drm/tegra: dc: Fix reference leak in tegra_dc_couple()

driver_find_device() calls get_device() to increment the reference
count once a matching device is found, but there is no put_device() to
balance the reference count. To avoid reference count leakage, add
put_device() to decrease the reference count.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: a31500fe7055 ("drm/tegra: dc: Restore coupling of display controllers")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Acked-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://patch.msgid.link/20251022114720.24937-1-make24@iscas.ac.cn

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 59d5c1ba145a82f62c1835da574867084da98106..6c84bd69b11ff422a21c19b162a3bfb370f63717 100644 (file)
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -3148,6 +3148,7 @@ static int tegra_dc_couple(struct tegra_dc *dc)
                dc->client.parent = &parent->client;
 
                dev_dbg(dc->dev, "coupled to %s\n", dev_name(companion));
+               put_device(companion);
        }
 
        return 0;