[PATCH 2/4] can: fix IFF_ECHO example in documentation

The documentation suggests doing:

  dev->flags = (IFF_NOARP | IFF_ECHO);

to set the IFF_ECHO flag. This is problematic because by doing so,
other potentially enabled flags would be overwritten. Furthermore,
none of the drivers do it like that.

Replace the example by:

  dev->flags |= IFF_ECHO;

which is more robust and consistent with what all the drivers are doing.

Signed-off-by: Vincent Mailhol <[email protected]>
---
 Documentation/networking/can.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/networking/can.rst b/Documentation/networking/can.rst
index 536ff411da1d..fbd0d501ea4e 100644
--- a/Documentation/networking/can.rst
+++ b/Documentation/networking/can.rst
@@ -1126,7 +1126,7 @@ e.g. of tty devices. In this case the driver flag IFF_ECHO has to be
 set to prevent the PF_CAN core from locally echoing sent frames
 (aka loopback) as fallback solution::
 
-    dev->flags = (IFF_NOARP | IFF_ECHO);
+    dev->flags |= IFF_ECHO;
 
 
 CAN Controller Hardware Filters

-- 
2.54.0