[PATCH 5.4 035/320] drm/panel: innolux-p079zca: Delete panel on attach() failure

Greg Kroah-Hartman
2022-01-24T19:28:12Z

From: Brian Norris <briannorris@chromium.org>

[ Upstream commit 32a267e9c057e1636e7afdd20599aa5741a73079 ]

If we fail to attach (e.g., because 1 of 2 dual-DSI controllers aren't
ready), we leave a dangling drm_panel reference to freed memory. Clean
that up on failure.

This problem exists since the driver's introduction, but is especially
relevant after refactored for dual-DSI variants.

Fixes: 14c8f2e9f8ea ("drm/panel: add Innolux P079ZCA panel driver")
Fixes: 7ad4e4636c54 ("drm/panel: p079zca: Refactor panel driver to support multiple panels")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210923173336.2.I9023cf8811a3abf4964ed84eb681721d8bb489d6@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/panel/panel-innolux-p079zca.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
index d92d1c98878c1..df90b66079816 100644
--- a/drivers/gpu/drm/panel/panel-innolux-p079zca.c
+++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
@@ -509,6 +509,7 @@ static void innolux_panel_del(struct innolux_panel *innolux)
static int innolux_panel_probe(struct mipi_dsi_device *dsi)
{
const struct panel_desc *desc;
+ struct innolux_panel *innolux;
int err;

desc = of_device_get_match_data(&dsi->dev);
@@ -520,7 +521,14 @@ static int innolux_panel_probe(struct mipi_dsi_device *dsi)
if (err < 0)
return err;

- return mipi_dsi_attach(dsi);
+ err = mipi_dsi_attach(dsi);
+ if (err < 0) {
+ innolux = mipi_dsi_get_drvdata(dsi);
+ innolux_panel_del(innolux);
+ return err;
+ }
+
+ return 0;
}

static int innolux_panel_remove(struct mipi_dsi_device *dsi)
--
2.34.1