linux-kernel - [PATCH] memory: samsung: exynos5422-dmc: propagate error from exynos5_counters

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Message-Id: <20200804061210.5415-1-m.szyprowski@samsung.com>
Date:   Tue,  4 Aug 2020 08:12:10 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Lukasz Luba <lukasz.luba@....com>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-samsung-soc@...r.kernel.org,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCH] memory: samsung: exynos5422-dmc: propagate error from
 exynos5_counters_get()

exynos5_counters_get() might fail with -EPROBE_DEFER if the driver for
devfreq event counter is not yet probed. Propagate that error value to
the caller to ensure that the exynos5422-dmc driver will be probed again
when devfreq event contuner is available.

This fixes boot hang if both exynos5422-dmc and exynos-ppmu drivers are
compiled as modules.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
 drivers/memory/samsung/exynos5422-dmc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/memory/samsung/exynos5422-dmc.c b/drivers/memory/samsung/exynos5422-dmc.c
index b9c7956e5031..639811a3eecb 100644
--- a/drivers/memory/samsung/exynos5422-dmc.c
+++ b/drivers/memory/samsung/exynos5422-dmc.c
@@ -914,7 +914,7 @@ static int exynos5_dmc_get_status(struct device *dev,
 	} else {
 		ret = exynos5_counters_get(dmc, &load, &total);
 		if (ret < 0)
-			return -EINVAL;
+			return ret;
 
 		/* To protect from overflow, divide by 1024 */
 		stat->busy_time = load >> 10;
-- 
2.17.1