs_dev *adev, u16 module_id, u8 instance_id
 		return ret;
 	}
 
-	size = reply.rsp.ext.large_config.data_off_size;
-	buf = krealloc(reply.data, size, GFP_KERNEL);
+	buf = krealloc(reply.data, reply.size, GFP_KERNEL);
 	if (!buf) {
 		kfree(reply.data);
 		return -ENOMEM;
 	}
 
 	*reply_data = buf;
-	*reply_size = size;
+	*reply_size = reply.size;
 
 	return 0;
 }
-- 
2.35.3