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target/openrisc: Remove dead code attempting to check "is timer disabled" 

In the mtspr helper we attempt to check for "is the timer disabled"
with "if (env->ttmr & TIMER_NONE)".  This is wrong because TIMER_NONE
is zero and the condition is always false (Coverity complains about
the dead code.)

The correct check would be to test whether the TTMR_M field in the
register is equal to TIMER_NONE instead.  However, the
cpu_openrisc_timer_update() function checks whether the timer is
enabled (it looks at cpu->env.is_counting, which is set to 0 via
cpu_openrisc_count_stop() when the TTMR_M field is set to
TIMER_NONE), so there's no need to check for "timer disabled" in the
target/openrisc code.  Instead, simply remove the dead code.

Fixes: Coverity CID 1005812
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Stafford Horne <shorne@gmail.com>
Message-id: 20201103114654.18540-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-11-17 12:56:32 +00:00
parent 019294db68
commit 7b0263cb14
1 changed files with 0 additions and 3 deletions
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3
target/openrisc/sys_helper.c
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@ -176,9 +176,6 @@ void HELPER(mtspr)(CPUOpenRISCState *env, target_ulong spr, target_ulong rb)
case TO_SPR(10, 1): /* TTCR */
cpu_openrisc_count_set(cpu, rb);
if (env->ttmr & TIMER_NONE) {
return;
}
cpu_openrisc_timer_update(cpu);
break;
#endif