[PATCH v3] memory/samsung: reduce protected code area in IRQ

[Bernard Zhao <bernard@vivo.com>]

This change will speed-up a bit this IRQ processing and there
is no need to protect return value or printing.

Signed-off-by: Bernard Zhao <bernard@vivo.com>
---
Changes since v1:
*change release lock before the if statement.
*revert dmc->df->lock mutex lock to protect function
exynos5_dmc_perf_events_check

Changes since v2:
*Improve subject and commit message

Link for V1:
*https://lore.kernel.org/patchwork/patch/1238888/
---
 drivers/memory/samsung/exynos5422-dmc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index 22a43d662833..25196d6268e2 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -1346,15 +1346,13 @@ static irqreturn_t dmc_irq_thread(int irq, void *priv)
 	struct exynos5_dmc *dmc = priv;
 
 	mutex_lock(&dmc->df->lock);
-
 	exynos5_dmc_perf_events_check(dmc);
-
 	res = update_devfreq(dmc->df);
+	mutex_unlock(&dmc->df->lock);
+
 	if (res)
 		dev_warn(dmc->dev, "devfreq failed with %d\n", res);
 
-	mutex_unlock(&dmc->df->lock);
-
 	return IRQ_HANDLED;
 }
 
-- 
2.26.2