This is a note to let you know that I've just added the patch titled
iio: dac: mcp4725: Fix i2c_master_send() return value handling
to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 09d3bec7009186bdba77039df01e5834788b3f95 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@xxxxxxx>
Date: Thu, 11 May 2023 02:43:30 +0200
Subject: iio: dac: mcp4725: Fix i2c_master_send() return value handling
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
The i2c_master_send() returns number of sent bytes on success,
or negative on error. The suspend/resume callbacks expect zero
on success and non-zero on error. Adapt the return value of the
i2c_master_send() to the expectation of the suspend and resume
callbacks, including proper validation of the return value.
Fixes: cf35ad61aca2 ("iio: add mcp4725 I2C DAC driver")
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230511004330.206942-1-marex@xxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
drivers/iio/dac/mcp4725.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/dac/mcp4725.c b/drivers/iio/dac/mcp4725.c
index 46bf758760f8..3f5661a3718f 100644
--- a/drivers/iio/dac/mcp4725.c
+++ b/drivers/iio/dac/mcp4725.c
@@ -47,12 +47,18 @@ static int mcp4725_suspend(struct device *dev)
struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
u8 outbuf[2];
+ int ret;
outbuf[0] = (data->powerdown_mode + 1) << 4;
outbuf[1] = 0;
data->powerdown = true;
- return i2c_master_send(data->client, outbuf, 2);
+ ret = i2c_master_send(data->client, outbuf, 2);
+ if (ret < 0)
+ return ret;
+ else if (ret != 2)
+ return -EIO;
+ return 0;
}
static int mcp4725_resume(struct device *dev)
@@ -60,13 +66,19 @@ static int mcp4725_resume(struct device *dev)
struct mcp4725_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
u8 outbuf[2];
+ int ret;
/* restore previous DAC value */
outbuf[0] = (data->dac_value >> 8) & 0xf;
outbuf[1] = data->dac_value & 0xff;
data->powerdown = false;
- return i2c_master_send(data->client, outbuf, 2);
+ ret = i2c_master_send(data->client, outbuf, 2);
+ if (ret < 0)
+ return ret;
+ else if (ret != 2)
+ return -EIO;
+ return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend,
mcp4725_resume);
--
2.40.1
