44 lines
1.4 KiB
Diff
44 lines
1.4 KiB
Diff
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From: Russell King <rmk+kernel@arm.linux.org.uk>
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Subject: [PATCH 01/30] cpuidle: mvebu: indicate failure to enter deeper sleep
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states
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MIME-Version: 1.0
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Content-Disposition: inline
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Content-Transfer-Encoding: 8bit
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Content-Type: text/plain; charset="utf-8"
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The cpuidle ->enter method expects the return value to be the sleep
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state we entered. Returning negative numbers or other codes is not
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permissible since coupled CPU idle was merged.
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At least some of the mvebu_v7_cpu_suspend() implementations return the
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value from cpu_suspend(), which returns zero if the CPU vectors back
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into the kernel via cpu_resume() (the success case), or the non-zero
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return value of the suspend actor, or one (failure cases).
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We do not want to be returning the failure case value back to CPU idle
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as that indicates that we successfully entered one of the deeper idle
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states. Always return zero instead, indicating that we slept for the
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shortest amount of time.
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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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---
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drivers/cpuidle/cpuidle-mvebu-v7.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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--- a/drivers/cpuidle/cpuidle-mvebu-v7.c
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+++ b/drivers/cpuidle/cpuidle-mvebu-v7.c
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@@ -39,8 +39,12 @@ static int mvebu_v7_enter_idle(struct cp
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ret = mvebu_v7_cpu_suspend(deepidle);
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cpu_pm_exit();
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+ /*
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+ * If we failed to enter the desired state, indicate that we
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+ * slept lightly.
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+ */
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if (ret)
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- return ret;
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+ return 0;
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return index;
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}
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