linux-kernel - [PATCH 5.7 368/376] w1: omap-hdq: fix return value to be -1 if there is a timeout

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Date:   Fri, 19 Jun 2020 16:34:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tony Lindgren <tony@...mide.com>,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: [PATCH 5.7 368/376] w1: omap-hdq: fix return value to be -1 if there is a timeout

From: H. Nikolaus Schaller <hns@...delico.com>

commit 2d4100632fa1947bf3e8d7a091e94e2cf21923af upstream.

omap_w1_read_byte() should return -1 (or 0xff) in case of
error (e.g. missing battery).

The code accidentially overwrites the variable ret and not val,
which is returned. So it will return the initial value 0 instead
of -1.

Fixes: 27d13da8782a ("w1: omap-hdq: Simplify driver with PM runtime autosuspend")
Cc: stable@...r.kernel.org # v5.6+
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
Link: https://lore.kernel.org/r/b2c2192b461fbb9b8e9bea4ad514a49557a7210b.1590255176.git.hns@goldelico.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/w1/masters/omap_hdq.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -464,7 +464,7 @@ static u8 omap_w1_read_byte(void *_hdq)

 	ret = hdq_read_byte(hdq_data, &val);
 	if (ret)
-		ret = -1;
+		val = -1;

 	pm_runtime_mark_last_busy(hdq_data->dev);
 	pm_runtime_put_autosuspend(hdq_data->dev);