Fix zero-division error in STM stmmac tc driver

From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Vulnerability Type: Zero-division error. - Trigger Condition: When tc-cbs (traffic control) is disabled, and offload is also disabled, the speed divider needs to be calculated. - Impact: When tc-cbs is disabled, idleslope, sendslope, and credit values are no longer required to be configured. Therefore, adding a return statement when setting txQ mode to DCB (Data Center Bridging) can prevent the zero-division error. 2. Fix Measures: - Fix Code: Add a return statement when setting txQ mode to DCB. - Fix File: . 3. Fix Details: - Fix Code Location: In the file , specifically at lines -386,6 +386,7. - Fix Code Content: 4. Fix History: - Commit ID: . - Commit Date: September 18, 2024. - Committer: KhaiWenTan. - Commit Message: Fix zero-division error issue. 5. Related Patch: - Patch ID: . - Patch Description: No need to calculate speed divider when offload is disabled. 6. Review and Sign-off: - Reviewer: Simon Horman. - Sign-offs: KhaiWenTan, Choong Yong Liang. This information provides a detailed overview of the vulnerability’s trigger conditions, fix implementation, and associated review and sign-off processes, aiding in understanding the repair process and technical details.

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Fix zero-division error in STM stmmac tc driver