linux-kernel - [PATCH 4.19 01/86] soc: qcom: rpmh: Dirt can only make you dirtier, not cleaner

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Date:   Mon, 27 Jul 2020 16:03:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Maulik Shah <mkshah@...eaurora.org>
Subject: [PATCH 4.19 01/86] soc: qcom: rpmh: Dirt can only make you dirtier, not cleaner

From: Douglas Anderson <dianders@...omium.org>

commit 35bb4b22f606c0cc8eedf567313adc18161b1af4 upstream.

Adding an item into the cache should never be able to make the cache
cleaner.  Use "|=" rather than "=" to update the dirty flag.

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Reviewed-by: Maulik Shah <mkshah@...eaurora.org> Thanks, Maulik
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Fixes: bb7000677a1b ("soc: qcom: rpmh: Update dirty flag only when data changes")
Reported-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
Link: https://lore.kernel.org/r/20200417141531.1.Ia4b74158497213eabad7c3d474c50bfccb3f342e@changeid
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/soc/qcom/rpmh.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -150,10 +150,10 @@ existing:
 		break;
 	}
 
-	ctrlr->dirty = (req->sleep_val != old_sleep_val ||
-			req->wake_val != old_wake_val) &&
-			req->sleep_val != UINT_MAX &&
-			req->wake_val != UINT_MAX;
+	ctrlr->dirty |= (req->sleep_val != old_sleep_val ||
+			 req->wake_val != old_wake_val) &&
+			 req->sleep_val != UINT_MAX &&
+			 req->wake_val != UINT_MAX;
 
 unlock:
 	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);