Re: [v5 01/12] struct device: Add function callback durable_name

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On 25.09.2020 19:19, Tony Asleson wrote:

Function callback and function to be used to write a persistent
durable name to the supplied character buffer.  This will be used to add
structured key-value data to log messages for hardware related errors
which allows end users to correlate message and specific hardware.

Signed-off-by: Tony Asleson <tasleson@xxxxxxxxxx>
---
  drivers/base/core.c    | 24 ++++++++++++++++++++++++
  include/linux/device.h |  4 ++++
  2 files changed, 28 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 05d414e9e8a4..88696ade8bfc 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2489,6 +2489,30 @@ int dev_set_name(struct device *dev, const char *fmt, ...)
  }
  EXPORT_SYMBOL_GPL(dev_set_name);
+/**
+ * dev_durable_name - Write "DURABLE_NAME"=<durable name> in buffer
+ * @dev: device
+ * @buffer: character buffer to write results
+ * @len: length of buffer
+ * @return: Number of bytes written to buffer

   This is not how the kernel-doc commenta describe the function result, IIRC...

+ */
+int dev_durable_name(const struct device *dev, char *buffer, size_t len)
+{
+	int tmp, dlen;
+
+	if (dev && dev->durable_name) {
+		tmp = snprintf(buffer, len, "DURABLE_NAME=");
+		if (tmp < len) {
+			dlen = dev->durable_name(dev, buffer + tmp,
+							len - tmp);
+			if (dlen > 0 && ((dlen + tmp) < len))
+				return dlen + tmp;
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_durable_name);
+
  /**
   * device_to_dev_kobj - select a /sys/dev/ directory for the device
   * @dev: device
[...]

MBR, Sergei



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