bus: ti-sysc: Fix sysc_unprepare() when no clocks have been allocated

[ Upstream commit aaa29bb01cc4bf5a87dbdb219efba3b09f259d8e ]

If we return early before ddata->clocks have been allocated we will get a
NULL pointer dereference in sysc_unprepare(). Let's fix this by returning
early when no clocks are allocated.

Fixes: 0eecc636e5a2 ("bus: ti-sysc: Add minimal TI sysc interconnect target driver")
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 2813f9ed57c0d7672beacb3bafee76760d7341c1..54c8c8644df2ec4bf280cdd81df650fa928c6e7e 100644 (file)
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1400,6 +1400,9 @@ static void sysc_unprepare(struct sysc *ddata)
 {
        int i;
 
+       if (!ddata->clocks)
+               return;
+
        for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
                if (!IS_ERR_OR_NULL(ddata->clocks[i]))
                        clk_unprepare(ddata->clocks[i]);