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From: "H. Nikolaus Schaller" <hns@goldelico.com>
To: Evgeniy Polyakov <zbr@ioremap.net>,
	"H. Nikolaus Schaller" <hns@goldelico.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	YueHaibing <yuehaibing@huawei.com>,
	Tony Lindgren <tony@atomide.com>
Cc: linux-kernel@vger.kernel.org, kernel@pyra-handheld.com,
	letux-kernel@openphoenux.org, linux-omap@vger.kernel.org,
	stable@vger.kernel.org
Subject: [PATCH 2/4] w1: omap-hdq: fix return value to be -1 if there is a timeout
Date: Sat, 23 May 2020 19:32:55 +0200	[thread overview]
Message-ID: <b2c2192b461fbb9b8e9bea4ad514a49557a7210b.1590255176.git.hns@goldelico.com> (raw)
In-Reply-To: <cover.1590255176.git.hns@goldelico.com>

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@vger.kernel.org # v5.6+
Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
---
 drivers/w1/masters/omap_hdq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index d363e2a89fdfc4..9f9ec108b189e2 100644
--- 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);
-- 
2.26.2


  parent reply	other threads:[~2020-05-23 17:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-23 17:32 [PATCH 0/4] w1: omap: fix some regressions/bugs (some were introduced in v5.6 but some are older) H. Nikolaus Schaller
2020-05-23 17:32 ` [PATCH 1/4] w1: omap-hdq: cleanup to add missing newline for some dev_dbg H. Nikolaus Schaller
2020-05-23 18:09   ` Tony Lindgren
2020-05-23 17:32 ` H. Nikolaus Schaller [this message]
2020-05-23 18:11   ` [PATCH 2/4] w1: omap-hdq: fix return value to be -1 if there is a timeout Tony Lindgren
2020-05-23 17:32 ` [PATCH 3/4] w1: omap-hdq: fix interrupt handling which did show spurious timeouts H. Nikolaus Schaller
2020-05-27 16:46   ` Tony Lindgren
2020-05-23 17:32 ` [PATCH 4/4] w1: omap-hdq: print dev_err if irq flags are not cleared H. Nikolaus Schaller
2020-05-27 16:46   ` Tony Lindgren

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