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

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Date:   Fri, 17 Apr 2020 14:15:47 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     bjorn.andersson@...aro.org, agross@...nel.org
Cc:     swboyd@...omium.org, mkshah@...eaurora.org,
        Douglas Anderson <dianders@...omium.org>,
        Evan Green <evgreen@...omium.org>,
        Srinivas Rao L <lsrao@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] soc: qcom: rpmh: Dirt can only make you dirtier, not cleaner

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

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>
---

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

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index 3abbb08cd6e1..d1626a1328d7 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -151,10 +151,10 @@ static struct cache_req *cache_rpm_request(struct rpmh_ctrlr *ctrlr,
 		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);
-- 
2.26.1.301.g55bc3eb7cb9-goog