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arch/xtensa/xtensa_cpupause.c: Allow a spin before taking the g_cpu_wait

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spinlock.

If we repeatedly call up_cpu_pause and up_cpu_resume, there would be
cases where the next call to up_cpu_pause happens while the other CPU is
still responding to the previous resume request.  In this case the
DEBUGASSERT will trigger.  We should allow the first CPU to wait until the
other CPU has finished responding to the resume request.

Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche 2021-10-15 18:53:05 +02:00 committed by Xiang Xiao
parent 8b67944c75
commit d2bc011719
1 changed files with 4 additions and 2 deletions
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6
arch/xtensa/src/common/xtensa_cpupause.c
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@ -231,10 +231,12 @@ int up_cpu_pause(int cpu)
* handler from returning until up_cpu_resume() is called; g_cpu_paused
* is a handshake that will prevent this function from returning until
* the CPU is actually paused.
* Note that we might spin before getting g_cpu_wait, this just means that
* the other CPU still hasn't finished responding to the previous resume
* request.
*/
DEBUGASSERT(!spin_islocked(&g_cpu_wait[cpu]) &&
!spin_islocked(&g_cpu_paused[cpu]));
DEBUGASSERT(!spin_islocked(&g_cpu_paused[cpu]));
spin_lock(&g_cpu_wait[cpu]);
spin_lock(&g_cpu_paused[cpu]);