linux-kernel - [PATCH 3.10 188/319] hwrng: omap - Only fail if pm_runtime_get

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Message-Id: <1486322541-8206-89-git-send-email-w@1wt.eu>
Date:   Sun,  5 Feb 2017 20:20:10 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Dave Gerlach <d-gerlach@...com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 188/319] hwrng: omap - Only fail if pm_runtime_get_sync returns < 0

From: Dave Gerlach <d-gerlach@...com>

commit ad8529fde9e3601180a839867a8ab041109aebb5 upstream.

Currently omap-rng checks the return value of pm_runtime_get_sync and
reports failure if anything is returned, however it should be checking
if ret < 0 as pm_runtime_get_sync return 0 on success but also can return
1 if the device was already active which is not a failure case. Only
values < 0 are actual failures.

Fixes: 61dc0a446e5d ("hwrng: omap - Fix assumption that runtime_get_sync will always succeed")
Signed-off-by: Dave Gerlach <d-gerlach@...com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/char/hw_random/omap-rng.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/hw_random/omap-rng.c b/drivers/char/hw_random/omap-rng.c
index 52aebbe..2798fb1 100644
--- a/drivers/char/hw_random/omap-rng.c
+++ b/drivers/char/hw_random/omap-rng.c
@@ -128,7 +128,7 @@ static int omap_rng_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(&pdev->dev);
 	ret = pm_runtime_get_sync(&pdev->dev);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret);
 		pm_runtime_put_noidle(&pdev->dev);
 		goto err_ioremap;
@@ -190,7 +190,7 @@ static int omap_rng_resume(struct device *dev)
 	int ret;
 
 	ret = pm_runtime_get_sync(dev);
-	if (ret) {
+	if (ret < 0) {
 		dev_err(dev, "Failed to runtime_get device: %d\n", ret);
 		pm_runtime_put_noidle(dev);
 		return ret;
-- 
2.8.0.rc2.1.gbe9624a