TMS320F28386D: driverlib_cm/ethernet.c compiler warning on newPktPtr in Ethernet_retrieveRxPacket

Part Number: TMS320F28386D
Other Parts Discussed in Thread: C2000WARE

Dear support team,

In an attempt to make my build free of compiler warnings, I have one warning left in the driverlib_cm, regarding variable 'newPktPtr' being set but not referenced.

Environment

• CCS 21.0.0.14__1.12.0
• C2000Ware 26.01.00.00
• Compiler ti-cgt-arm_20.2.7.LTS
• Device F2838x

Issue

• File: driverlib/f2838x/driverlib_cm/ethernet.c line 2813
• Warning: #552-D: variable "newPktPtr" was set but never used
• Function: Ethernet_retrieveRxPacket(..,..)

Analysis

Under certain conditions the Rx packet that is returned by the function is first handed to the application via a callback function. The "newPktPtr" is the returned result of that callback function, but after the assignment without further use.

The Ethernet_retrieveRxPacket function always returns the "pktPtr" with the packet popped from the queue.

Depending on the intention / requirements of this API, either:

• the "newPktPtr" should be returned (then this issue is a bug);
• or the returned "newPktPtr" is indeed of no use (and the warning can be suppressed by replacing "newPktPtr" with a cast to void or similar).

Since I am not familiar with the details of this API, I leave further analysis to you. Obviously, there is no rush on my side regarding this issue.

Regards,
Ernst