[media] V4L: sh_mobile_csi2: fix unbalanced pm_runtime_put()

If the sh_mobile_csi2 driver didn't attach to a client, normally, because
the respective device connects to the SoC over the parallel CEU interface
and doesn't use the CSI-2 controller, it also shouldn't call
pm_runtime_put() on attempted disconnect.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/sh_mobile_csi2.c b/drivers/media/video/sh_mobile_csi2.c
index 91c680a72849..37706eb81f25 100644
--- a/drivers/media/video/sh_mobile_csi2.c
+++ b/drivers/media/video/sh_mobile_csi2.c
@@ -208,6 +208,9 @@ static int sh_csi2_client_connect(struct sh_csi2 *priv)
         unsigned long common_flags, csi2_flags;
         int i, ret;
 
+        if (priv->client)
+                return -EBUSY;
+
         for (i = 0; i < pdata->num_clients; i++)
                 if (&pdata->clients[i].pdev->dev == icd->pdev)
                         break;
@@ -262,6 +265,9 @@ static int sh_csi2_client_connect(struct sh_csi2 *priv)
 
 static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
 {
+        if (!priv->client)
+                return;
+
         priv->client = NULL;
 
         pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));