This is a note to let you know that I've just added the patch titled
drm/bridge: ite-it66121: use eld_mutex to protect access to connector->eld
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-bridge-ite-it66121-use-eld_mutex-to-protect-acce.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit eb6767598fcf7479d9b9fccb4edb3555c942ed48
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Fri Dec 6 11:43:06 2024 +0200
drm/bridge: ite-it66121: use eld_mutex to protect access to connector->eld
[ Upstream commit 39ead6e02ea7d19b421e9d42299d4293fed3064e ]
Reading access to connector->eld can happen at the same time the
drm_edid_to_eld() updates the data. Take the newly added eld_mutex in
order to protect connector->eld from concurrent access.
Reviewed-by: Maxime Ripard <mripard@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20241206-drm-connector-eld-mutex-v2-3-c9bce1ee8bea@xxxxxxxxxx
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 8f5846b76d594..2381cd1cba879 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -1452,8 +1452,10 @@ static int it66121_audio_get_eld(struct device *dev, void *data,
dev_dbg(dev, "No connector present, passing empty EDID data");
memset(buf, 0, len);
} else {
+ mutex_lock(&ctx->connector->eld_mutex);
memcpy(buf, ctx->connector->eld,
min(sizeof(ctx->connector->eld), len));
+ mutex_unlock(&ctx->connector->eld_mutex);
}
mutex_unlock(&ctx->lock);
