linux-kernel - [PATCH 4/4] remoteproc: return error for bad "recovery" debugfs input

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Date:   Fri, 28 Feb 2020 12:33:59 -0600
From:   Alex Elder <elder@...aro.org>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>
Cc:     linux-remoteproc@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] remoteproc: return error for bad "recovery" debugfs input

If the value written to the "recovery" debugfs file is not one of
the recognized commands return an error to indicate it's invalid.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/remoteproc/remoteproc_debugfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
index e995dc49c231..0d478bfefd9c 100644
--- a/drivers/remoteproc/remoteproc_debugfs.c
+++ b/drivers/remoteproc/remoteproc_debugfs.c
@@ -146,6 +146,8 @@ rproc_recovery_write(struct file *filp, const char __user *user_buf,
 	} else if (!strncmp(buf, "recover", count)) {
 		/* begin the recovery process without changing the flag */
 		rproc_trigger_recovery(rproc);
+	} else {
+		return -EINVAL;
 	}
 
 	return count;
-- 
2.20.1