Documentation/device_model: Fix wrong 'match()' example

sjp38 · dbaluta · commit 2bc21290cc98 · 2021-02-08T21:31:18.000+02:00
'match()' should return non-zero for match success, but the example in
the document is returning non-zero for match failures.  This commit
fixes it.

Signed-off-by: SeongJae Park &lt;sj38.park@gmail.com&gt;
diff --git a/Documentation/teaching/labs/device_model.rst b/Documentation/teaching/labs/device_model.rst
@@ -331,7 +331,7 @@ The functions that will normally be initialized within a bus_type structure are
     // match devices to drivers; just do a simple name test
     static int my_match(struct device *dev, struct device_driver *driver)
     {
-      return strncmp(dev_name(dev), driver->name, strlen(driver->name));
+      return !strncmp(dev_name(dev), driver->name, strlen(driver->name));
     }
 
     // respond to hotplug user events; add environment variable DEV_NAME

Original file line number	Diff line number	Diff line change
`@@ -331,7 +331,7 @@ The functions that will normally be initialized within a bus_type structure are`
`331`	`331`	`// match devices to drivers; just do a simple name test`
`332`	`332`	`static int my_match(struct device dev, struct device_driver driver)`
`333`	`333`	`{`
`334`		`- return strncmp(dev_name(dev), driver->name, strlen(driver->name));`
	`334`	`+ return !strncmp(dev_name(dev), driver->name, strlen(driver->name));`
`335`	`335`	`}`
`336`	`336`
`337`	`337`	`// respond to hotplug user events; add environment variable DEV_NAME`