media: camss-vfe: always initialize reg at vfe_set_xbar_cfg()

if output->wm_num is bigger than 2, the value for reg is
not initialized, as warned by smatch:
	drivers/media/platform/qcom/camss-8x16/camss-vfe.c:633 vfe_set_xbar_cfg() error: uninitialized symbol 'reg'.
	drivers/media/platform/qcom/camss-8x16/camss-vfe.c:637 vfe_set_xbar_cfg() error: uninitialized symbol 'reg'.

That shouldn't happen in practice, so add a logic that will
break the loop if i > 1, fixing the warnings.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Acked-by: Todor Tomov <todor.tomov@linaro.org>

diff --git a/drivers/media/platform/qcom/camss-8x16/camss-vfe.c b/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
index b22d2dfcd3c29ec85c474948f67d0805571db3ab..55232a9129503e3dda670a3821d0a0f6390a6f2c 100644 (file)
--- a/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss-8x16/camss-vfe.c
@@ -622,6 +622,9 @@ static void vfe_set_xbar_cfg(struct vfe_device *vfe, struct vfe_output *output,
                        reg = VFE_0_BUS_XBAR_CFG_x_M_PAIR_STREAM_EN;
                        if (p == V4L2_PIX_FMT_NV12 || p == V4L2_PIX_FMT_NV16)
                                reg |= VFE_0_BUS_XBAR_CFG_x_M_PAIR_STREAM_SWAP_INTER_INTRA;
+               } else {
+                       /* On current devices output->wm_num is always <= 2 */
+                       break;
                }
 
                if (output->wm_idx[i] % 2 == 1)