[PATCH v2 1/1] iio: adc: qcom-spmi-adc5: Fix the channel name

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: "Jonathan Cameron" <Jonathan.Cameron@huawei.com>,
	"Nuno Sá" <nuno.sa@analog.com>,
	linux-arm-msm@vger.kernel.org, linux-iio@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Jonathan Cameron <jic23@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Marijn Suijten <marijn.suijten@somainline.org>
Subject: [PATCH v2 1/1] iio: adc: qcom-spmi-adc5: Fix the channel name
Date: Wed, 18 Jan 2023 12:06:23 +0200	[thread overview]
Message-ID: <20230118100623.42255-1-andriy.shevchenko@linux.intel.com> (raw)

The node name can contain an address part which is unused
by the driver. Moreover, this string is propagated into
the userspace label, sysfs filenames *and breaking ABI*.

Cut the address part out before assigning the channel name.

Fixes: 4f47a236a23d ("iio: adc: qcom-spmi-adc5: convert to device properties")
Reported-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: rephrased commit message (Marijn), fixed compilation issue (Marijin)
 drivers/iio/adc/qcom-spmi-adc5.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/qcom-spmi-adc5.c b/drivers/iio/adc/qcom-spmi-adc5.c
index e90c299c913a..c2d5e06f137a 100644
--- a/drivers/iio/adc/qcom-spmi-adc5.c
+++ b/drivers/iio/adc/qcom-spmi-adc5.c
@@ -628,12 +628,20 @@ static int adc5_get_fw_channel_data(struct adc5_chip *adc,
 				    struct fwnode_handle *fwnode,
 				    const struct adc5_data *data)
 {
-	const char *name = fwnode_get_name(fwnode), *channel_name;
+	const char *channel_name;
+	char *name;
 	u32 chan, value, varr[2];
 	u32 sid = 0;
 	int ret;
 	struct device *dev = adc->dev;
 
+	name = devm_kasprintf(dev, GFP_KERNEL, "%pfwP", fwnode);
+	if (!name)
+		return -ENOMEM;
+
+	/* Cut the address part */
+	name[strchrnul(name, '@') - name] = '\0';
+
 	ret = fwnode_property_read_u32(fwnode, "reg", &chan);
 	if (ret) {
 		dev_err(dev, "invalid channel number %s\n", name);
-- 
2.39.0

