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w1: omap-hdq: fix return value to be -1 if there is a timeout

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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: 27d13da878 ("w1: omap-hdq: Simplify driver with PM runtime autosuspend")
Cc: stable@vger.kernel.org # v5.6+
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Link: https://lore.kernel.org/r/b2c2192b461fbb9b8e9bea4ad514a49557a7210b.1590255176.git.hns@goldelico.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H. Nikolaus Schaller 2020-05-23 19:32:55 +02:00 committed by Greg Kroah-Hartman
parent 5e02f3b317
commit 2d4100632f
1 changed files with 1 additions and 1 deletions
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2
drivers/w1/masters/omap_hdq.c
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@ -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);