pass-hal: tm2: Prevent attempt to turn off CPU0

This patch prevents the attempt to turn off CPU0
because TM2 uses the Exynos5433 SoC which doesn't
permit to turn off the CPU0 due to the h/w design
issue.

Change-Id: I6795aad5ff80c1728db42bc808bac8806d5daa76
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

diff --git a/src/cpu/cpu.c b/src/cpu/cpu.c
index 83bdde0..c837688 100644 (file)
--- a/src/cpu/cpu.c
+++ b/src/cpu/cpu.c
@@ -271,7 +271,6 @@ static int tm2_hotplug_set_online_state(char *res_name, int cpu, int on)
        char path[PATH_MAX];
        int ret;
 
-
        if ((!res_name))
                return -EINVAL;
        if ((cpu < TM2_CPU_MIN_NUM) || (cpu > TM2_CPU_MAX_NUM))
@@ -279,7 +278,16 @@ static int tm2_hotplug_set_online_state(char *res_name, int cpu, int on)
        if ((on != CPU_ONLINE_STATE_ON) && (on != CPU_ONLINE_STATE_OFF))
                return -EINVAL;
 
-       /* TODO: Can we turn off CPU0? */
+       /*
+         * NOTE: Exynos SoC series cannot turn off the CPU0
+        * because of h/w design. To prevent the critical problem,
+        * if someone try to turn off the CPU0, just return without any
+        * opertaion.
+        */
+       if (on == 0 && cpu == 0) {
+               _E("cannot turn off the CPU0");
+               return 0;
+       }
 
        snprintf(path, PATH_MAX, "%s%d%s",
                CPU_ONLINE_PATH_PREFIX,