[PATCH] drm/bridge: ti-sn65dsi83: Fix null pointer dereference in remove callback

[Jonathan Liu]

If attach has not been called, unloading the driver can result in a null
pointer dereference in mipi_dsi_detach as ctx->dsi has not been assigned
yet.

Fixes: ceb515ba29ba6b ("drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and 
SN65DSI84 driver")
Signed-off-by: Jonathan Liu <net...@gmail.com>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c 
b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index 750f2172ef08..8e9f45c5c7c1 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -671,8 +671,11 @@ static int sn65dsi83_remove(struct i2c_client *client)
 {
        struct sn65dsi83 *ctx = i2c_get_clientdata(client);
 
-       mipi_dsi_detach(ctx->dsi);
-       mipi_dsi_device_unregister(ctx->dsi);
+       if (ctx->dsi) {
+               mipi_dsi_detach(ctx->dsi);
+               mipi_dsi_device_unregister(ctx->dsi);
+       }
+
        drm_bridge_remove(&ctx->bridge);
        of_node_put(ctx->host_node);
 
-- 
2.32.0