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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hans Verkuil <hverkuil@xs4all.nl>,
        Helen Koike <helen.koike@collabora.com>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 256/276] media: vimc: stream: fix thread state before sleep
Date:   Wed, 29 May 2019 20:06:54 -0700
Message-Id: <20190530030541.173404684@linuxfoundation.org>
In-Reply-To: <20190530030523.133519668@linuxfoundation.org>
References: <20190530030523.133519668@linuxfoundation.org>
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[ Upstream commit 2978a505aaa981b279ef359f74ba93d25098e0a0 ]

The state TASK_UNINTERRUPTIBLE should be set just before
schedule_timeout() call, so it knows the sleep mode it should enter.
There is no point in setting TASK_UNINTERRUPTIBLE at the initialization
of the thread as schedule_timeout() will set the state back to
TASK_RUNNING.

This fixes a warning in __might_sleep() call, as it's expecting the
task to be in TASK_RUNNING state just before changing the state to
a sleeping state.

Reported-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/platform/vimc/vimc-streamer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/vimc/vimc-streamer.c b/drivers/media/platform/vimc/vimc-streamer.c
index fcc897fb247bc..392754c18046c 100644
--- a/drivers/media/platform/vimc/vimc-streamer.c
+++ b/drivers/media/platform/vimc/vimc-streamer.c
@@ -120,7 +120,6 @@ static int vimc_streamer_thread(void *data)
 	int i;
 
 	set_freezable();
-	set_current_state(TASK_UNINTERRUPTIBLE);
 
 	for (;;) {
 		try_to_freeze();
@@ -137,6 +136,7 @@ static int vimc_streamer_thread(void *data)
 				break;
 		}
 		//wait for 60hz
+		set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(HZ / 60);
 	}
 
-- 
2.20.1