linux-kernel - [PATCH v2 1/4] soundwire: stream: use consistent pattern for freeing buffers

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Message-Id: <20230119073211.85979-2-yung-chuan.liao@linux.intel.com>
Date:   Thu, 19 Jan 2023 15:32:08 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, bard.liao@...el.com
Subject: [PATCH v2 1/4] soundwire: stream: use consistent pattern for freeing buffers

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

The code should free the message buffer used for data, the message
structure used for control and assign the latter to NULL. The last
part is missing for multi-link cases, and the order is inconsistent
for single-link cases.

Link: https://github.com/thesofproject/linux/issues/4056
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
---
 drivers/soundwire/stream.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index df3b36670df4..9c13dbd2b26e 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -723,8 +723,8 @@ static int sdw_bank_switch(struct sdw_bus *bus, int m_rt_count)
 	}
 
 	if (!multi_link) {
-		kfree(wr_msg);
 		kfree(wbuf);
+		kfree(wr_msg);
 		bus->defer_msg.msg = NULL;
 		bus->params.curr_bank = !bus->params.curr_bank;
 		bus->params.next_bank = !bus->params.next_bank;
@@ -769,6 +769,7 @@ static int sdw_ml_sync_bank_switch(struct sdw_bus *bus)
 	if (bus->defer_msg.msg) {
 		kfree(bus->defer_msg.msg->buf);
 		kfree(bus->defer_msg.msg);
+		bus->defer_msg.msg = NULL;
 	}
 
 	return 0;
@@ -867,6 +868,7 @@ static int do_bank_switch(struct sdw_stream_runtime *stream)
 		if (bus->defer_msg.msg) {
 			kfree(bus->defer_msg.msg->buf);
 			kfree(bus->defer_msg.msg);
+			bus->defer_msg.msg = NULL;
 		}
 	}
 
-- 
2.25.1