[PATCH] memory: samsung: exynos5422-dmc: propagate error from exynos5_counters_get()

From: Marek Szyprowski <m.szyprowski@samsung.com>
To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	Lukasz Luba <lukasz.luba@arm.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	linux-samsung-soc@vger.kernel.org,
	Chanwoo Choi <cw00.choi@samsung.com>
Subject: [PATCH] memory: samsung: exynos5422-dmc: propagate error from exynos5_counters_get()
Date: Tue,  4 Aug 2020 08:12:10 +0200	[thread overview]
Message-ID: <20200804061210.5415-1-m.szyprowski@samsung.com> (raw)
In-Reply-To: CGME20200804061225eucas1p283c1e0dc404bc420a2184480fdfd2b0d@eucas1p2.samsung.com

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@samsung.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

