[PATCH] ARM: OMAP2+: Variable "reg" in function omap4_dsi_mux_pads() could be uninitialized

[Yizhuo]

In function omap4_dsi_mux_pads(), local variable "reg" could
be uninitialized if function regmap_read() returns -EINVAL.
However, it will be used directly in the later context, which
is potentially unsafe.
Signed-off-by: Yizhuo <yzhai...@ucr.edu>
---
 arch/arm/mach-omap2/display.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
index b3f6eb5d04a2..6e7440ef503a 100644
--- a/arch/arm/mach-omap2/display.c
+++ b/arch/arm/mach-omap2/display.c
@@ -84,6 +84,7 @@ static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
        u32 enable_mask, enable_shift;
        u32 pipd_mask, pipd_shift;
        u32 reg;
+       int ret;
 
        if (dsi_id == 0) {
                enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
@@ -99,7 +100,11 @@ static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
                return -ENODEV;
        }
 
-       regmap_read(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, &reg);
+       ret = regmap_read(omap4_dsi_mux_syscon,
+                                         OMAP4_DSIPHY_SYSCON_OFFSET,
+                                         &reg);
+       if (ret)
+               return ret;
 
        reg &= ~enable_mask;
        reg &= ~pipd_mask;
-- 
2.17.1