ARM: OMAP2+: powerdomain: avoid testing whether an unsigned char is less than 0

_pwrdm_save_clkdm_state_and_activate() tried to test one of its
unsigned arguments to determine whether it was less than zero.  Fix by
moving the error test to the caller.

Reported-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 8e61d80bf6b3442e658747f7a42cb4f822f973ac..89cad4a605dde7251fa0903bfb58f41e55523b13 100644 (file)
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -52,7 +52,6 @@ enum {
 #define ALREADYACTIVE_SWITCH           0
 #define FORCEWAKEUP_SWITCH             1
 #define LOWPOWERSTATE_SWITCH           2
-#define ERROR_SWITCH                   3
 
 /* pwrdm_list contains all registered struct powerdomains */
 static LIST_HEAD(pwrdm_list);
@@ -233,10 +232,7 @@ static u8 _pwrdm_save_clkdm_state_and_activate(struct powerdomain *pwrdm,
 {
        u8 sleep_switch;
 
-       if (curr_pwrst < 0) {
-               WARN_ON(1);
-               sleep_switch = ERROR_SWITCH;
-       } else if (curr_pwrst < PWRDM_POWER_ON) {
+       if (curr_pwrst < PWRDM_POWER_ON) {
                if (curr_pwrst > pwrst &&
                    pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE &&
                    arch_pwrdm->pwrdm_set_lowpwrstchange) {
@@ -1091,7 +1087,8 @@ int pwrdm_post_transition(struct powerdomain *pwrdm)
  */
 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
 {
-       u8 curr_pwrst, next_pwrst, sleep_switch;
+       u8 next_pwrst, sleep_switch;
+       int curr_pwrst;
        int ret = 0;
        bool hwsup = false;
 
@@ -1107,16 +1104,17 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u8 pwrst)
        pwrdm_lock(pwrdm);
 
        curr_pwrst = pwrdm_read_pwrst(pwrdm);
+       if (curr_pwrst < 0) {
+               ret = -EINVAL;
+               goto osps_out;
+       }
+
        next_pwrst = pwrdm_read_next_pwrst(pwrdm);
        if (curr_pwrst == pwrst && next_pwrst == pwrst)
                goto osps_out;
 
        sleep_switch = _pwrdm_save_clkdm_state_and_activate(pwrdm, curr_pwrst,
                                                            pwrst, &hwsup);
-       if (sleep_switch == ERROR_SWITCH) {
-               ret = -EINVAL;
-               goto osps_out;
-       }
 
        ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
        if (ret)