From: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Thierry Reding
<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Jonathan Hunter
<jonathanh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Laxman Dewangan
<ldewangan-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>,
Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
Cc: linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH v1] i2c: tegra: Make timeout error more informative
Date: Mon, 2 Mar 2020 20:35:12 +0300 [thread overview]
Message-ID: <20200302173512.2743-1-digetx@gmail.com> (raw)
The I2C timeout error message doesn't tell us what exactly failed and some
I2C client drivers do not clarify the error either. Adding WARN_ON_ONCE()
results in a stacktrace being dumped into KMSG, which is very useful for
debugging purposes.
Signed-off-by: Dmitry Osipenko <digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
drivers/i2c/busses/i2c-tegra.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index cbc2ad49043e..b2bb19e05248 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1245,7 +1245,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
tegra_i2c_mask_irq(i2c_dev, int_mask);
- if (time_left == 0) {
+ if (WARN_ON_ONCE(time_left == 0)) {
dev_err(i2c_dev->dev, "i2c transfer timed out\n");
tegra_i2c_init(i2c_dev, true);
return -ETIMEDOUT;
--
2.25.1
next reply other threads:[~2020-03-02 17:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-02 17:35 Dmitry Osipenko [this message]
[not found] ` <20200302173512.2743-1-digetx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-10 11:37 ` [PATCH v1] i2c: tegra: Make timeout error more informative Wolfram Sang
2020-03-10 13:26 ` Dmitry Osipenko
[not found] ` <017aad72-9872-a4aa-dc99-bd7d08c0db14-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-10 18:15 ` Wolfram Sang
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