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From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     bjorn.andersson@linaro.org, ohad@wizery.com
Cc:     linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 01/13] remoteproc: Re-check state in rproc_shutdown()
Date:   Wed, 26 Aug 2020 10:45:17 -0600
Message-Id: <20200826164529.224476-2-mathieu.poirier@linaro.org>
In-Reply-To: <20200826164529.224476-1-mathieu.poirier@linaro.org>
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The state of the remote processor may have changed between the
time a call to rproc_shutdown() was made and the time it is
executed.  To avoid moving forward with an operation that may
have been cancelled, recheck while holding the mutex.

Cc: <stable@vger.kernel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 drivers/remoteproc/remoteproc_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 7f90eeea67e2..fb2632cbd2df 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1834,6 +1834,9 @@ void rproc_shutdown(struct rproc *rproc)
 		return;
 	}
 
+	if (rproc->state != RPROC_RUNNING)
+		goto out;
+
 	/* if the remote proc is still needed, bail out */
 	if (!atomic_dec_and_test(&rproc->power))
 		goto out;
-- 
2.25.1